California Broad-necked Darkling Beetle

Coelocnemis dilaticollis · Order: Coleoptera · Family: Tenebrionidae

No source yet on danger. We have no source yet on whether it bites, stings or damages anything.
California Broad-necked Darkling Beetle
Photo: John G. Phillips, CC BY

The California broad-necked darkling beetle belongs to the family Tenebrionidae. It lives in the western parts of the United States and western Canada.

Source: Wikipedia

Where it comes from

Its primary range is the western United States and western Canada.

Source: Wikipedia

Where it is found in the US

Recorded in 9 of 51 states and DC. Most records: California, Washington, Oregon, Idaho, Wyoming, Montana, Utah, Nevada.

Darker = more records. Counts are museum and citizen-science records, not population size.

Source: GBIF

Status: native in North America; native in Canada; native in United States. Source: iNaturalist

Months it is reported in the US

JFMAMJJASOND

Source: GBIF

More photos

California Broad-necked Darkling Beetle photo 2
Photo: iNaturalist user, CC0
California Broad-necked Darkling Beetle photo 3
Photo: Trevor Van Loon, CC BY
California Broad-necked Darkling Beetle photo 4
Photo: Trevor Van Loon, CC BY
California Broad-necked Darkling Beetle photo 5
Photo: John Brew, CC BY

Same family (Tenebrionidae)

Red Flour BeetleRed Flour BeetleTribolium castaneumCan damage your homeConfused Flour BeetleConfused Flour BeetleTribolium confusumCan damage your homeRough-haired Lagria BeetleRough-haired Lagria BeetleLagria hirtaObscure Darkling BeetleObscure Darkling BeetleEleodes obscuraYellow Mealworm BeetleYellow Mealworm BeetleTenebrio molitorCan damage your homeSulphur BeetleSulphur BeetleCteniopus sulphureus

Sources

  • Wikipedia: https://en.wikipedia.org/wiki/Coelocnemis_dilaticollis

Look it up elsewhere: GBIF · iNaturalist · BugGuide · Wikipedia

Text written 2026-10-24 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-24.

How this page works

This is one bug's fact sheet. The colored box at the top says whether it is dangerous. Sections below cover how to recognize it, whether it is a pest, and how to deal with it. The US map shows which states have records; tap a state to see other bugs there.

Every fact on Bug FAQ comes from a named source (university extension sites, government agencies, GBIF, iNaturalist, Wikipedia). The source is linked next to each section. If we have no source for something, we leave it out.