ii. Base of the antennæ dorsad of the middle of the eye; eyes of both sexes distinctly separated; dorsal surface of the squamula thoracalis with black hairs; two postsutural intraalar macrochætæ. j. Hypopygium of the male large, with a pair of slightly curved forceps whose ends are concealed in a longitudinal slit in the fifth ventral sclerite; third posterior inner dorso-central (acrostichal) macrochætæ absent; anterior intraalar rarely present; abdomen usually not pollinose; the second segment without median marginal macrochætæ; face yellow. _C. mortuorum_, _cadaverina_, and related species. Both hemispheres. _Cynomyia_ R. D.[O] [Illustration: 170. Sepsis violacea; puparium and adult. (See page 297.) After Howard.] jj. Three pairs of posterior inner dorsocentrals (acrostichals) present; second abdominal segment with a row of marginal macrochætæ; genæ hairy, at least above. k. Hypopygium of the male with a projecting style. _S. stylifera_. Europe. _Steringomyia_ Pok. kk. Hypopygium of the male without style. _A. stelviana_ B. B. _Acrophaga_ B. B. hh. Arista usually plumose nearly to the tip; posterior dorsocentrals and inner dorsocentrals (acrostichals) well developed; dorsal surface of the squamula thoracalis hairy; abdomen metallic and usually pollinose; genæ hairy. i. With one pair of ocellar macrochætæ. C. VOMITORIA, ERYTHROCEPHALA, VIRIDESCENS, and related species. Both hemispheres. CALLIPHORA R. D. ii. With two strong pairs of ocellar macrochætæ. _E. latifrons._ Pacific slope of the U. S. _Eucalliphora_ Town. ff. First section of R_{4+5} bristly near or quite half way to the small crossvein; dorsal surface of the squamula thoracalis is bare; the hypopygium of the male is inconspicuous. g. Genæ bare; posterior inner and outer dorsocentrals distinct and well developed. _L. cæsar_, _sericata_, _sylvarum_, and related species. Widely distributed in both hemispheres (fig. 103). LUCILIA R. D. gg. Genæ with microchætæ, at least down to the level of the base of the arista. h. Mesonotum flattened behind the transverse suture.