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Orthonevra intermedia

 
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stuart
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Joined: 11 May 2005
Posts: 737
Location: Peterborough, UK

PostPosted: Sun Jul 08, 2007 11:06 am    Post subject: Orthonevra intermedia Reply with quote

Orthonevra intermedia Lundbeck, 1916

Added to the British list in 2006 by Martin Drake (Drake, C.M., 2006. Orthonevra intermedia Lundbeck, 1916 (Diptera, Syrphidae) new to Britain. Dipterists Digest (2nd Series) 13(2), 87-91, published 2007) from Delamere Forest: Three males and a female swept on 02/07/2003 from recently cleared secondary birch woodland at Norley Moss, next to the lake at Hatchet Mere. Another two males on 06/07/2003 at Barnsbridge Basin - a small but intact bog.

This is a yellow-legged Orthonevra and so is most similar to O. geniculata. It keys out fairly readily using the key in van Veen (Hoverflies of Northwest-Europe, M.P. van Veen, 2004, KNNV Publishing). The male genitalia are distinctive and there are differences in the shape of the face and antennae as illustrated by Martin Drake:

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