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. M_{1+2} curved or bent, hence the cell R_5 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)