Subject: Type of fly?
Location: Chicago-area, Illinois, USA
June 24, 2012 12:52 pm
We saw this insect on my father’s water bottle and were fascinated and appalled in equal measure. As I took one entomology course in college, I was expected to instantly identify this mysterious bug. My response that it was a ”fly/wasp thing” did not impress. Please help me regain credibility,
Signature: Robin

Robber Fly

Hi Robin,
This is a predatory Robber Fly, and we believe we have correctly identified it as
Efferia aestuans thanks to images posted on BugGuide.  Since it is lacking an ovipositor and has a tufted abdomen, we can conclude that this is a male.

Robber Fly

Location: Illinois

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