p. Underside of the scutellum more or less sparsely covered with fine hairs; anal vein nearly always reaches the hind margin of the wing; extensor surface of the hind tibiæ with a number of stout setæ; squamæ often small and equal. Anthomyia, Chortophila, Eustalomyia, Hammomyia, Hylemyia, Prosalpia, Pegomyia, etc. Hylemyinæ-Pegomyinæ
pp. Underside of the scutellum bare; anal vein does not reach the wing margin.
q. First anal vein short, second anal suddenly flexed upwards; hind tibiæ each with one or two strong setæ on the extensor surface. Fannia (= Homalomyia), Cœlomyia, Choristoma, Euryomma, Azelia, etc. Fanninæ-Azelinæ
qq. Anal veins parallel or divergent.
r. Setæ on the exterior surface of the hind tibiæ wanting (except in Limnaricia and Cœnosites), lower squama not broadened to the margin of the scutellum. Leucomelina, Limnophora, Limnospila, Lispa, Mydæa, Spilogaster, etc. Mydæinæ-Limnophorinæ
rr. One (rarely more) seta on the extensor surface of the hind tibia; squamæ usually large and unequal. Hydrotaea, Aricia, Drymeia, Ophyra, Phaonia (= Hyetodesia), Pogonomyia, Trichophthicus, etc. Aricinæ
oo. M1+2 curved or bent, hence the cell R5 more or less narrowed in the margin. (Muscinæ). Muscidæ in part. See [page 303] for generic synopsis.
ll. Hypopleurals present; when three sternopleurals are present the arrangement is 2:1 or 1:1:1. (Tachinidæ of Girschner)
m. Conjunctiva of the ventral sclerites of the abdomen present, frequently well developed, surrounding the sclerites.
n. Mouth parts vestigial. Oestridæ. See [page 297] for generic synopsis.