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 Beach fly 2013-VIII-18 (= Proctacanthus coquillettii)
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| John Carr |
Posted on 06-09-2013 13:29
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 Member Location: Massachusetts, USA Posts: 10176 Joined: 22.10.10 |
On a beach in California, USA near the Mexican border. August 18, 2013.
John Carr attached the following image:  [169.95Kb] Edited by John Carr on 07-09-2013 00:18 |
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| Eric Fisher |
Posted on 07-09-2013 00:05
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 Member Location: California Posts: 435 Joined: 19.05.06 |
Proctacanthus coquillettii, male. Nice shot of this sand dune-loving fly limited to the southern part of the Colorado River drainage. |
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| John Carr |
Posted on 07-09-2013 00:18
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Member Location: Massachusetts, USA Posts: 10176 Joined: 22.10.10 |
Thanks. Is beard color sexually dimorphic? I also saw a robber fly with white beard. |
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| Eric Fisher |
Posted on 13-09-2013 08:19
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Member Location: California Posts: 435 Joined: 19.05.06 |
Yes, the female has a white beard and the body is paler in color (being gray, with the apex of the large ovipositor shiny black). The wings of the male have a large brown spot that covers most of the middle third of the wing, while the female has nearly entirely clear wing, with just a faint brown shadow in the middle third. Some males of Proctacanthus coquillettii have whitish beards. The intensity of the yellowish-orange color hairs in your male fly seems unusual, and most males have these hairs a much paler yellow color or even white. |
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