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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Flies (Diptera) » Orthorrhapha » Empidoidea » Longlegged Flies (Dolichopodidae) » Dolichopodinae » Gymnopternus or Hercostomus

Photo#208796

Copyright © 2008 John F. Carr

Fly

Burlington, Middlesex County, Massachusetts, USA
August 1, 2008
Size: 4 mm

On slime growing where water leaks out of rock. There were a few similar flies around.

Long-legged fly? It had a bit of that family's flash aversion, but less than I see in the ones who hang out on leaves.

Images of this individual: tag all

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Contributed by John F. Carr on 1 August, 2008 - 1:45pm
Last updated 20 February, 2023 - 1:24pm

Moved

Moved from Dolichopodinae.

… Zachary Dankowicz, 20 February, 2023 - 1:24pm

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Moved

Moved from Hercostomus.

… John F. Carr, 4 February, 2023 - 3:47pm

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Moved

Moved from Dolichopodinae.

… John F. Carr, 22 July, 2012 - 6:36pm

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Please

Could you please clarify the basis or identification as Hercostomus sp. here? I can't find the post on diptera.info, and from the key in the MND, I'm having trouble figuring out why this isn't Gymnopternus. R2+3 and R4+5 look essentially the same as in Fig. 29, showing G. spectabilis.

… Zachary Dankowicz, 4 February, 2023 - 3:06pm

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On diptera.info

See https://diptera.info/forum/viewthread.php?forum_id=5&thread_id=35246.

… John F. Carr, 4 February, 2023 - 3:42pm

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OK, thanks

Since Igor's suggestion seems rather tentative, and you also note in the comments some discrepancies with the venation, would it possibly be prudent to place this back to the subfamily?

On the other hand, do you have any more recent information that has moved you one way or another?

… Zachary Dankowicz, 4 February, 2023 - 3:46pm

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Moved

Moved from Longlegged Flies. diptera.info suggests Hercostomus, and of the Northeastern species of that genus H. chetifer is the only one it could be.

… John F. Carr, 25 December, 2010 - 9:18pm

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ID

You have it: Dolichopodidae.

… Andy Calderwood, 1 August, 2008 - 2:24pm

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