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Saddleback Caterpillar Acharia stimulea (Clemens) (Insecta: Lepidoptera: Limacodidae)
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Title: Saddleback Caterpillar Acharia stimulea (Clemens) (Insecta: Lepidoptera: Limacodidae)
Series Title: Featured Creatures
Physical Description: Fact Sheet
Creator: Bibbs, Christopher S
Frank, J. H (John Howard), 1942-
Publisher: University of Florida Cooperative Extension Service, Institute of Food and Agriculture Sciences, EDIS
Place of Publication: Gainesville, Fla.
Publication Date: 2012
 Notes
Abstract: Acharia stimulea is best known as a medically significant species. Its spines are strong, acutely pointed, and hollow. They embed deeply into tissue and break off, and can interrupt healing as the protoplasm from the venom glands dries into the tissue area. The venom itself can cause a systemic condition called erucism or acute urticaria, for which severe symptoms may include migraines, gastrointestinal symptoms, asthma complications, anaphylactic shock, rupturing of erythrocytes, and hemorrhaging.
Acquisition: Collected for University of Florida's Institutional Repository by the UFIR Self-Submittal tool. Submitted by Diana Hagan.
Publication Status: Published
General Note: "Publication #EENY-522"
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Source Institution: University of Florida Institutional Repository
Holding Location: University of Florida
Rights Management: All rights reserved by the submitter.
System ID: IR00000865:00001

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EENY-522 Saddleback Caterpillar Acharia stimulea (Clemens) (Insecta: Lepidoptera: Limacodidae)1Christopher S. Bibbs and J. Howard Frank2 1. This document is EENY-522, one of a series of the Entomology and Nematology Department, Florida Cooperative Extension Service, Institute of Food and A gricultural Sciences, University of Florida. Original publication date March 2012. Visit the EDIS website at http://edis.ifas.u.edu 2. Christ opher S. Bibbs and J. Howard Frank, professors Entomology and Nematology Department, University of Florida, Gainesville, Fl 32611.The Institute of Food and Agricultural Sciences (IFAS) is an Equal Opportunity Institution authorized to provide research, educational information and other services only to individuals and institutions that function with non-discrimination with respect to race, creed, color, religion, age, disability, sex, sexual orientation, marital status, national origin, political opinions or aliations. U.S. Department of Agriculture, Cooperative Extension Service, University of Florida, IFAS, Florida A&M University Cooperative Extension Program, and Boards of County Commissioners Cooperating. Millie Ferrer-Chancy, Interim DeanIntroductionAcharia stimulea (Clemens) is a limacodid moth, or slug moth, best known for its larval growth phase. Distinct bright color patterns and the presence of venomous, urticating spines lead to its recognition as the saddleback caterpillar. It is native to a large range in the eastern United States and able to feed on a wide array of host plant species. is species can survive well in northern temperate areas and warmer southern climates. e saddleback caterpillar is encountered most frequently as a medically signicant pest, and has minor eects in landscaping and agriculture. SynonymyEmpretia stimulea Clemens Limacodes ephippiatus Harris Sibine stimulea (Clemens) Acharia stimulea (Clemens) (Dyar and Morton 1896) DistributionAcharia stimulea has a wide range in the eastern United States, occurring as far southward as Florida, northward to New York and Massachusetts, and westward to Texas, Indiana and Kansas (Snow 1875, Darlington 1952, Niesenbaum 1992, Landau and Prowell 1999, Hepner 2003, Covell 2005, Wagner 2005). Figure 1. Mature larvae of the saddleback caterpillar, Acharia stimulea (Clemens). Credits: Lyle J. Buss, University of Florida Figure 2. State level distribution of Acharia stimulea (Clemens) in United States.

