Thread subject: Diptera.info :: Tachinidae USA 2009-VII-9 (= Siphonini)
Posted by John Carr on 06-11-2011 23:23
#1
Massachusetts, USA July 9, 2009.
(Click to enlarge or view
on Flickr.)
Edited by John Carr on 07-11-2011 14:50
Posted by ChrisR on 07-11-2011 12:01
#2
Oh, very nice ... looks like a North American species of
Siphona :) Definitely a siphonine (converging sub-apicals, hairy r4+5 and general habitus) ... not sure how easy they are to identify in the nearctic but they are probably very difficult ;)
Posted by John Carr on 07-11-2011 14:47
#3
I tried the key to
Actia (Curran, 1933) and if in that key it would have to be
Actia atripes (
Coquillett, 1897) based on the mostly bare veins. The description is close. It was described from Massachusetts and represented by only the type specimen as of 1933. The name does not appear in the nadsdiptera.org catalog, even as a synonym.
I have not seen the revision of
Siphona by O'Hara (1982).
Posted by ChrisR on 07-11-2011 15:19
#4
Did Curran distinguish between
Siphona and
Actia? This one seems to have a long, hinged proboscis so would be
Siphona under a modern interpretation :)
Posted by John Carr on 07-11-2011 15:43
#5
Curran's
Actia contains at least four genera now. The key in Manual of Nearctic Diptera distinguishes
Siphona and
Ceranthia from the rest by "A1 ending at wing margin." This fly's A1 appears to be short, but a fold may reach the wing margin.
Then
Siphona and
Ceranthia are distinguished by proboscis. The key says
Actia and
Ceromya both have "R4+5 setose from base to well beyond crossvein r-m", which is not the case here. Another picture shows more clearly that there are no bristles in the out of focus part of the vein.
Edited by John Carr on 07-11-2011 15:44
