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View Thread :: Identification queries :: Diptera (adults)
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Dolichopodidae from USA
#1 Print Post
Posted on 17-08-2019 20:32

Location: Zaragoza, Spain
Posts: 1868
Joined: 26.04.07

Boston, Massachusetts.
24th July 2019.
On a wooden fence that divides a forest from a park.
Any help with ID appreciated! Thanks!
John Carr
#2 Print Post
Posted on 18-08-2019 01:58
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Location: Massachusetts, USA
Posts: 7468
Joined: 22.10.10

Dolichopus or Gymnopternus
#3 Print Post
Posted on 18-08-2019 07:11

Location: Zaragoza, Spain
Posts: 1868
Joined: 26.04.07

Thanks, not possible to distinguish between both genus?
John Carr
#4 Print Post
Posted on 18-08-2019 19:23
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Location: Massachusetts, USA
Posts: 7468
Joined: 22.10.10

If there are bristles on the hind basistarsis and vein M is bent abruptly in the middle of the last section as seen from above, Dolichopus. If the hind basitarsus is bare and vein M is nearly straight in the middle, Gymnopternus. What I can see of the color, bronze stripe on thorax and pale lower postocular hairs, is more typical of Dolichopus. Also, Gymnopternus usually has a row of short bristles on the fore tibia where long bristles are visible.
#5 Print Post
Posted on 18-08-2019 22:00

Location: Zaragoza, Spain
Posts: 1868
Joined: 26.04.07

s Joh, I fear that the hind tarsi are not enough in focus for distinguish the bristles. If generic identification is nearly impossible I suppose that specific ID will be much so.
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