Moved from Syrphid Flies.

Many pictures are good! This allowed me to get it to species - a new species for BugGuide, in fact, Copestylum tamaulipanum.

Keys out in Curran 1939 as follows:

1b, scutellum flattened to convex
48b, no prescutellar bristles
105b, ground color of abdomen not concealed by pile
106a, marginal cell broadened apically
107b, margin of scutellum with hairlike bristles
114b, face concave, wings with brown bands, marginal cell bulbous at apex
120b, mesopleura blackish
129b, scutellum with black pile
132a, legs black
133a, pleura yellow pilose
133aa, face with median black vitta -> Volucella feminina = Copestylum tamaulipanum

I went ahead and looked at the original descriptions of Volucella feminina Curran 1930 (later synonymized as C. tamaulipanum) and Volucella tamaulipana Townsend 1898 (later put into Copestylum), and the description fits to a T; I was a bit worried as Curran 1930's description of the abdomen notes a largely black color, but Townsend 1898 notes that the abdomen is "a general yellowish brown" and is lighter/more yellowish in the female.

Hooray!

To be honest, when you aren't certain, I'd personally rather have more photos than fewer!

Moved from Flies.