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In the White Mountains of New Hampshire, USA July 27, 2011.

Dolichopodinae, possibly Gymnopternus is my ID.

He fluttered his wings. She stood still. He mounted her for a second then flew away. Possibly I disturbed them.


(Click for large size or view on Flickr.)

Another view of both (large JPEG) showing that the male has the large genitalia of Dolichopodinae: http://farm7.stat...d4ab_o.jpg

Another top view of male: http://farm7.stat...3b04_o.jpg.

After he left:

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Here is another fly from the same area. There were many Dolichopodidae on leaves. Possibly they were the same species.