Townsend — Genera of the Dipterous Tribe Sarcophagini. 193 



7 — Frontals not divergent, stopping practically at base of antennae 8 



Frontals diverging at least one bristle below base of antennae 10 



8 — First hypopygial tergite incised on median line posteriorly, 

 the hind edge of segment forming a wide vertical slit bor- 

 dered with partly decussate bristles; parafacialia rather 



broader than clypeus Argoravinia, gen. nov. 



First hypopygial tergite entire, not forming a vertical slit, 



parafacialia not as broad as clypeus 9 



9 — Vibrissal axis not over two-thirds of head-height 



Chaetoravinia, gen. nov. 



Vibrissal axis fully three-fourths of head-height 



Andinoravinia, gen. nov. 



10 — Vibrissal axis only a little shorter than head-height 



Tulaeopoda, gen. nov. 

 Vibrissal axis about or but little over two-thirds of head-height 11 



11 — Two reclinate fronto-orbitals Helicobia Coq. 



Only one reclinate fronto-orbital .... Sarcodexiopsis, gen. nov. 



12 — Postsuturals three 13 



Postsuturals two or four 20 



13 — Frontals not divergent, stopping practically at base of antennae 14 



Frontals diverging at least one or two bristles below base of 



antennae 15 



14 — Costal spine strong Sarothromyia BB. 



Costal spine absent Ravinia RD. 



15 — First hypopygial tergite excised or scooped out on disk ... 16 



First hypopygial tergite not excised or scooped out on disk . 17 



16 — Strong median marginals on segment II (yellow hair patch 



on outside of middle femora distally in genotype) Sarcotachinella T. 



No median marginals on segment II Bellieria RD. 



17 — Two reclinate fronto-orbitals; costal spine strong, longer 



than small crossvein Hypopelta Aid. 



Only one reclinate fronto-orbital; costal spine weak, short or 



vestigial, not as long as small crossvein 18 



18 — First hypopygial tergite incised on median line posteriorly, 

 the hind edge of segment forming a vertical slit bordered 



with partly decussate bristles Bercaeopsis, gen. nov. 



First hypopygial tergite entire 19 



19 — Facio-orbitals consisting of row of fine hairs ; lateral scutel- 

 lars two; median longitudinal row of macrochaetae on 

 outside of hind femora reduced to small bristles on basal 



half Fletcherimyia, gen. nov. 



Facio-orbital row including several strong bristles below ; 

 lateral scutellars three ; normally a median longitudinal 

 row of long strong macrochaetae on outside of hind femora 



for most of its length Boettcheria Park. 



20 — Preacrostichals present, well developed 21 



Preacrostichals absent or vestigial, not well developed ... 24 



