W. vigil - Wohlfahrtia vigil -

Collected in a pitfall trap at a restored prairie. Specimen in alcohol.

This fly is identifiable from the relatively bare antennae, pale tegula, posterodorsal apical metatibial bristle absent, yellow palpus and bare parafacial.

There is one Eastern species (W. vigil) and one Western species (W. opaca). I'm guessing the photos already in the guide can be IDed to species based on range. Related species are known to cause myiasis in children. There's a pretty gruesome photo on the internets of a child's eye infested with 23 of these maggots.

These are known parasites of fox and mink