h. Mesonotum flattened behind the transverse suture.
i. Posterior dorsocentrals inconstant and unequally developed; one pair of posterior inner dorsocentrals. P. terrænovæ. North America. Protophormia Town.
ii. Posterior dorsocentrals well developed, the inner dorsocentrals (acrostichals) unequally developed. P. azurea, chrysorrhœa, etc. Europe and America. Protocalliphora Hough
hh. Mesonotum not flattened behind the transverse suture; posterior inner and outer dorsocentrals inconstant and unequally developed. P. regina. Europe and America. Phormia R. D.
ee. Species more or less rufous or yellow in color.
f. Anterior dorsocentrals wanting; first section of the R4+5 at most only bristly at the base, bend near apex rectangular, R1 ends over the crossvein; fronto-orbital macrochæta absent; eyes of the male contiguous. C. semiviridis. Mexico. Chloroprocta V. d. W.
ff. With another combination of characters.
g. Body robust, of large size, abdomen elongate, not round; genæ with several ranges of microchætæ; vibrissal ridges strongly convergent; abdomen with well developed macrochætæ; costal spine usually absent; eyes of the male widely separated.
h. Peristome broad, pteropleural macrochætæ distinct; one or two sternopleurals; in the female a single orbital macrochæta; last abdominal segment without discal macrochætæ; hypopygial processes of the male with a long stylet; second abdominal segment of the female sometimes much elongate. A. luteola ([fig. 86]). Africa. The sub-genus Chœromyia Roub. is included here. Auchmeromyia B. B.
hh. Peristome narrow; no pteropleurals, two sternopleurals; two orbitals in the female; second segment not elongate; the fourth with two well developed discal macrochætæ. B. depressa. Africa. Bengalia R. D