Giant Robber Fly

What is this?
Location: Boulder, CO — Rocky Mountain foothills
June 30, 2011 10:38 pm
I ran across this insect while hiking in the hills around Boulder, CO. It’s about the size of my insect finger, and it flies as well. Otherwise, the picture should give you all the details you need.
Signature: IngridM

Giant Robber Fly

Hi IngridM,
This is one of the Giant Robber Flies in the genus Promachus.  The species that are pictured on BugGuide all look quite similar and we do not feel confident taking the identification to the species level.

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