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Fly - Microdon

Fly - Microdon
Elkton, Douglas County, Oregon, USA
May 31, 2009
Size: approx 6mm
On Himalayan Blackberries. Syrhid? Microdon?

Moved from Flies.

Microdon looks good, but I'm no expert.
Did you see this post? You could have something important here, though it was a couple years ago. Suggest you contact Tom and Herschel for updates.

For several weeks, these flies were concentrated around what's left of an old, dead willow that has a carpenter ant colony. I've seen these flies for several years, shortly after the carpenter ants took over the stump. At first I thought they were bees because of how they flew. I'll check tomorrow and see if they're still around.

I've just posted several more images of a second specimen taken two days later.

That is a very nice fly.
And a fine series of photos for the guide.

Went looking,
didn't find any. But I think Eric's comment explains why - they nest with carpenter ants and (I assume) emerge (based on my image dates) in late May, early June. Guess I'll have to wait for next year's hatching.

Regarding your earlier comment: I'll add a link to Tom's post and hope he and Herschel are still subscribed.

Good idea.
If that doesn't pay off, you can reach both by email; check their profiles. And apparently Gary Alpert can be googled for his address.

No question. Further, the larvae live in ant nests, preying on the ant larvae and pupae.

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