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2 DescriptionAdultsAcharia stimulea adults are glossy dark brown in color with black shading. Dense scales are present on the body and wings, giving it a furry appearance. Wing span ranges from 26 mm (1.0.7 in), with females typically larger in size than males. A single white dot is present near the forewing base. Near the forewing apex, one to three additional white dots are present. e hind wings will be a paler brown than the forewings.EggsClutches are laid on the upperside of host plant leaves in irregular clusters of thirty to y eggs. e eggs are sometimes laid to partially overlap each other. Individual eggs are yellow and transparent, with scale-like characteristics and thin edges. Length ranges from 1.5.0 mm (0.06.08 in) and width averages 1 mm (0.04 in). No additional markings are present.Larvaee caterpillars have a truncated, slug-like body form that is not typical of other Lepidoptera families. e prolegs are concealed under the ventral surface of the body. Color patterns are aposematic, or having bright warning colors that denote toxicity or distastefulness. e caterpillars are dark brown on the anterior and posterior ends with a contrasting bright green pattern blanketing the dorsal midsection. is green section is bordered with white markings that outline a saddle-like shape. e skin has a granulated texture, and large eshy tubercles extend from both anterior and posterior ends. Each tubercle is covered in long setae and a complex of varied urticating spines embedded among the setae. A variable marking occurs at the posterior end where a cream colored set of spots imitates a large facial area. Figure 3. Adult stage of the saddleback caterpillar, Acharia stimulea (Clemens), showing the white dots on the wings. Credits: Lyle J. Buss, University of Florida Figure 4. Late instar larva of the saddleback caterpillar, Acharia stimulea (Clemens) larva, on blueberry. Credits: Lyle J. Buss, University of Florida Figure 5. Close up of urticating spines of the saddleback caterpillar, Acharia stimulea (Clemens) larva, on blueberry. Credits: Lyle J. Buss, University of Florida

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3 At hatching, larvae can be as small as 1.2 mm (0.05 in) and during last instar the larvae can be as large as 20 mm (0.8 in) with a 7 mm (0.28 in) width. Early instars lack dened aposematic coloration, but still have the stout body design and eshy tubercles shown by later instars. Middle instars begin to develop the well dened markings of the species and the enlarged spinal processes. PupaeLarvae spin compact, silk cocoons roughly half the size of the last instar. e cocoon is then hardened to protect the pupa contained within. A cocoon from which an adult has emerged will have a circular exit hole as if a hatch has opened. is cocoon design is typical of Limacodidae as a family, and not specic to A. stimulea. Figure 6. Close up the startle display marking of the saddleback caterpillar, Acharia stimulea (Clemens). Credits: Lyle J. Buss, University of Florida Figure 7. Early instar larvae of the saddleback caterpillar, Acharia stimulea (Clemens). Credits: Lyle J. Buss, University of Florida Figure 8. Middle instar larvae of the saddleback caterpillar, Acharia stimulea (Clemens). Credits: Lyle J. Buss, University of Florida Figure 9. Cocoon of the saddleback caterpillar, Acharia stimulea (Clemens). Credits: Photograph by: Pennsylvania Department of Conservation and Natural Resources; Bugwood.org

