Moved from Ogcodes.

This goes unambiguously to the widespread and somewhat variable species O. eugonatus in the key to nearctic Ogcodes on pg. 274 of Schlinger (1960). It goes to "O. marginatus" (=O. eugonatus) in the key for Ogcodes on pg. 61 of Cole (1919).

The relatively wide posterior white fasciae on the terga indicate this is a male. (The correspondence of relatively wide vs. narrow fasciae to male vs. female Ogcodes was first recognized in Sabrosky (1944)).

Critical characters for the "marginatus" form of O. eugonatus include:

1) Wing vein M1 absent (see 2nd image);
2) Cross vein m-cu absent (see 2nd image);
3) Fairly wide white posterior fasciae on the terga...and even wider on the sterna (nearly filling them)...with fasciae in both cases tapering abruptly near the lateral edges;
4) Tarsi and basal 2/3 of femora dark, tibiae mostly yellowish;
5) Relatively long, whitish pile on thorax and abdomen;
6) Squama (large membranous disk at base of wing) whitish with a pale rim and a narrow hyaline space between the rim and the opaque whitish central disk (see description of O. marginatus on pg. 67 of Cole).

Moved from Small-headed Flies.