Bug FAQYellow-thighed Thick-leg Fly
Tropidia albistylum · Order: Diptera · Family: Syrphidae
Adults are commonly seen on flowers where they sip nectar and eat pollen, while the larvae develop in water.
Source: Wikipedia
Where it lives
Adults are frequently found on flowers, feeding on nectar and pollen. The larvae live in aquatic environments.
Source: Wikipedia
What it eats
Adult flies obtain energy from flower nectar and protein from pollen.
Source: Wikipedia
Where it comes from
It is a rare species recorded across the eastern and central United States and into eastern Canada.
Source: Wikipedia
Where it is found in the US
Recorded in 32 of 51 states and DC. Most records: Virginia, Pennsylvania, Maryland, Illinois, Missouri, New York, North Carolina, New Jersey.
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
What do adult Yellow-thighed Thick-leg Flies eat?
They feed on nectar for energy and on pollen for protein.
Source: Wikipedia
Same family (Syrphidae)
Sources
- Wikipedia: https://en.wikipedia.org/wiki/Tropidia_albistylum
Look it up elsewhere: GBIF · iNaturalist · BugGuide · ITIS · Wikipedia
Text written 2026-10-25 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-25.