Townsend — Genera of the Dipterous Tribe Sarcophagini. 191 



13 — Frontalia much narrowed posteriorly Agria RD. 



Frontalia not or but very slightly narrowed posteriorly ... 14 



14 — Vertex as wide as eye : . . . Miltoravinia, gen. nov. 



Vertex at most scarcely over two-thirds as wide as eye . 15 



15 — Postsuturals three Ravinia RD. 



Postsuturals four 16 



16 — Median marginals absent or vestigial on segment III .... 



Punasarcophaga T. 

 Median marginals present on segment III . Euravinia, gen. nov. 



17 — Postsuturals three . . 18 



Postsuturals four, the front two more or less reduced ... 19 



18 — Fifth sternite swollen and projected in profile like a button 



Hypopelta Aid. 



Fifth sternite normal Fletcherimyia, gen. nov. 



19 — Outer verticals well developed ; forceps minute (hind femora 

 and tibiae normally specialized for grasping the female in 



the genotype) ThelylepticocnemaT. 



Outer verticals not well differentiated from occipito-orbital 



fringe 20 



20 — Preacrostichals well developed, strong .... Kellymyia, gen. nov. 

 Preacrostichals not well developed, at most very small or 



vestigial 21 



21 — Frontalia not narrowed posteriorly 22 



Frontalia more or less narrowed posteriorly 23 



22 — Strong median marginals on segment III . . . Peltopyga, gen. nov. 



No median marginals on segment III Spirobolomyia T. 



23 — Cheeks over two-fifths of eye-length . . Trixosarcophaga, gen. nov. 



Cheeks not over one-fourth of eye-length 24 



24 — Hypopygium small ; forceps elongate and tapering . . Sarcodexia T. 

 Hypopygium rather large; forceps shortened and broadened 



apically, usually with a dorsal preapical spur 



Oxy sarcodexia, gen. nov. 



25— Preacrostichals present, well developed 26 



Preacrostichals not well developed, at most very weak, small 



or vestigial 30 



26 — Frontals not divergent, stopping close to base of antennae . 



Sarothromyiops, gen. nov. 

 Frontals diverging at least one bristle below base of antennae 27 



27 — Hypopygium wide, flattened, boxlike, the second segment 



very elongate ; forceps very short . . . Zygastropyga, gen. nov. 

 Hypopygium not flattened and boxlike, the second segment 



not unusually long 28 



28 — Strong erect median marginals on segment II ... Mulsantia RD. 



No median marginals on segment II 29 



29 — Facio-orbital row including 3 to 5 strong bristles below ; ver- 

 tex about one-half eye; cheeks about one-third eye-length, 

 paraf acialia about one-half width of clypeus ; long strong 

 macrochaetae in median longitudinal row on outside of 

 hind femora Boettcheria Pkr. 



