bobthebirder's picture

St Mark's Fly

Observed: 27th April 2011 By: bobthebirderbobthebirder is knowledgeable about Invertebratesbobthebirder’s earned reputation in Invertebratesbobthebirder’s earned reputation in Invertebratesbobthebirder’s earned reputation in Invertebratesbobthebirder’s earned reputation in Invertebrates
bibio_male
bibio_male 1
Description:

One of hundreds seen on the biodiversity survey carried out by Amersham U3A

Identifications
Species interactions

No interactions present.

Species with which St Marks Fly (Bibio marci) interacts

Comments

ophrys's picture

Dilophus?

I agree with the male in the first picture, but the second (female) looks more like a Dilophus. As far as I can see, the front tibiae have medial spurs and apical spurs, rather than the single long and short spur of a Bibio.

Ian
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bobthebirder's picture

second fly

I've uploaded a close-up of the second fly, to see if anyone can confirm the ID

Bob Ford

ophrys's picture

Dilophus

Looking at this again, the second picture is definitely a Dilophus, and almost certainly a female of the common D. febrilis, as the wings appear to be very dark, near black, with pale tips.

Ian
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