oo. Palpi small, globular; tibiæ cylindrical, straight. On reindeer. _O. tarandi_ _Oedemagena_ Latr. kk. Oral opening of the usual size; mouth parts not vestigial. l. Hypopleurals wanting; if three sternopleurals are present the arrangement is 1:2; conjunctiva (fig. 161c) of the venter usually present; if the terminal section of M_{1+2} is bent it has neither fold nor appendage (ANTHOMYIIDÆ of Girschner). m. Sternopleurals wanting; M_{1+2} straight toward the apex, costa ends at or slightly beyond the tip of R_{4+5}; mouth parts vestigial. GASTROPHILINÆ. See OESTRIDÆ mm. Sternopleurals present, if rarely absent then differing in other characters. n. Caudal margin of the fifth ventral abdominal sclerite of the male deeply notched on the median line usually to beyond the middle; abdomen often cylindrical or linear; abdomen often with four to eight spots; eyes of the male usually widely separated; sternopleurals three, arranged in an equilateral triangle; subapical seta of the hind tibia placed very low; M_{1+2} straight; anal vein abbreviated; wings not rilled. _Cænosia_, _Caricea_, _Dexiopsis_, _Hoplogaster_, _Schœnomyia_, etc. (CŒNOSINÆ)[K]. ANTHOMYIIDÆ in part nn. Caudal margin of the fifth ventral abdominal sclerite of the male incurved, rarely deeply cleft, rarely entire, in a few genera deeply two or three notched; M_{1+2} straight or curved; abdomen usually short or elongate oval; sternopleurals, if three are present, arranged in the order 1:2 in a right triangle. (MUSCINÆ-ANTHOMYIINÆ of Girschner) o. M_{1+2} straight, hence cell R_5 not narrowed in the margin. ANTHOMYIIDÆ in part