Length: fly in photo 5.8 mm
Two traits that are often encountered in subfamily Clitellariinae are (1) two spines along the margin of the scutellum, and (2) a convex face, somewhat conical. The latter trait is most easily seen in profile.
Diaphorus is a Neotropical genus with no records as yet from north of Costa Rica.
Males (shown) are holoptic.
Photo location: Cartago province, Costa Rica.