312 Hominoxious Arthropods 



kk. Hypopygium of the male without style. A. stelviana 



B. B Acrophaga B. B. 



hh. Arista usually plumose 'nearly to the tip; posterior dorso- 

 centrals and inner dorsocentrals (acrostichals) well 

 developed; dorsal surface of the squamula thoracalis 

 hairy; abdomen metallic and usually pollinose; genae 

 hairy. 



i. With one pair of ocellar macrochaetae. C. vomitoria, 

 erythrocephala, viridescens, and related species. Both 



hemispheres Calliphora R. D. 



ii. With two strong pairs of ocellar macrochaetae . . E. latifrons. 



Pacific slope of the U. S Eucalliphora Town. 



ff. First section of RI+S 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. Genae bare; posterior inner and outer dorsocentrals distinct 



and well developed. L. ccesar, sericata, sylvarum, and 



related species. Widely distributed in both hemispheres 



(fig. 103) Lucilia R. D. 



gg. Genae with microchaetae, at least down to the level of the base 



of the arista, 

 h. Mesonotum flattened behind the transverse suture. 



i. Posterior dorsocentrals inconstant and unequally developed; 

 one pair of posterior inner dorsocentrals. P. terraenova. 



North America Protophormia Town. 



ii. Posterior dorsocentrals well developed, the inner dorso- 

 centrals (acrostichals) unequally developed. P. azurea, 



chrysorrhcea, 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 Rj+5 at most 



only bristly at the base, bend near apex rectangular, RI ends over 



the crossvein; fronto-orbital macrochaeta 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; genae 

 with several ranges of microchaetae; vibrissal ridges strongly 

 convergent; abdomen with well developed macrochaetae; 

 costal spine usually absent; eyes of the male widely separated, 

 h. Peristome broad, pteropleural macrochaetae distinct; one or 

 two sternopleurals ; in the female a single orbital macro- 

 chaeta; last abdominal segment without discal macro- 

 chaetae; hypopygial processes of the male with a long 

 stylet; second abdominal segment of the female sometimes 



