Criorhina floccosa
In 3 days ~10% in a week ~20%
Criorhina floccosa, is a species of hoverfly. It is found in many parts of the Palearctic including Europe. The larvae of C. floccosa are associated with rotting deciduous wood. Adults are usually found in woodland with overmature trees and are seen visiting flowers to feed.
External images For terms see Morphology of Diptera A large, broad, bumblebee mimic (wing length 10–13 mm.), densely yellow, fox red or yellow and black pilose. Tergite 2 with distinct side tufts of long yellow hairs. Tergites 3 and 4 with short, dense reddish or tawny pile and dust, not obscuring the ground-colour. Tibia 1 and 2 with pale, adpressed, short hairs.
The larva is illustrated by Rotheray (1993) Palaearctic. South Sweden and Denmark South to the Pyrenees from Ireland eastwards to European Russia as far as the Caucasus Habitat: Fagus and Quercus ancient woodland with over-mature and senescent trees.
Arboreal, but descends to visit flowers of white umbellifers, Cornus sanguinea, Crataegus, Photinia, Prunus spinosa, Ribes alpina, Rubus idaeus, Sorbus aucuparia, Sorbus aria. The flight period is from the beginning of April to the beginning of... Wikipedia →
| # | Park | Country | Daily sighting probability |
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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 Buff-Tailed Bear Hoverfly sighting in London on a given day, based on 8 verified sightings from GBIF citizen-science data. It is the 1153rd 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.
May
In that month about 10% of wildlife watchers report a Buff-Tailed Bear Hoverfly in London on a given day, against under 5% in June to April, the lowest months.
Only London, in our data
London is the only city on Wallace's Line with enough records to rate Buff-Tailed Bear Hoverfly sightings: under 5% of wildlife watchers there report one on a given day.
Same family: Syrphidae
The closest relatives of the Buff-Tailed Bear Hoverfly that you can see in London (family Syrphidae, Hover Flies) are Yellow-Haired Sun Fly (about 40%), Marmalade Hover Fly (about 30%) and Hornet Mimic Hover Fly (about 30%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Buff-Tailed Bear Hoverfly is recorded against all the insects logged in London (8 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.
