Bug FAQWrinkle-winged Calosoma
Calosoma marginale · Order: Coleoptera · Family: Carabidae
Calosoma marginale is a ground beetle that hunts caterpillars and scarabaeids. It lives across Central and North America and is active at dusk, spending winter underground.
Source: Wikipedia
How to recognize it
Calosoma marginale, called the rimmed caterpillar hunter, belongs to the beetle family Carabidae.
Source: Wikipedia
What it eats
It preys on caterpillars and scarabaeid beetles.
Source: Wikipedia
Life cycle
Adults are active at twilight and spend the winter underground.
Source: Wikipedia
When you see it
Adults are active at twilight and overwinter in the ground.
Source: Wikipedia
Where it is found in the US
Recorded in 16 of 51 states and DC. Most records: Texas, Oklahoma, Kansas, New Mexico, Arizona, Colorado, California, Utah.
Darker = more records. Counts are museum and citizen-science records, not population size.
Source: GBIF
Months it is reported in the US
Source: GBIF
More photos
Questions people ask
When are adult Calosoma marginale active?
Adults are active at dusk and spend the winter underground.
Source: Wikipedia
Same family (Carabidae)
Sources
- Wikipedia: https://en.wikipedia.org/wiki/Calosoma_marginale
Look it up elsewhere: GBIF · iNaturalist · BugGuide · ITIS · Wikipedia
Text written 2026-10-24 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-24.