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Species Orgyia definita - Definite Tussock Moth - Hodges#8314

Definite Tussock male - Orgyia definita - male Orgyia definita - Definite Tussock Moth - Orgyia definita - male Orgyia definita. - Orgyia definita - male definite tussock moth - Orgyia definita - male Orgyia definita - male Orgyia definita Pennsylvania Moth - Orgyia definita Pennsylvania Moth - Orgyia definita
Show images of: caterpillars · adults · both
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Lepidoptera (Butterflies and Moths)
Superfamily Noctuoidea (Owlet Moths and kin)
Family Erebidae
Subfamily Lymantriinae (Tussock Moths)
Tribe Orgyiini
Genus Orgyia
Species definita (Definite Tussock Moth - Hodges#8314)
Hodges Number
Other Common Names
Definite-marked Tussock Moth
Chenille à houppes jaunes - En français… Ilze V-G.
Synonyms and other taxonomic changes
Orgyia definita (Packard, 1864)
WS ≈ 30mm
TL ≈ 15-17mm
Adult: FW of males are dark grayish-brown, with sharply defined AM and PM lines, often edged with wide brown bands. ST marked with sharp black dashes near costa, accented by bold, white crescent near inner margin. HW dark brown, almost black. Females are wingless. (1)

Larva: "Caterpillars of Orgyia definita are readily identified by the yellow color of the head, prothoracic plate and dorsal glands. The hair pencils are less fully developed than in the other species. The hair on the body is entirely whitish and the verrucae (the wart-like structures along the body) are pale yellow." (University of Florida)
Most common in New England and Middle Atlantic states. (University of Florida)
Larvae feed on apple, ash, basswood, birches, boxelder, cherry, elm, maple, oaks and willows (Auburn University)
CAUTION: the hairs of caterpillars in this genus are known to cause skin irritation.
Internet References
Moth Photographers Group – images of live and pinned adults
BOLD Systems - images of pinned DNA supported specimens
BAMONA – description with images of live adults and caterpillar
Works Cited
1.Peterson Field Guide to Moths of Northeastern North America
David Beadle and Seabrooke Leckie. 2012. Houghton Mifflin.