Thread subject: Diptera.info :: Dolichopodidae 2008-VIII-1 (= ? Hercostomus)
Posted by John Carr on 24-12-2010 22:20
#1
Massachusetts, USA, on a slime covered seep. About 4 mm long.
Edited by John Carr on 05-12-2011 03:40
Posted by John Carr on 24-12-2010 22:22
#2
And now with a picture the site will accept as an upload...
Posted by John Carr on 24-12-2010 22:23
#3
Head
Posted by John Carr on 24-12-2010 22:24
#4
Wings. C is short on right wing, normal length on left.
Posted by Igor Grichanov on 25-12-2010 23:57
#5
Keep it temporarly as
Hercostomus sp.
Posted by John Carr on 05-12-2011 03:39
#6
If this is
Hercostomus it should be
H. chetifer (Walker). In the regional key by Robinson (1964) that is the only species with the combination of pale femora, abdomen without yellow, and fourth vein sinous beyond crossvein. I only have this photo of a female and can not check the male fore tarsus where the secondary sexual character is found.
Edited by John Carr on 05-12-2011 04:02
Posted by John Carr on 05-12-2011 03:47
#7
Let me add the wing does not agree closely with the illustration in the description of the synonym
Paraclius ornatus Van Duzee 1921 (
http://psyche.ent...28-120.pdf). That species has M bent more gradually forward and R4+5 more backwards so they end closer together. His description notes "This female is easily recognized by its venation, together with the silvery front and yellow proboscis and ovipositor."