zhouqi's picture

Black-insect-landed

Observed: 14th May 2013 By: zhouqi
black-insect-landed
insect-blk-flying
Description:

I have seen these last week, in more than one places in Cambridge. Near edge of path/railway/hedge/grass, flying in small swamps, pitch black, about 2cm long. Looks nasty but not attacking me. They are not ants.
Sorry not good photos.

Identifications
Species interactions

No interactions present.

Species with which St Marks Fly (Bibio marci) interacts

Comments

Mydaea's picture

Probably St Mark's fly Bibio

Probably St Mark's fly Bibio marci. Nearer 1cm than 2cm.

jeremyr's picture

size

these all came out on saturday here and scared the life out of me. Certainly a good 18mm. I'm not sure if that means it's a different Bibio. The 1cm flies I found were gifts between mating Empids. I collected both so they might look interesting side by side but I'm not sure if they're the same species

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Mydaea's picture

No - it is my error. I was

No - it is my error. I was thinking wing-length, not body-length

zhouqi's picture

Thanks

I read on the web of St Marks fly, I can confirm it mostly like was. It was its flying style that caught my eyes.