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Photo#1065276
Syrphidae (2) - Copestylum violaceum

Syrphidae (2) - Copestylum violaceum
Green Valley, Madera Canyon, Santa Cruz County, Arizona, USA
May 8, 2015
Size: 8mm
1645m above sea level

Images of this individual: tag all
Syrphidae (2) - Copestylum violaceum Syrphidae (2) - Copestylum violaceum

Moved
Moved from ID Request.

Copestylum violaceum.
Wing alula clear of microtrichia on at least distal third.
Copestylum violaceum.

 
Is the alula on this genus that isolated circular attachment?
I have not been able to match the wings of this genus to any Diptera wing diagram. Where the alula "should" be seems to be nothing on Copestylum. My only guess to what the alula equivalent is on these flies is my question above.

 
the alulae are sticking out f
the alulae are sticking out from the plane the wing is in and are reflecting the light, so they are kind of white. Here is a good wing diagram where you can see these structures: http://delta-intkey.com/britin/syr/terms02.htm

 
Thanks Martin
Now the real question -- do you know where I can see photos of alula of mexicanum and violaceum? We have so many under mexicanum on guide where I can't really tell whether it is dark or just the body showing behind.

I'm looking at spread wings of our local ones in Orange County California and they all have the 2 transverse alula veins darkened, but otherwise it is clear.

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