Pachygaster leachii
In 3 days ~10% in a week ~20%
Pachygaster leachii, the yellow-legged black, is a European species of soldier fly. A minute fly of brilliant black color with a round abdomen and a body length of around 2.5-3.5 mm. The eyes are brown-red in males and obscure green in females. Both males and females have yellow antennae. The legs are of a pale yellow with a blackish ring, sometimes quite wide, at the apex of femora III. It has yellowish wings with pale veins. The halteres are yellowish-brown at the base.
The habitat is woodland with oak and elm. Associated with alder, hazel. The flight period is from June to August. Andorra, Austria, Azerbaijan, Belgium, Bulgaria, Czech Republic, England, France, Georgia, Germany, Hungary, Ireland, Italy, Netherlands, Poland, Portugal, Romania, Russia, Slovakia, Spain, Sweden, Switzerland, Wales, Yugoslavia.
Images representing Pachygaster leachii at Bold Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | London | 🇬🇧 United Kingdom |
Rare
Under 5% of wildlife watchers report a Yellow-Legged Black sighting in London on a given day, based on 16 verified sightings from GBIF citizen-science data. It is the 873rd most-seen of the 1504 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.
July
In that month about 10% of wildlife watchers report a Yellow-Legged Black in London on a given day, against under 5% in August to June, the lowest months.
Only London, in our data
London is the only city on Wallace's Line with enough records to rate Yellow-Legged Black sightings: under 5% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Yellow-Legged Black is recorded against all the insects logged in London (16 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.
