Robber Fly

Subject: Robber Fly species ID please?
Location: Merrimac MA
July 30, 2017 8:07 pm
Attached is a photo of a Robber Fly in our yard in Merrimac, Massachusetts in July, 2017. We would like to know what species it is. We had never seen one before, but we are only about 30 minutes from Reading, MA where evidently the mail trucks seem to be a favored spot to hitchhike!
Thank you!
Signature: Bonnie

Robber Fly: male Efferia aestuans

Dear Bonnie,
This looks to us like a male
Efferia aestuans, and according to BugGuide: “The most likely robber fly to land on humans.”

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