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

Information about the 2019 BugGuide Gathering in Louisiana, July 25-27

Discussion, insects and people from the 2018 gathering in Virginia, July 27-29

Photos of insects and people from the 2015 gathering in Wisconsin, July 10-12

Photos of insects and people from the 2014 gathering in Virginia, June 4-7.

Photos of insects and people from the 2013 gathering in Arizona, July 25-28

Photos of insects and people from the 2012 gathering in Alabama

Photos of insects and people from the 2011 gathering in Iowa


Genus Operophtera

Possible Operophterini moth? - Operophtera caterpillar on scrub oak - Operophtera brumata Operophtera bruceata - Bruce Spanworm Moth 7437 - Operophtera bruceata - male Moth/Butterfly in the Winter ? - Operophtera bruceata - male ID request, Moth 63. dorsal view - Operophtera bruceata - female Operophtera bruceata - Bruce Spanworm - Hodges#7437 - Operophtera bruceata Operophtera bruceata - Bruce Spanworm - Hodges#7437 - Operophtera bruceata - male Operophtera occidentalis - male
Show images of: caterpillars · adults · both
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Lepidoptera (Butterflies and Moths)
Superfamily Geometroidea (Geometrid and Swallowtail Moths)
Family Geometridae (Geometrid Moths)
Subfamily Larentiinae
Tribe Operophterini
Genus Operophtera
Synonyms and other taxonomic changes
Operophthera (a misspelling)
3 species in North America listed at All-Leps
(4 species are listed at, but one of them (occidentalis) is considered a synonym of bruceata by All-Leps)
3 species in Canada (CBIF)
On distinguishing female O. bruceata from O. brumata: "On Bruce spanworm the wing buds would be much shorter than the second segment of the abdomen. In winter moth the wings are longer than the second segment" - Jeff Boettner
O. bruceata occurs coast to coast in northern United States and Canada, south in the west to California but absent from southeastern states
O. brumata occurs on both coasts but not inland
O. danbyi occurs only on the west coast
Internet References
pinned adult images of all 3 species (CBIF)
presence in California of 2 species (U. of California at Berkeley)
distribution in Canada list of provinces for 3 species (CBIF)