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4 Life Cycle and Biologye transparent eggs reveal the small larvae of A. stimulea, which are observed curled inside with anterior and posterior ends touching (Dyar and Morton 1896, Epstein 1996 Wagner 2005). Aer ten days, the minute larva will chew itself free from the egg, creating a small exit hole (Dyar and Morton 1896). Larvae need approximately four to ve months to feed and develop before pupating (Dyar and Morton 1896, Hossler 2010). e rst instars lack the aposematic colors or startle display markings that complement their spine defenses. Hatchlings will feed gregariously on a single leaf until advancement to the next growth stage. e second through penultimate instars acquire brown colorations on the anterior and posterior ends, and develop the bright green saddle markings on the midsection. Although still small at 5 mm (0.2.3 in) in length, they acquire urticating spines on the eshy tubercles of the body as early as the second instar. e spinal processes continue to develop and eshy horns become apparent on the anterior and posterior ends, which function as the primary location of defensive spines. e second to fourth instars feed indiscriminately on the upper or under sides of a host plant leaf, and feed on plant tissue between leaf veins while avoiding the leaf veins themselves; this creates visual dark patches (or windows) (Packard 1893, Dyar and Morton 1896). e last instars engorge themselves and reach lengths of approximately 20 mm (0.8 in) with a 7 mm (0.28 in) width. is fully fed stage has noticeably enlarged anterior and posterior ends, with well developed spinal processes and several eshy horns. e last instars feed on the entire leaf, consuming veins, under side, and upper side regardless of feeding orientation on the leaf (Dyar and Morton 1986). Saddleback caterpillars have modied prolegs where instead of crochets, which hook into materials and surfaces to provide support, the limacodids have suckers (Epstein 1996). Larvae also secrete a semi-uid silk from their ventral pores as they move. is helps increase body contact with their substrate and provides an adhesive bond, especially to smooth surfaces like those of palm plant leaves (Epstein 1996, Howard et al. 2001). is locomotive complex gives the family its designation as slug caterpillars because of their gliding movement pattern (Epstein 1996). When on the verge of pupation, limacodid caterpillars expel chalky white frass pellets (Epstein 1996). Fluid is also expelled from the body to reduce the body volume to approximately one half the size of the fully fed larva, at which point the color dulls and pigment is lost (McNaulty 1967). e expelled uids help compress setae and spines to aid in compaction (Epstein 1996). e silk layer is modied with a circular weakened area at one end (Epstein 1996). is weakened area is not visible before eclosion, and forms a hatch that ejects when pressure is applied by the pupa (Dyar and Morton 1896, Common 1990, Schremmer 1990, Epstein 1996). Despite defensive measures in the cocoon, predation on the pupae accounts for a signicant level of mortality in A. stimulea (Murphy and Lill 2010). Caterpillars in temperate areas will overwinter as pupae (USAF 1982, Epstein 1996; Murphy and Lill 2010). Adults emerge for mating ights in June and July in far northeastern states (Dyar and Morton 1896, USAF 1982), which translates into expected emergences closer to February and March in warmer climate zones as in Texas and Figure 10. Example of middle instar saddleback caterpillars, Acharia stimulea (Clemens), feeding in windows on underside of leaf. Credits: Lyle J. Buss, University of Florida Figure 11. Last instar saddleback caterpillar, Acharia stimulea (Clemens), feeding on whole leaf. Credits: Lyle J. Buss, University of Florida

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5 Florida. Males y rst in the twilight hours of warm nights, with females following during the night hours; successful couplings will stay in copulatory attachment for up to 24 hours (Dyar and Morton 1896). Adults have a single brood, with oviposition occurring at night. Acharia stimulea is polyphagous, especially on deciduous trees (Scott 1964).HostsWhat host plant this insect is found on is not a relevant means of identifying A. stimulea because of its polyphagous nature. e following list indicates known hosts: Aceraceae: Acer spp., maple Adoxaceae: Viburnum spp. Anacardiaceae: Schinus terebinthifoilus Brazilian peppertree Aquifoliaceae: Ilex cornuta holly Araceae: Anthurium andraeanum amingo ower; Epipremnum spp., pothos vine; Philodendron selloum Arecaceae: Areca