m. Wing with erect and microscopic setulæ. Widely distributed. (= Atrichopogon) Ceratopogon Meig.
mm. Wing with long and depressed hairs. Widely distributed. Forcipomyia
n. Hind metatarsus shorter or not longer than the following (i.e. the second tarsal) segment Subgenus Prohelea Kieff
nn. Hind metatarsus longer than the following segment. Subgenus Forcipomyia Meig.
ll. Empodium short, scarcely reaching the middle of the claws, or vestigial.
m. R-m crossvein wanting.
n. Palpi four segmented; inferior fork of the media obliterated at the base. Australia. Leptoconops Skuse
nn. Palpi three-segmented.
o. Legs spinulose, tarsal claws of the female with a basal tooth or strong bristle, those of the male unequal, the anterior with a long sinuous tooth, the posterior with a short arcuate tooth. Italy. Mycterotypus Noé
oo. Legs unarmed; no crossvein between the branches of the radius ([fig. 163e]). New Mexico. Tersesthes Townsend