Chorisops tibialis
In 3 days ~10% in a week ~20%
Chorisops tibialis, the dull four-spined legionnaire, is a Palearctic species of soldier fly. A small (Size 3 to 4 mm.) slender fly. The male has a metallic green thorax and scutellum (both are greenish black in females). The humeri may be yellowish. The scutellum bears four yellow spines. The abdomen in both males and females is yellow (discally) and black at the sides and posteriorly. The male has black and tan banded legs. Females have yellow legs with dark tarsi. The clear wings have dark stigma.
The habitat is moist or shaded locations with trees. Males sometimes move in rapidly moving swarms. Adults are found from June to September. The saproxylic larvae are found in decaying wood debris and rot holes in trees. Wikipedia →
| # | Park | Country | Daily sighting probability |
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More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Dull Four-Spined Legionnaire sighting in London on a given day, based on 12 verified sightings from GBIF citizen-science data. It is the 971st 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.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Dull Four-Spined Legionnaire in London on a given day, so our monthly data shows no clear season.
Among the best
Of the 2 cities where we can rate Dull Four-Spined Legionnaire sightings, London ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Paris (France, under 5%).
Same family: Stratiomyidae
The closest relatives of the Dull Four-Spined Legionnaire that you can see in London (family Stratiomyidae, Soldier Flies) are Broad Centurion Fly (about 10%) and Twin-Spot Centurion Fly (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Dull Four-Spined Legionnaire is recorded against all the insects logged in London (12 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.
