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Photo#275147
Bee fly over Ammophila burrows - Thyridanthrax - female

Bee fly over Ammophila burrows - Thyridanthrax - Female
Fort Lowell Park, Tucson, Pima County, Arizona, USA
May 11, 2009
This female bee fly was frequenting the nesting area of the Ammophila wasps posted from the same location on the same day (Ft. Lowell Park, Tucson, AZ, May 11, 2009). She was hovering over open burrows and lobbing eggs down the tunnels. Don't know if this represents a host record...I could never get a shot of the bee fly perched.

Thyridanthrax
This is Thyridanthrax, and quite possibly T. fenestratoides, although I'm not familiar with all of the Nearctic species in the genus. Members of this genus have been recorded parasitizing sphecids before, but I don't have any details on which species were involved so I can't say if this particular association has been recorded.

 
Wow.
Thank you so much, Joel. I'd never even heard of the genus until just now. Awesome! Maybe I'll go back and see if I can get some better shots (though I'm somewhat pressed for time these days).

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