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Classification:

Chrysotoxum verralli belongs to the subfamily Syrphinae, tribe Syrphini.

Distribution:

Denmark south to central France; Britain (Wales and central/southern England) eastwards through central Europe into European parts of Russia to the Caucasus and on into eastern Siberia.

Habitat:

Open areas in moist deciduous forests, often near standing or slow-flowing water.

Description:

Chrysotoxum verralli has a body length of 11 - 12 mm. The predominantly yellow abdomen has wide yellow stripes on the trailing edges of the segments 3 and 4 in addition to the yellow stripes interrupted in the middle. Both the yellow stripes and the black areas on the front half of the segments 3 and 4 go over the lateral seam. The black areas are not interrupted before the lateral seam. The 3rd antenna segment is shorter than the 1st and 2nd together.
There are a few similar, difficult to distinguish Chrysotoxum species.

Biology:

Chrysotoxum verralli flies from Mai/Juni to Oktober. Adults visit white umbellifers, Caltha, Galium boreale and Ligustrum.

References, further reading, links:

1. M.C.D.Speight: Species Accounts of European Syrphidae (Diptera), Glasgow 2011, Syrph the Net, the database of European Syrphidae, vol. 65, 285 pp., Syrph the Net publications, Dublin.
2. Gerald Bothe: Bestimmungsschlüssel für die Schwebfliegen (Diptera, Syrphidae) Deutschlands und der Niederlande, DJN, 1984, ISBN 3-923376-07-3
3. Menno Reemer, Willem Renema, Wouter van Steenis, Theo Zeegers, Aat Barendregt, John T. Smit, Mark P. van Veen, Jeroen van Steenis, Laurens van der Leij: De Nederlandse Zweefvliegen (Diptera: Syrphidae), Nederlandse Fauna 8, 2009.