Bug FAQDusky Bog Fly
Parhelophilus rex · Order: Diptera · Family: Syrphidae
The Dusky Bog Fly lives in northern parts of North America. Adult flies visit flowers to drink nectar and collect pollen for protein.
Source: Wikipedia
How to recognize it
Adults are called flower flies because they are commonly seen on flowers.
Source: Wikipedia
Where it lives
These flies are typically found on flowers where they feed.
Source: Wikipedia
What it eats
Adults obtain energy from nectar and protein from pollen on flowers.
Source: Wikipedia
Life cycle
The larvae of the Dusky Bog Fly are unknown.
Source: Wikipedia
Where it comes from
Parhelophilus rex is a fairly common species in northern North America.
Source: Wikipedia
Where it is found in the US
Recorded in 16 of 51 states and DC. Most records: Maine, Massachusetts, New York, Vermont, Ohio, Washington, Minnesota, New Hampshire.
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 do Dusky Bog Flies eat?
Adults feed on nectar for energy and on pollen for protein.
Source: Wikipedia
Same family (Syrphidae)
Sources
- Wikipedia: https://en.wikipedia.org/wiki/Parhelophilus_rex
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.