Syrphus knabi
In 3 days ~10% in a week ~30%
Syrphus knabi (Shannon, 1916), the Eastern flower Fly, is an uncommon species of syrphid fly observed in the eastern United States and Canada. Syrphid flies are also known as Hover Flies or Flower Flies because the adults are frequently found hovering around flowers from which they feed on nectar and pollen. Adults are 7.2–12.9 mm (0.28–0.51 in) long. The larvae are predators of a variety of aphids in trees.
For terminology Speight key to genera and glossary Size Length. 7.2–12.9 mm (0.28–0.51 in) Head The male has bare eyes that are holoptic, meaning that the eyes are completely joined together. The frons is yellow and is yellow pollinose on the upper two-thirds with a pair of brown anterior spots on the lower one-third. It has a bluish green reflection, a black spot above each antenna, and fine, rather long black hairs that continue a short distance down between the antennae and eyes. In the female, the frons is black and sparsely pruinose on the upper one-quarter, otherwise mostly yellow, densely yellow pruinose, and commonly slightly darkened medially. The anterior part is narrowly shining yellow and has a pair of brown anterior spots. The width of the frons... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Acadia National Park | 🇺🇸 United States |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Montreal | 🇨🇦 Canada | |
| 2 | Boston | 🇺🇸 United States | |
| 3 | Washington | 🇺🇸 United States | |
| 4 | Toronto | 🇨🇦 Canada | |
| 5 | New York City | 🇺🇸 United States | |
| 6 | Chicago | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report an Eastern Flower Fly sighting in Acadia National Park on a given day, based on 5 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 347th most-seen of the 405 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
July and October
In those months about 10% of wildlife watchers report an Eastern Flower Fly in Acadia National Park on a given day, against under 5% in August–September and November–June, the lowest months.
Between 7 and 10 am
Across all the parks we cover, that three-hour window holds the most Eastern Flower Fly sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Only Acadia National Park, in our data
Acadia National Park is the only park on Wallace's Line with enough records to rate Eastern Flower Fly sightings: under 5% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Eastern Flower Fly is recorded against all the insects logged in Acadia National Park (5 verified sightings from 2019 to 2026), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
