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Photo#879259
Sphecid - Physocephala furcillata

Sphecid - Physocephala furcillata
Fredericton, York County, New Brunswick, Canada
July 14, 2010

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Sphecid - Physocephala furcillata Sphecid - Physocephala furcillata Sphecid - Physocephala furcillata Sphecid - Physocephala furcillata

Moved
Moved from Physocephala.

This comes tantalizingly close...
...to showing enough of the cheek to help discern species..but not quite there! (Ughh :-)

If the entire cheek (= lower part of head below eye up to the edge of the mouth) were dark blackish, that would cinch furcillata. If the cheek were dark at its forward and hind edges, and pale yellow in a quadrate area in between, that would indicate marginata. I see a bright yellow dot there, but I think that's just a specular highlight off the base of the mouthparts. At any rate, not enough is visible for me to make a clear determination from that.

Nevertheless, scrutinizing the 1st image of your series once more, I'm again leaning heavily towards furcillata here, due to the apparent lack of the characteristic pollinose marking on the side of the thorax that would be present in marginata. In fact, the pleura are rather reddish, in accord with characters of furcillata.

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