Diptera.info :: Identification queries :: Diptera (adults)
 Dolichopus albicoxa
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| John Sankey |
Posted on 23-05-2012 16:44
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Member Location: Ottawa Canada Posts: 160 Joined: 24.04.12 |
23 May 2012 length 4 mm John Sankey attached the following image:  [70.36Kb] Edited by John Sankey on 15-10-2012 21:39 |
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| John Sankey |
Posted on 23-05-2012 16:45
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Member Location: Ottawa Canada Posts: 160 Joined: 24.04.12 |
head
John Sankey attached the following image:  [61Kb] |
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| Stefan Naglis |
Posted on 23-05-2012 16:49
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Member Location: Switzerland Posts: 738 Joined: 27.12.08 |
Dolichopus sp. |
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| John Sankey |
Posted on 23-05-2012 20:16
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Member Location: Ottawa Canada Posts: 160 Joined: 24.04.12 |
Thank you, Stefan. What additional details are needed to have a chance of IDing it to species? |
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| Stefan Naglis |
Posted on 24-05-2012 06:53
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Member Location: Switzerland Posts: 738 Joined: 27.12.08 |
Hello John! I suggest to ask a Canadian Dolichopodidae specialist. Stefan |
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| Igor Grichanov |
Posted on 24-05-2012 07:14
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 Member Location: St.Petersburg, Russia Posts: 1821 Joined: 17.08.06 |
Dolichopus aff. abruptus Aldrich, 1922 157.-Front tarsi with one or more segments compressed..................... 158. Front tarsi plain............................................ 162. 158.-Hind femora ciliated below............................................ 159. Hind femora without cilia............................................ 160. 159.-Front coxae yellow (Alaska) ........ ................ brayenemus Coquillett. Front coxae wholly black (British Columbia) ..... ...... nigricoxa Van Duzee. 160.-Front tarsi blacK from the tip of first segment (Colorado) .... elegans Aldrich. Front tarsi with at least first two segments yellow....................... 161. 161.-Front tarsi black from middle of third segment, first three segmentsvery slender, last two forming an oval, broadly fringed tip to tarsi (Maine; Massachu- Eetts; New Jersey) ................................. virga Coquillett. First two segments of front tarsi yellow, last three black, last two segments distinctly flattened, a little widened laterally, but not fringed; hind femora and tibiae each blackened on apical third (New York). abruptus Aldrich. Igor Grichanov |
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| Stefan Naglis |
Posted on 24-05-2012 07:35
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Member Location: Switzerland Posts: 738 Joined: 27.12.08 |
Igor, which key have you used? John, could you make a photo from the ventral side of the hind femur. It looks like ciliated. Stefan |
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| John Carr |
Posted on 24-05-2012 12:30
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 Super Administrator Location: Colorado, USA Posts: 10662 Joined: 22.10.10 |
He is using the key by Van Duzee and Curran, American Museum Novitates 683 (1934). Using that key I got Dolichopus albicoxa as the closest match. That species differs in extent of darkening on hind tibia and possibly in some hair colors. http://books.goog...p;pg=PA165 I took the hind femur not to be blackened at apex, merely slightly darker brown, but if it is blackened the branch above leads nowhere. Edited by John Carr on 24-05-2012 12:30 |
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| John Sankey |
Posted on 24-05-2012 13:25
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Member Location: Ottawa Canada Posts: 160 Joined: 24.04.12 |
Stefan, this is the best I can do, propping it up between two #0 pins. I haven't been able to find a source of proper minims (Bioquip is out of stock, and in any case charges outrageous shipping to Canada) - do you know of a European source that would mail me a small package of something like 0.1 mm or 0.15 mm? (also #000 pins would be great for things this small.)
John Sankey attached the following image:  [76.99Kb] |
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| Stefan Naglis |
Posted on 26-05-2012 10:19
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Member Location: Switzerland Posts: 738 Joined: 27.12.08 |
I have identified the specimen as Dolichopus albicoxa Aldrich using the keys to North American Dolichopus (Van Duzee & Curran 1934, Van Duzee, Cole & Aldrich 1921).
Edited by Stefan Naglis on 26-05-2012 11:49 |
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| John Sankey |
Posted on 26-05-2012 11:23
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Member Location: Ottawa Canada Posts: 160 Joined: 24.04.12 |
Many thanks, all. I'm trying to get access to our local entomological library, when I expect to find Diptera merely difficult instead of impossibly confusing! |
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| Stefan Naglis |
Posted on 26-05-2012 11:54
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Member Location: Switzerland Posts: 738 Joined: 27.12.08 |
John, I suggest to complete the title with the species name. Stefan |
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| John Sankey |
Posted on 26-05-2012 12:27
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Member Location: Ottawa Canada Posts: 160 Joined: 24.04.12 |
Done. Many thanks again. |
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| John Carr |
Posted on 27-05-2012 02:30
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Super Administrator Location: Colorado, USA Posts: 10662 Joined: 22.10.10 |
Stefan -- do you think it matches the description of the species within typical variation? The hind tibia is darkened more than the description says. The fore leg with enlarged tarsomeres 4 and 5 matches, but that's a common modification and there may be some other species with identical ornaments. |
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| Stefan Naglis |
Posted on 27-05-2012 09:57
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Member Location: Switzerland Posts: 738 Joined: 27.12.08 |
John, I think this is within the range of variation. "... still always distinctly blackened on inner side" Stefan |
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