Crossocerus cetratus


Another small, predominantly black wasp - the swollen front leg is distinctive in this species.  There are several similar species and care is needed with identification.

Identification difficulty
Recording advice

Unless identified by a recognised expert, a photo is required and the specimen should be examined with a microscope. In the comments box, state the key or ID method used and describe the size and identifying characters.


Occurring in sunny spots where suitable nest sites are available, such as margins of woods, hedgerows, scrubby heaths, parks and gardens.

When to see it

Mainly May to August and more sparingly into September.

Life History

Small diptera are widely held to be the main, if not sole prey items. This small wasp nests mainly in dead wood but also in hollow plant stems. It appears to utilise a wide variety of trees and shrubs.

UK Status

Quite widely recorded across England and Wales, just reaching southern Scotland.

VC55 Status

Status in Leicestershire and Rutland not known.

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Leicestershire & Rutland Map


Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

UK Map