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View Thread :: Identification queries :: Diptera (adults)
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Flies entering sand wasp (Bembicini) hole
#1 Print Post
Posted on 28-01-2021 16:47
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Location: West Virginia USA
Posts: 1320
Joined: 12.04.05

Terrible small photos, but maybe someone will recognize the behavior.

These flies were numerous around some gregarious sand wasps (Crabronidae: Bembicinae), and entered their holes when the wasps were not present. The wasps were, I believe, Stictia signata.

Any thoughts about the family of fly?

U.S. Virgin Islands (St. Croix), sandy beach about 15 meters from the ocean beach. Sand with patchy grass.

I believe (by memory) the flies were about 3-4 mm long.
Edited by Stephen on 28-01-2021 16:50

Stephen Cresswell
#2 Print Post
Posted on 28-01-2021 16:48
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Location: West Virginia USA
Posts: 1320
Joined: 12.04.05

Another photo, showing the entrance to the wasp burrow.

Stephen Cresswell
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Posted on 28-01-2021 17:00

Posts: 43
Joined: 14.10.19

Hi, my first thought was Chloropidae. And indeed, it seems that your picture fits well to Liohippelates known as cleptoparasitic on Stictia signata.
Edited by Xylosoma on 28-01-2021 17:03
#4 Print Post
Posted on 29-01-2021 19:31
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Location: West Virginia USA
Posts: 1320
Joined: 12.04.05

Thanks, Xylo. Looking further into my files, I found a better photo and notes that the length was 2.2 mm to the wing apex.
Edited by Stephen on 29-01-2021 19:31

Stephen Cresswell
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Looking for material? See here: https://diptera.i.

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