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Bird Hover Fly - Eupeodes volucris - male

Bird Hover Fly - Eupeodes volucris - Male
Desert Botanical Garden, Maricopa County, Arizona, USA
March 9, 2005
Size: Circa 12 mm
These syrphids were quite common about blooming Asteraceae at the Desert Botanical Garden and in other locations near Phoenix in early March. The shape of the abdomen sure is odd. I was unable to determine if this might be a sex difference--all the flies I saw had this odd shape.

Thanks to comments below from Gerard Pennards--this is Eupeodes volucris, abdomen indicates it is a male.

Eupeodes volucris male
Hello Patrick,
Very interesting!! It is for sure a member of the subfamily Syrphinae, and by the look of its spots on the abdomen and the shiny thorax, combined with the shape of the abdomen, I'm convinced that this is a male of Eupeodes volucris.
You probably have seen only males, because in females thye abdomen has a normal shape.
In fact in Europe we also have a species that is easily identified because the males have a big genital apparatus.
But in this species it is much bigger, even so that it gives the last segments of the abdomen this elongated shape.
Gerard Pennards