What's That Bug? does not endorse extermination

mystery fly?
Location: Sandwich, MA, Cape Cod, USA
July 16, 2011 3:13 pm
Hi, I found this guy on my porch rail this morning here on Cape Cod in Massachusetts. It was a cool July morning and the insect was sluggish enough to pose for a good shot. Can you tell me what it is? And is it a biting insect? Its mouthparts remind me of those of a horsefly.
Signature: Tim Crowninshield

Robber Fly

Hi Tim,
We are starting to go cross-eyed we have looked at so many Flies on BugGuide, and like you, we haven’t a clue as to the identity of this stunning Fly.  Something makes us think it is a predator, and possibly a Robber Fly, but that is just a hunch.  We will try to contact Eric Eaton to see if he is able to assist in an identification.

Robber Fly

Daniel:
It is indeed a robber fly, Ommatius tibialis most likely:
http://bugguide.net/node/view/20271
That “bump” on the front margin of the wing is pretty diagnostic it would appear.
Eric

What's That Bug? does not endorse extermination
Location: Massachusetts

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