Syrphus vitripennis
In 3 days ~10% in a week ~20%
Syrphus vitripennis is a very common European and North American species of hoverfly. Its larvae feed on aphids For terms see Morphology of Diptera Wing length 7·25-10·25 mm. Frons above lunulae black. Tergites 3 and 4 with entire yellow bands and lateral margin of tergites black. Male: femora 3 black for basal three-quarters. Female: femora 3 black on basal two-thirds. The male genitalia and the larva are figured by Dusek and Laska (1964). See references for determination.
Palearctic throughout. Nearctic Alaska to California. Migratory. Habitat: Deciduous and coniferous woodland and anthropophilic, occurring along field hedges, in suburban gardens and parks. Flies March to October. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Black-Thighed Flower Fly sighting in Berlin on a given day, based on 6 verified sightings from GBIF citizen-science data. It is the 869th most-seen of the 1065 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Black-Thighed Flower Fly in Berlin on a given day, so our monthly data shows no clear season.
Yes
Of the 2 cities where we can rate Black-Thighed Flower Fly sightings, Berlin has the highest daily chance: under 5%. Next come Paris (France, under 5%).
GBIF citizen-science records
It is estimated from how often the Black-Thighed Flower Fly is recorded against all the insects logged in Berlin (6 verified sightings), 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.
