moremoth's picture

St. Mark's Fly.

Observed: 28th April 2012 By: moremothmoremoth’s reputation in Invertebratesmoremoth’s reputation in Invertebratesmoremoth’s reputation in Invertebratesmoremoth’s reputation in Invertebratesmoremoth’s reputation in Invertebrates
St. Mark's Fly.
Description:

Black fly. This one seems to have got something sticky on its eyes and thorax. That might be why it was just walking around.

Identifications
Species interactions

No interactions present.

Species with which St Marks Fly (Bibio marci) interacts

Comments

steveplant's picture

Definitely a Bibio species but

It's definitely a Bibio species but I am not sure it is B. marci, there are a lot of them many similar. If you can give a size that can help with identification.

Steve

StevePlant

moremoth's picture

Size

It was bigger than the small Bibios I have seen recently. About 15mm, I think, excluding legs. In the photo it's on the side of my hand.
Bill

Bill Welch

ophrys's picture

marci

It is marci, as it is an all black species, both body and hairs. Then, the costal margin of the wing is dark and, crucially, the cross vein r-m is significantly shorter than the base of R4+5. Even without the size, that combination is diagnostic.

Ian
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moremoth's picture

Marci

Thanks for the diagnostic details!
Bill

Bill Welch

Simon Walker's picture

The Thing That Amazes Me...

...is the fact that it has hairy eyes...