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Seen in Connecticut, USA morning of June 19, 2010. My ID is Sciapodinae by wing venation and leaf-perching habit, probably Chrysosoma based on long antennae.

More and larger pictures at http://www.flickr...24/detail/.

Edit: Looks like I can't upload pictures here for some reason. Link above has them.

Edit 2: But I can inline an image

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How about Condylostylus?

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According to the key in Manual of Nearctic Diptera, Condylostylus would have shorter antennae.

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Sorry... okay so we do agree! I was using Robinson who treats the genus as
part of Condylostylus Bigot.

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Can you rule out Sciapus? I don't understand the difference between Sciapus and Condylostylus.

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Condylostylus Bigot. Chrysosoma Guerin-Meneville is not present in North America.

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Robinson and Vockeroth keyed Chrysosoma in Manual of Nearctic Diptera stating that three species were present in eastern North America formerly considered to belong to Condylostylus. Have the generic limits or assignments changed since 1981? What's a more recent reference?

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7. Frons of both sexes with raised setose mound bearing strong vertical seta; M) beyond M2 usually sharply recurved basad (Fig. 124c); both pairs of scutellar setae long; wing often with dark brown bands, sometimes enclosing clear window; arista dorsal to dorsoapical; pedicel with long dorsal and ventral setae; both sexes with 4-5 strong dc; hypopygium often rather small (New World, Afrotropics, Orient, eastern Polynesia) ....................................................................................... Condylostylus

Condylostylus contains approximately 308 described
species, with 230 Neotropical (including the Galapagos,
and with one species extending into eastern Polynesia),
30 Nearctic, 15 common to both regions, 11 Afrotropical,
and 22 Oriental and far-eastern Palearctic species

See Bickel, Daniel J., 1994. The Australian Sciapodinae (Diptera:
Dolichopodidae), with a review of the Oriental and Australasian faunas,
and a world conspectus of the subfamily. Records of the Australian Museum,
Supplement 21: 1–394.
www.australianmuseum.net.au/publications

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Thanks. I had seen the title of that paper before without noticing that it contained the current and significantly-changed classification of Sciapodinae worldwide.

I don't see the vertical setae arising from setose mounds in my fly, but I do see the other characters.

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After more reading, I identified this as Condylostylus comatus (Loew). Species characters among North American Condylostylus are long, unmodified antennae, row of hairs on fore tarsus, row of short bristles on mid tarsus, and pale tip of genitalia.