Collected with a carrion baited pitfall trap at a sand prairie. Specimen in alcohol.

I'm having a hard time deciding on who this fly is. The alcohol has distended the abdomen, so it doesn't quite match up with the key in the MND. The face is elevated below, producing a ridge under the antennae. This excludes Sphaerocera. The choice between Mesosphaerocera and Parasphaerocera is based on the relative length of the intermembranous areas, which are distorted in this specimen from the alcohol. Comparing the specimens already in bugguide, this seems closer to Meso than Para.