spp., single stemmed palms; Archonto phoenix alexandrae, Alexander palm; Adonidia merrilli, Christmas palm; Caryota mitis shtail palm; Chamaedorea spp.; Cocos nucifera, coconut palm; Dictyosperma album princess palm; Dypsis lutescens, buttery palm; Nannor rhops ritchiana mazari palm; Phoenix canariensis, Canary Island date palm; Phoenix roebeleni pygmy date palm; Syagrus romanzoanum queen palm; Washingtonia robusta Mexican fan palm Asparagaceae: Beaucarnea recurvata ponytail palm; Cordyline terminalis cabbage tree; Dracaena deremensis, green dracaena; D. fragrans cornstalk dracaena; D. mar ginata dragon tree Asteraceae: Aster spp.; Helianthus spp., sunower and artichoke Bignoniaceae: Tabebuia aurea Caribbean trumpet tree; T. umbellata Ip Cannabaceae: Celtis spp., hackberry Cannaceae: Canna indica Indian shot Cornaceae: Cornus spp., dogwood Cycadaceae: Cycas revoluta cycad, sago palm Ericaceae: Vaccinium spp., blueberry, cranberry, huckleberry, lingonberry Euphorbiaceae: Acalypha wilkesiana ; Codiaeum spp. Fabaceae: Wisteria spp. Fagaceae: Castanea spp., chestnut; Quercus spp., oak Hydrangeaceae: Hydrangea spp. Iridaceae: Gladiolus spp. Juglandaceae: Carya illinoinensis pecan Lauraceae: Lindera benzoin, spicebush Leeaceae: Leea coccinea Lythraceae: Lagerstroemia indica crape myrtle Malpighiaceae: Malpighia glabra Barbados cherry Malvaceae: Hibiscus rosa-sinensis, Chinese hibiscus; H. syriacus rose of Sharon; Malvaviscus spp., wax mallow; Tilia spp., basswood Meliaceae: Swietenia mahogani, West Indies mahogany Moraceae: Ficus elastica rubber g Myrtaceae: Eucalyptus spp.; Feijoa sellowiana pineapple guava; Melaleuca quinquenervia broad leaved paperbark; Psidium cattleianum strawberry guava; Syzygium spp., brush cherry Orchiaceae: Cattleya spp., orchid; Chysis bractescens; Cyrtopodium punctatum cyrt; Dendrobium nobile noble dendrobium; Epidendrum tampense; Spathoglottis plicata, large purple orchid Poaceae: Zea mays, sweet corn Podocarpaceae: Podocarpus spp. Polygonaceae: Antigonon leptopus coral vine; Coccoloba uvifera seagrape Proteaceae: Macadamia tetraphylla macadamia nut Rosaceae: Eriobotrya japonica loquat; Malus pumila common apple; M. sylvestris crabapple; Photinia spp.; Prunus serotina black cherry; Pyrus spp., pear; Rosa spp., rose

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6 Rubiaceae: Coea arabica mountain coee; Gardenia spp.; Ixora coccinea jungle geranium Rutaceae: Citrus aurantium bitter orange; C. limonia rangpur; C. paradisi, grapefruit; C. sinensis, sweet orange; Fortunella spp., kumquat Sapindaceae: Litchi chinensis, lychee or litchi Sapotaceae: Pouteria campechiana canistel; Sideroxylon lanuginosum false buckthorn Strelitziaceae: Strelitzia nicolai great white bird of paradise Ulmaceae: Ulmus spp., elm Vitaceae: Vitis spp. grapevine (List compiled using Snow 1875, Darlington 1952, Cassani et al. 1989, Niesenbaum 1992, Howard et al. 2001, Costello et al. 2003, Hepner 2003)Defensese contrasting dark brown ends and bright green saddle are a form of aposematism, which is common among organisms with strong defensive characteristics (Speed and Ruxton 2005). Not necessarily related to aposematism, there are also sets of cream colored spots on the posterior end of the caterpillar that seemingly imitates a face (Dyar and Morton 1986, Packard 1983). ese spots are akin to other Lepidopteran larvae that have more articulate eye spots or snake mimicry in that they confuse aggressors by seeming to have large eyes. ese markings discourage predators from attacking by signaling danger (Speed and Ruxton 2005). e family Limacodidae is also recognized for its members having eshy horns on the body, each containing numerous hollow spines. In A. stimulea, these hollow spines are present on the edges of the body length, but are concentrated on tuburculated protrusions that adorn both ends of the larvae creating a total of four large horns. Spinose processes vary in shape, length, and articulation relative to where they are on the body, and whether or not multiple types are in proximity to each other (Dyar and Morton 1986, Gilmer 