312 
Hominoxious A r thro pods 
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 R4+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. 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 R4+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 
