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

National Moth Week photos of insects and people. Here's how to add your images.

Photos of insects and people from 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


Species Bertholdia trigona - Grote's Bertholdia - Hodges#8258

Moth 6 - Bertholdia trigona Moth - Bertholdia trigona Grote's Bertholdia - Bertholdia trigona Grote's Bertholdia - Bertholdia trigona Bertholdia trigona Bertholdia trigona Bertholdia trigona? - Bertholdia trigona Bertholdia? - Bertholdia trigona
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 Phaegopterina
Genus Bertholdia
Species trigona (Grote's Bertholdia - Hodges#8258)
Hodges Number
Synonyms and other taxonomic changes
Bertholdia trigona (Grote, 1879)
Halysidota trigona Grote, 1879
* phylogentic sequence #930390
Explanation of Names
Trigona derives from Latin meaning "triangle".
Forewing length 16-18 mm. (1)
Adult: forewing long, pointed, brown with large pale yellow translucent patch along costa near apex, and 2-3 yellowish spots along inner margin near base; several black dots within translucent patch; shape of patch is approximately rectangular, and its margins are fairly straight; terminal line checkered pale and dark; hindwing short, white, diffused with pink along inner margin and at base; abdomen red; thorax brown with red accents.
Southwestern United States from Arizona to Texas, north in the mountains to Wyoming and South Dakota.
Adults fly mid-July and August. (1)
First through third instar larvae feed on algae, moss, and other small epiphytes growing on citrus trees. Fourth instar larvae switch to herbaceous plants (2). McFarland had young larvae feed on lichens from the stems of mountain mahogany (Cerocarpus). (1)
Life Cycle
Females lay single layers of green eggs. (1)
These moths emit ultrasonic clicks that appear to jam the echolocation system of bats that might prey on them (ScienceNOW).
See Also
Bertholdia specularis forwing patch is irregular-shaped (not rectangular), and its distal margin is scalloped (not straight) - see pinned photo by Matthew Barnes, and live photo by Mark Gurney
Print References
Grote, A.R. 1879. A new Halsidota collected by Professor Snow. The North American Entomologist 1(6): 46
Powell, J.A. & P.A. Opler 2009. Moths of Western North America. University of California Press. pl.49.1f, p.273 (1)
Internet References
Moth Photographers Group - species page
pinned adult images (Bruce Walsh, Moths of Southeastern Arizona)
pinned adult image by Paul Opler, plus US distribution map (
pinned adult image (New Mexico State U.)
Works Cited
1.Moths of Western North America
Powell and Opler. 2009. UC Press.
2.Tiger Moths and Woolly Bears: behavior, ecology, and evolution of the Arctiidae.
William E. Conner (ed.). 2009. Oxford University Press.