1925, Packard 1983). All of them are capable of breaking away from the body and remaining embedded in contacted surfaces. ese spines contain hemolytic and vesicating venom, secreted from nearby glands, that causes direct tissue damage (Scott 1963, Edwards et al. 1986, Murphy et al. 2009). Saddleback larvae use their great adhesive properties to stay rmly mounted to a surface. When coupled with the venomous spines on the body, this allows the caterpillar to remain attached to any selected surface and oer its spines to aggressors. Sometimes, if disturbed, larvae will arch their back inward in an attempt to create contact with all anterior and posterior horns (Packard 1893, Murphy et al. 2009); however, they are unable to retract the head capsule into the body for protection (Packard 1893). e aposematic signaling and venomous spines function together to preserve the caterpillar, as the metabolic cost of developing either characteristic is steep. By having both, the organism can enhance the eects of both characteristics and further decrease the probability of aggressive contact (Speed and Ruxton 2005). e large, potent spines of A. stimulea have been shown to eectively deter vertebrate and invertebrate aggressors, with specic interactions showing reduviid bugs, chrysopid lacewings, and vespid wasps avoiding the saddleback caterpillars rather than attacking them (Murphy et al. 2009). During pupation, the silken cocoon is impregnated with calcium oxalate that is excreted from the maphigian tubules; this hardens the cocoon against disturbance (Ishii et al. 1984). Care should be taken if around a cocoon of Acharia sp., as this genus is documented to weave urticating spines into the silk layer as well (Epstein 1996, Scott 1963).Medical SignicanceAcharia stimulea is best known as a medically signicant species. e large spines and potent hemolytic venom rank it as one of the most important North American species of urticating caterpillars, with larvae from the moth family Megalopygidae being the only lepidopterans considered more dangerous (Scott 1963, 1964; Durden and Mullen 2009; Hossler 2010). e spines of A. stimulea are strong, acutely pointed, and hollow. ey embed deeply into tissue and break o, and can interrupt healing as the protoplasm from the venom glands dries into the tissue area (Gilmer 1925). e venom itself can cause a systemic condition called erucism or acute urticaria, for which severe symptoms may include migraines, gastrointestinal symptoms, asthma complications, anaphylactic shock, rupturing of erythrocytes, and hemorrhaging (USAF 1982, Hossler 2009). Physically manifested symptoms may or may not be present with erucism (Hossler 2009). Contact dermatitis caused by A. stimulea includes immediate intense burning sensations

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7 around the contact zone, arector pili muscles tightening causing hair to stand on end, increased perspiration in the aected area, red blanching of the skin, and blistering (Edwards et al. 1986; Hossler 2009, 2010). Symptoms can last for ve hours, and leave red blotches in the envenomation site (Hossler 2009). Prevention of stings is the most eective measure when faced with erucism hazards: protect skin with long sleeves, pants, and gloves when anticipating potential contact with A. stimulea, and avoid areas of heavy infestation if known (USAF 1982; Hesler et al. 1999; Gottschling et al. 2007; Hossler 2009, 2010). Should contact occur, the removal of spines should always take precedence as the longer the spines are embedded in tissue the more venom is administered (Hossler 2009, 2010). Other symptoms should be treated on a case by case basis tailored for your specic reaction by a certied physician (Hossler 2009, 2010). Personal repellants, such as DEET, are not eective controls for A. stimulea. Manual removal of eggs, larvae or cocoons with proper protective wear and tools is an eective method of control in case of unpredicted population increase (Benaim-Pinto et al. 1991, Gottschling et al. 2007, Iserhard et al. 2007). Spines of urticating