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dark-spotted brown bee fly - Dipalta banksi

dark-spotted brown bee fly - Dipalta banksi
Port Franks Forested Dunes, Lambton, Ontario, Canada
September 10, 2004
Size: about 9 mm
On trail in deciduous woods.

This might be a species of Dipalta. A key feature would be whether there is a crossvein between R2+3 and R4; I think I can see this. There are two species of Dipalta, D. serpentina and D. banksi. The only photo I can find on the internet of either is D. banksi on the "Dunes" poster at U of G which looks a lot like this fly. This species, the "Huron Shore Bee Fly" is ranked S1? by the NHIC. D. serpentina is much more widely distributed (see " class="bb_url">Catalog pt 3), but D. banksi seems like a good possibility for Port Franks.

Dipalta banksi
Thanks a bunch, Joel; I never would have found that U. of G. image! Jeff Skevington et al did intensive collecting throughout this area for 6 years (1991-96), and banksi was the only species of Dipalta collected: 7 specimens at the Pinery (adjacent to Port Franks) and 2 specimens at Kettle Point, as shown in this list. If D. serpentina had been present, they surely would have collected it, so I'm completely comfortable with calling this one D. banksi, the Huron Shore Bee Fly.

Yep -it's banksi
Dipalta is one of the few bee fly genera that are parasites of ant lions. It is the New World ant lion parasite counterpart to Micomitra in southern Europe and the Middle East.

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