314 Hominoxious Arthropods 



mucTi elongate. A. luteola (fig. 86). Africa. The sub- 

 genus Choeromyia 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 macrochaetae. 



B. depressa. Africa Bengalia R. D 



gg. With another combination of characters. 



h. Costal spine present; body in part black; antennas notice- 

 ably shorter than the epistome, inserted above the middle 

 of the eye and separated from each other by a carina; 

 abdominal segments with marginal macrochaetae; sterno- 

 pleurals 2 :i or i :i Paratricyclea Villen. 



hh. Costal spine not distinct, or if present, insect otherwise 



different. 



i. Genae with several ranges of microchaetae; vibrissal ridges 

 strongly converging; peristome broad; arista moderately 

 plumose; sternopleurals usually i:i; color entirely 

 testaceous. C. anthropophaga (fig. 87) and grunbergi. 



Africa Cordylobia Grunb. 



ii. Genas bare or with but one range of setae; vibrissal ridges 

 less converging; peristome narrow; arista long plumose, 

 j. Genae with a single row of microchaetae. 



k. Sternopleurals 2:1; color entirely testaceous 



Ochromyia Macq.* 



kk. Sternopleurals 1:1. P. varia Hough. Africa 



Parochromyia Hough 



jj. Genae bare. 



k. Basal section of R4+s bristly only at the immediate 

 base, distal section with a broad curve; distal 

 portion of the abdomen metallic; sternopleurals 

 usually i :i, rarely 2:1. M. ceneiventris Wd. Tropic 



America Mesembrinella. G. T. 



kk. R4+5 bristly at least nearly half way to the small 

 crossvein; sternopleurals 1:1. 



I. Macrochaetae of the abdomen marginal; neither sex 



with orbitals; no carina between the base of the 

 antennae; three pairs of presutural inner dorso- 

 centrals. Eastern hemisphere. T. ferruginea. 

 Tricyclea V. d. W. (= Zonochroa B.B. according 

 to Villeneuve 1914). 



II. Abdomen without macrochaetae; wing usually with 



a marginal streak and gray markings. Brazil 

 Hemilucilia B. B. 



*Plinlhomyia Rdi. and Hemigymnoch&ta Corti are related to Ochromyia, though too briefly 

 described to place in the key. 



