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Syrphidae Criorhina - Criorhina nigripes - female

Syrphidae Criorhina - Criorhina nigripes - Female
Seattle, King County, Washington, USA
February 23, 2008


Moved from Criorhina.

I think I might of fudged thi
I think I might of fudged this one. I didn't have the experience then that I do now. I think this is actually C. nigripes. The basoflagellomere don't agree with C. coquilletti.

What do you think.

Taken from my Key

18. Third antennal segment produced far above level of second; sensory pit on lower part of inner surface minute, scarcely visible; tibiae and tarsi mostly reddish; male hind femora little enlarged; eyes separated by width of ocellar triangle; face without bare median line; coquilletti Williston

- Third antennal segment not produced dorsal above level of second, sensory pit large, distinct 19

19. Antenna black; legs black or at most with tibia bases obscurely reddish; face protruding far beyond level of antennal prominence; male face with a bare median stripe; eyes separated by more than width of ocellar triangle; hind femur slender, little greater in diameter than tibia; Western; nigripes (Williston)

- At least second antennal segment red; tibia red with a darker ring; tarsi red; face protruding only very little beyond level of antennal prominence; male face entirely pollinose; eyes separated by less than width of ocellar triangle; hind femur greatly swollen, diameter several times that of tibia; Eastern; verbosa (Walker)

I think it looks more like ni
I think it looks more like nigripes, although I am not 100% sure either....

I'm going to move this to C.
I'm going to move this to C. nigripes. I'm 99% certain. It has several characters that I associate with that species such as the all black limbs, black antenna and eyes in the male separated by greater than the width of the occ triangle.

Criorhina coquilletti
This one is a little harder to explain my reasoning. The small size of the fly restricts the species which it could be. This in combination with the haired cheeks indicates Criorhina coquilletti.

Nice!! Syrphidae Criorhina sp.
It's a female syrphid, and it belongs in the genus Criorhina!
There is just one other picture of this genus in Bugguide, which is another species as well! There are about 15 species in this genus in your part of the world.
It's difficult to give a species name, because the coloration is very variable, and not a good character to identify the species!

I have collected specimens in Oregon as well. Visit some alpine locations in the summer and you can find some huge specimens nectaring in Rhododendron blossoms. They are quite convincing bumble bee mimics: loud and large:-)

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