Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada

Genus Arachnis

Painted Arachnis? - Arachnis picta Caterpillar - Arachnis aulaea Tiger - Arachnis citra Tiger - Arachnis citra Arachnis sp. - Arachnis cool moth - Arachnis Beautiful white & grey-spotted tiger moth - Arachnis picta Something in the Arctiini? - Arachnis
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 Spilosomina
Genus Arachnis
Synonyms and other taxonomic changes
Arachnis Geyer, 1837
Explanation of Names
Arachnis is derived from Latin "spider", referring to the weblike lines on the forewings.(1)
See Also
Bruce Walsh on the four species of Arachnis present in southeastern Arizona:
Arachnis picta - the most common.
Arachnis nedyma - a pale version of picta. While picta flies after the monsoons in the desert mountain ranges, nedyma is a rarer pre-monsoon flier in just a few of the ranges in SE Arizona and at elevation (over 6000 feet).
Arachnis aulaea - has a much darker (almost black) hindwing relative to picta. Flies just at the start of the monsoons, and typically a little lower in elevation (around 4000-6000 feet).
Arachnis zuni - truly spectacular, much larger (and more colorful) than picta. Rare, again a pre-monsoon flier at elevation.
Print References
Clarke, J. F. Gates 1941. The North American moths of the genus Arachnis, with one new species. Proceedings USNM 92(3123): 59-70, pl.10-12
Works Cited
1.Tiger Moths and Woolly Bears: behavior, ecology, and evolution of the Arctiidae.
William E. Conner (ed.). 2009. Oxford University Press.