Robber Fly with Prey

Subject: Blue-eyed Robber Fly (Megaphorus megachile?)
Location: Yallowstone National Park, Wyoming
August 17, 2013 3:14 pm
Hi Daniel!
Just back from Yellowstone/Grand Teton – a spectacular vacation. I saw lots of beautiful winged creatures, but this little blue-eyed fly caught my attention. I am pretty sure it’s a robber fly, and I am pretty sure it’s clutching some prey. I apologize for the bad photo, but it let me get one shot from a distance before it took off. I hope all is well with you!
Signature: Dori Eldridge

Robber Fly with Prey
Robber Fly with Prey

Hi Dori,
We cannot say for certain which species of Robber Fly you have photographed, however we do agree that based on images posted to BugGuide, this looks very similar to the members of the genus

2 thoughts on “Robber Fly with Prey”

  1. Hi there, Dori! I was in Yellowstone and Grand Tetons at almost the same time you were, and also saw some of these robber flies. I was always glad to see them hanging around, because they provided some measure of protection against the numerous biting flies. In fact, once I was sitting outside and a robber fly decided to use me as a base of operation, perhaps because my presence was drawing in nasty bloodsucky things. Every time a biting fly buzzed nearby, the robber fly launched itself off its perch on my leg and went chasing after it. I didn’t get bitten even once that evening. Anyway, thanks for bringing back memories for me! Hope you had lots of fun on your trip.

  2. It was pretty small. I would say your 5mm is about right.
    Suddenly, they are all over my wife’s garden and seem to enjoy dining at the edge of day-lily petals.
    Also, once they have something to eat, they stay put long enough to line up a nice shot. I used a macro lens that required getting about two inches from the subject with a flash held six inches above, and got several shots. I’m wondering if its brain doesn’t have enough circuitry to flee and eat at the same time.


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