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Photo#435193
Big fly - Promachus vertebratus - male

Big fly - Promachus vertebratus - Male
Somme Prairie Nature Preserve, Northbrook, Cook County, Illinois, USA
July 31, 2010
Size: ~26mm
Several of these big flies resting in the prairie vegetation but didn't allow close approach.

Moved
Moved from Robber Flies.

Male
Promachus, probably vertebratus.

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