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Photo#404196
Thick-headed Fly - Physocephala burgessi

Thick-headed Fly - Physocephala burgessi
Fremont, Alameda County, California, USA
June 2, 2010
Size: ~2cm
When I shot it, I thought it was a dark-winged Crane Fly. Obviously not. On Fennel.

Images of this individual: tag all
Thick-headed Fly - Physocephala burgessi Thick-headed Fly - Physocephala burgessi

Moved
Moved from Conopinae.

Moved
Moved from ID Request.

Conopidae -
Looks very much like Physocephala burgessi.

 
Thick-headed Fly
Like yours?:


Thanks for the id!

 
Yes, Alice, quite sure this
is the same species. Some unusual P. texana can be somewhat similar, but have dorsum of thorax mostly black, and the red is not as full and dark as in burgessi.
Interesting to see this from your area. Bombus sonorus is a known host, & I bet others as well.

 
Bumblee Bee Host
Hartmut,
Can you tell me more about Bumble Bees hosting flies? Do they carry eggs? Sounds interesting :)

Oh, I see this in Thick-headed Fly Info:

"Larvae are endoparasites, chiefly of adult bumblebees and wasps. Adults take nectar."

"Flies oviposit on hosts during flight. Larvae feed on bumblebee, wasps, etc."

Cool!

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