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Ichneumonidae - Xorides filiformis (Gravenhorst) | by Nigel Jones
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Ichneumonidae - Xorides filiformis (Gravenhorst)

New to Britain

There were several of these basking on a beech trunk surrounded by felled oak remains. This wasp is associated with a host living in the dead wood of the oak.


After I failed to determine the species of Xorides from a key to British species of Xorides, Gavin Broad at the Natural History Museum has kindly determined them as Xorides filiformis (Gravenhorst). Gavin advises ". These are four males of Xorides filiformis (Gravenhorst), which is a nice new record for the UK! So no wonder that it didn’t satisfactorily match irrigator or praecatorius. This is the first time anybody’s found a new xoridine for Britain since 1980. It’s not terribly surprising that Xorides filiformis has turned up as it is known from across much of Europe, but it seems to be rather rarely collected; there are only 11 specimens in our collection."


Xorides. These are parasites of wood boring beetles.


Hollies Wood, Haughmond Hill 7 August 2017

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Taken on August 7, 2017