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Eulonchus tristis · Order: Diptera · Family: Acroceridae
Eulonchus tristis is a small-headed fly in the family Acroceridae.
Source: Wikipedia
How to recognize it
Eulonchus tristis is a small-headed fly in the family Acroceridae.
Source: Wikipedia
Size
It belongs to the group of small-headed flies.
Source: Wikipedia
What it eats
It feeds on pollen from the flowers it visits, especially those of Brodiaea elegans and Iris species.
Source: Wikipedia
Where it comes from
The species occurs in California, United States.
Source: Wikipedia
Where it is found in the US
Recorded in 5 of 51 states and DC. Most records: Oregon, California, Washington, Idaho, Montana.
Darker = more records. Counts are museum and citizen-science records, not population size.
Source: GBIF
Status: native in North America; native in Canada. Source: iNaturalist
Months it is reported in the US
Source: GBIF
More photos
Questions people ask
What plants does Eulonchus tristis pollinate?
It visits and carries pollen from Brodiaea elegans and Iris douglasiana, acting as an important pollinator for those flowers.
Source: Wikipedia
Same family (Acroceridae)
Sources
- Wikipedia: https://en.wikipedia.org/wiki/Eulonchus_tristis
Look it up elsewhere: GBIF · iNaturalist · BugGuide · ITIS · Wikipedia
Text written 2026-10-28 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-28.