Bug FAQStonemyia tranquilla
Stonemyia tranquilla · Order: Diptera · Family: Tabanidae
Stonemyia tranquilla is a species of horsefly in the family Tabanidae. Adults are about 1.5 cm long.
Source: Wikipedia
How to recognize it
Stonemyia tranquilla, known as the peaceful stonian horsefly, belongs to the Tabanidae family.
Source: Wikipedia
Size
The fly measures roughly 1.5 cm in length.
Source: Wikipedia
Where it comes from
Its native range includes the United States and Canada, primarily in the eastern regions listed above.
Source: Wikipedia
Where it is found in the US
Recorded in 15 of 51 states and DC. Most records: New Hampshire, Vermont, Maine, New York, Pennsylvania, Massachusetts, Michigan, North Carolina.
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
Source: GBIF
More photos
Same family (Tabanidae)
Sources
- Wikipedia: https://en.wikipedia.org/wiki/Stonemyia_tranquilla
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.