Bug FAQExochomus californicus
Exochomus californicus · Order: Coleoptera · Family: Coccinellidae
Adult Exochomus californicus are tiny beetles about 3.5 to 4 mm long. They have a black head and pronotum, with elytra that are black or brown and feature a yellow-orange rectangular area near the shoulder and a subapical spot. This species lives in western North America, recorded from Washington through Nevada to northern California.
Source: Wikipedia
How to recognize it
The head and pronotum are black.
Source: Wikipedia
Size
Adults reach about 3.5 to 4 mm in length.
Source: Wikipedia
Where it lives
It occurs in the same western North American region as its range.
Source: Wikipedia
Where it comes from
It is native to North America, found from Washington to Nevada and northern California.
Source: Wikipedia
Where it is found in the US
Recorded in 6 of 51 states and DC. Most records: California, Oregon, Utah, Nevada, New York, Wyoming.
Darker = more records. Counts are museum and citizen-science records, not population size.
Source: GBIF
Status: native in North America; native in United States. Source: iNaturalist
Months it is reported in the US
Source: GBIF
More photos
Same family (Coccinellidae)
Sources
- Wikipedia: https://en.wikipedia.org/wiki/Exochomus_californicus
Look it up elsewhere: GBIF · iNaturalist · BugGuide · ITIS · Wikipedia
Text written 2026-10-27 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-27.