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Species Arctia parthenos - St. Lawrence Tiger Moth - Hodges#8162

White-spotted moth - Arctia parthenos Platarctia parthenos - Arctia parthenos - female Moth - Arctia parthenos Platarctia parthenos? - Arctia parthenos St. Lawrence Tiger Moth  - Arctia parthenos St. Lawrence Tiger Moth  - Arctia parthenos moth - Arctia parthenos St. Lawrence Tiger Moth :  Platarctia parthenos - Arctia parthenos - female
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 Arctiinae (Tiger and Lichen Moths)
Tribe Arctiini (Tiger Moths)
Subtribe Arctiina
Genus Arctia
Species parthenos (St. Lawrence Tiger Moth - Hodges#8162)
Hodges Number
Synonyms and other taxonomic changes
Arctia parthenos Harris, 1850
moved back from Platarctia
One of four species in the genus for North America north of Mexico.(1)
wingspan 50-65 mm
Adult: forewing brown with white or pale yellowish spots and bars (but not continuous lines); hindwing bright yellow with black PM band joined at one or more places to large black basal patch
Newfoundland and Labrador to the tundra of Northwest Territories, Yukon, and Alaska, south in the east to Michigan (and in the Appalachians to North Carolina), and south in the Rockies to Arizona and New Mexico
boreal mixed woods and parklands, moist shrubby arctic tundra, mountains in the south
adults fly from June to August (peak numbers from mid-June to early July in the north)
larvae take two years to complete development, and are active during the short northern summer, but dormant under the snow for much of each year
larvae feed on leaves of alder, aspen, birch, and willow in the wild, and have been reared in captivity on bedstraw, dandelion, lettuce, and snowberry
Life Cycle
semivoltine: one generation every two years; spends the first winter as a fifth-instar larva, and the second winter as an eighth-instar larva
See Also
Great Tiger Moth (Arctia caja) forewing has continuous white lines, and hindwing has large dark blue spots outlined in black (compare images of both species at CBIF)
Print References
Lafontaine JD, Schmidt BC (2010) Annotated check list of the Noctuoidea (Insecta, Lepidoptera) of North America north of Mexico,p. 18.(1)
Ronka, K., J. Mappes, L. Kaila, N. Wahlberg, 2016. Putting Parasemia in its phylogenetic place: a molecular analysis of the subtribe Arctiina (Lepidoptera). Systematic Entomology, 41(4): 844-853.(2)
Internet References
distribution in Canada list of provinces and territories (U. of Alberta, using CBIF data)