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

Do you use BugGuide? Please consider a monetary gift on this Giving Tuesday.

Donate Now

Your donation to BugGuide is tax-deductible.

Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes

Upcoming Events

See Moth submissions from National Moth Week 2023

Photos of insects and people from the 2022 BugGuide gathering in New Mexico, July 20-24

Photos of insects and people from the Spring 2021 gathering in Louisiana, April 28-May 2

Photos of insects and people from the 2019 gathering in Louisiana, July 25-27

Photos of 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

Previous events


Species Operophtera occidentalis - Hodges#7438

Bruce Spanworm - Operophtera occidentalis - male 2005 Operophtera  bruceata - Bruce Spanworm Moth 7437 - Operophtera occidentalis - male Operophtera bruceata occidentalis - Operophtera occidentalis - female Operophtera occidentalis - male Operophtera occidentalis - male Operophtera occidentalis - male Operophtera occidentalis - 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
Species occidentalis (Operophtera occidentalis - Hodges#7438)
Hodges Number
Synonyms and other taxonomic changes
Operophtera occidentalis (Hulst, 1896)
Rachela occidentalis Hulst, 1896
Explanation of Names
Operophtera bruceata occidentalis (Hulst, 1896), listed in the 1983 Hodges Checklist as a full species, was synonymized as a subspecies of Operophtera bruceata (Hulst, 1886) in Troubridge & Fitzpatrick (1993). This species is treated as a full species in Pohl et al. (2016)(1) (unpublished provisional checklist) and Pohl et al. (2018)(2) following findings in Gwiazdowski et al. (2013), Ann. Entomol. Soc. Am. 106(2): 143-151.
West of the Cascade mountains in Oregon, WA, and British Columbia (Gwiazdowski et al. 2013)
Print References
Gwiazdowski, R.A., J.S. Elkinton, J.R. Dewaard, M. Sremac, 2013. Phylogeographic Diversity of the Winter Moths Operophtera brumata and O. bruceata (Lepidoptera: Geometridae) in Europe and North America. Annals of the Entomological Society of America. 106 (2): 143-151.