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Massachusetts, USA July 3, 2012

To my eye this looked exactly like Hydrophoria lancifer but on closer examination of the photo I see

1. The frons is yellow.
2. The tibiae are black.
3. There is only one pair of postsutural acrostichals instead of two.
4. M-cu crossvein is more strongly curved.

It was also in an unusual place, at the edge of a field instead of in the woods.

I couldn't get a lateral shot.


(Click to enlarge or view on Flickr.)

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I think H. lancifer is OK here. The all-yellow frons is just newness. It is hard to judge the colour of the tibiae at this angle - they would probably be more translucent in dorsal view. Do you have any other Hydrophoria species with black femora and a long pre-alar?