caterpillars can become airborne and consequently be inhaled or contact sensitive tissues like the eyes and nose. ey may also embed in surfaces such as wooden tables and plastics, which become a contact hazard at a later time if the area is not cleaned. Stray spines can also get caught in fabrics, such as carpet, aprons and clothing and come into skin contact that way (Scott 1963; USAF 1982; Hossler 2009, 2010). If handling urticating caterpillars regularly, such as in rearing facilities, ensure you have access to a frequently sanitized, well ventilated work environment to mitigate hazards of loose spines (Hossler 2009Pest SignicanceLandscapinge polyphagous nature of A. stimulea can cause it to be present in a large variety of ornamentals or backyard garden situations (see previous list). Despite this, it is not a signicant defoliator of any one plant species (Cassani et al. 1989, Howard et al. 2001, Costello et al. 2003). Acharia stimulea is a venom hazard related to working around plants it may select for oviposition. Wearing appropriate skin covering and manual removal of oenders are options available to those working in the landscape or garden.AiculturalAs above, the polyphagous nature of A. stimulea has restricted its signicance as a defoliator of any one plant. It is interesting to note that A. stimulea is found on more species of palms, including crop palms such as those which produce coconut or oils, than any other limacodid (Howard et al. 2001). Because of the adhesive abilities and strong physical and chemical defenses, A. stimulea is not likely to avoid disturbance or danger, which puts plant handlers at higher risk for contact. e lack of nutrition yielded by palms in particular would also encourage longer feeding intervals by the larvae, leading to higher incidence of contact (Howard et al. 2001). Pest control options such as Bacillus thuringiensis and diubenzuron have been used to control massive infestations of urticating caterpillars with success (DeLong 1981, USAF 1982, Scholz et al. 1993, Dunlop and Freeman 1997, Hessler et al. 1999, Balit et al. 2001).Selected ReferencesBalit CR, Ptolemy HC, Geary MJ, Russell RC, Isbister GK. 2001. Outbreak of caterpillar dermatitis caused by airborne hairs of the mistletoe browntail moth (Euproctis edwardsi ). Medical Journal of Australia 175: 641-643. Benaim-Pinto C, Pernia-Rosales B, Rojas-Peralta R. 1991. Dermatitis caused by moths of Hylesia genus (Lepidoptera, Saturniidae) in northeastern states of Venezuela: I. biocenology of Hylesia metabus Cramer. Clinical features of lepidopterism determined by this species. American Journal of Contact Dermatology 2: 213. Cassani JR, Maloney DR, Habeck DH, Bennett FD. 1989. New insect records on Brazilian peppertree, Schinus terebinthifolius (Anacardiaceae), in south Florida. Florida Entomologist 72: 714-716. Common IFB. 1990. Moths of Australia. Melbourne University Press, Melbourne, AU. 535 pp. Costello SL, Pratt PD, Rayamajhi MB, Center TD. 2003. Arthropods associated with above-ground portions of the invasive tree, Melaleuca quinquenervia in South Florida, USA. Florida Entomologist 86: 300-322. Covell CV Jr. 2005. A Field Guide to Moths of Eastern North America. Virginia Museum of Natural History, Martinsville, VA. 496 pp. Darlington EP. 1952. Notes on blueberry Lepidoptera in New Jersey. Transactions of the American Entomological Society 78: 33-57.

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8 DeLong S. 1981. Mulberry tussock moth dermatitis. A study of an epidemic of unknown origin. Journal of Epidemiology and Community Health 35: 1-4. Dunlop K, Freeman S. 1997. Caterpillar dermatitis. Australasian Journal of Dermatology 38: 193-195. Dyar HG, Morton EL. 1896. e life-histories of the New York slug caterpillars II. Journal of the New York Entomological Society 4: 1-9. Edwards EK Jr, Edwards EK, Kowalczyk AP. 1986. Contact urticaria and allergic contact dermatitis to the saddleback caterpillar with histologic correlation. International Journal of Dermatology 25: 467. Epstein ME. 1996. Revision and phylogeny of the limacodid-group families, with evolutionary studies on slug caterpillars (Lepidoptera: Zygaenoidea). Smithsonian Contributions to Zoology 582: i-iii, 1-102. Gilmer PM. 1925. A comparative study of the poison apparatus of certain lepidopterous larvae. Annals of the Entomological Society of America 18: 203-239. Gottschling S, Meyer S, Dill-Mueller D, Wurm D, Gortner L. 2007. Outbreak report of airborne caterpillar dermatitis in a kindergarten. Dermatology 215: 5-9. Heppner JB. 2003. Arthropods of Florida and Neighboring Land Areas, Volume 17: Lepidoptera of Florida part 1: Introduction and Catalogue. Florida Department of Agriculture and Consumer Services: Division of Plant Industry, Gainesville, FL. 317 pp. Hesler LS, Logan TM, Benenson MW, Moser C. 1999. Acute dermatitis from oak processionary caterpillars in a U.S. military community in Germany. Military Medicine 164: 767-770. Hossler EW. 2009. Caterpillars and moths. Dermatologic erapy 22: 353-366. Hossler EW. 2009. Caterpillars and moths Part II: dermatological manifestations of encounters with Lepidoptera. Journal of the American Academy of Dermatology 62: 13-28. Howard FW, Moore D, Giblin-Davis RM, Abad RG. 2001. Insects on Palms. pp. 33-64. CABI publishing, New York, NY. 400 pp. Ishii S, Inokuchi T, Kanazawa J, Tomizawa C. 1984. Studies on the cocoon of the Oriental moth, Monema avescens (Lepidoptera: Limacodidae), 3; structure and composition of the cocoon in relation to hardness. Japanese Journal of Applied Entomology and Zoology 28: 269-273. Iserhard CA, Kaminski LA, Marchiori MO, Teixeira EC, Romanowski HP. 2007. Occurrence of lepidopterism caused by the moth Hylesia nigricans (Berg) (Lepidoptera: Saturniidae) in Rio Grande do Sul State, Brazil. Neotropical Entomology 36: 612-615. Landau D, Prowell D. 1999. A partial checklist of moths from mixed mesophytic hardwood forests in Louisiana (Insecta: Lepidoptera). Transactions of the American Entomological Society 125: 139-150. McNaulty BJ. 1967. Outline of life histories of some West African Lepidoptera, Part II: Limacodidae. Proceedings of the South London Entomological and Natural History Society 1967: 1-12. Mullen GR, Durden LA. (editors) 2009. Medical and Veterinary Entomology, 2nd edition. Elsevier, Amsterdam. 637 pp. Murphy SM, Leahy SM, Williams LS, Lill JT. 2009. Stinging spines protect slug caterpillars (Limacodidae) from multiple generalist predators. Behavioral Ecology 21: 153-160. Murphy SM, Lill JT. 2010. Winter predation of diapausing cocoons of slug caterpillars (Lepidoptera: Limacodidae). Environmental Entomology 39: 1893-1902. Niesenbaum, RA. 1992. e eects of light environment on growth and herbivory in the dioecious shrub Lindera benzoin (Lauraceae). American Midland Naturalist 128: 271-275. Packard AS. 1893. e life history of certain moths of the family Cochliopodidae, with notes on their spines and tubercles. Proceedings of the American Philosophical Society 31: 83-108. Schremmer F. 1990. Das Schlpfen der Puppe des Asselspinners (Apoda limacodes Hufn.) (Lepidoptera, Limacodidae). Zeitschri der Arbeitsgemeinscha Osterreichischer Entomologen 42: 44-52. Scott HG. 1963. Envenomization. pp. 1-11. United States Department of Health, Education, and Welfare, Atlanta, GA. 18 pp.

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9 Scott HG. 1964. Pest Controls pictorial key of the month: stinging caterpillars. pp. 24-25. United States Department of Health, Education, and Welfare, Atlanta, GA. Scholz A, Russell R, Geary M. 1993. Investigation of caterpillar dermatitis in school children. New South Wales Public Health Bulletin 4: 65-66. Snow FH. 1875. Catalogue of the Lepidoptera of eastern Kansas. Transactions of the Kansas Academy of Science 4: 29-63. Speed MP, Ruxton GD. 2005. Warning displays in spiny animals: one (more) evolutionary route to aposematism. Evolution 59: 2499-2508. USAF. 1982. Urticating caterpillars.. USAFSAM/EKS, Brooks Air Force Base, TX. pp. 1-3 Wagner DL. 2005. Caterpillars of Eastern North America: a Guide to Identication and Natural History. Princeton University Press, Princeton, NJ. pp. 52.