80 THE BLOWFLIES OF NorTtH AMERICA 
sory ocellar bristles located rather far behind the posterior ocelli; 
faciale sharply defined, with black setae ascending nearly one- 
third the distance to the antennal base; parafaciale orange, with 
golden pollen, 1.4 in width opposite lunule and slightly narrower 
below; vibrissae set 3.8 apart; antenna bright orange, third 
segment 3.5 times as long as second, and rather wide throughout; 
palpus orange, 4.0 in length; back of head black, silvery pol- 
linose, with one row of postocular cilia and with abundant 
yellow hair; metacephalon orange with silvery pollen. 
Thorax blue black, the pleura. rather brownish, with thin 
whitish pollen, and with three longitudinal stripes on dorsum; 
humerus with three bristles, laterally with fine yellowish hair; 
preacrostichal bristles two, the hindmost set 2.2 before the 
suture; hindmost predorsocentral bristle set 1.5 before the 
suture, preintraalar bristle one; postacrostichal bristles two; fine 
hair on thorax black except anteriorly on sternopleuron and 
posteriorly on pteropleuron; sternopleural bristles two; mesospir- 
acular bristles three or four arranged nearly in a row; pros- 
ternum with black setae except posteriorly where the hair is 
pale; sclerites at wing base dark brown to black, the greater 
ampulla with fine silvery pubescence; postalar declivity with 
black hair in center; tympanic ridge nearly bare; spiracles with 
brown hair, metathoracic spiracle with long black hair on ventral 
margin; scutellum with fine dark orange to brown hair on under 
surface, lateral bristles two, a third weaker lateral bristle just 
anterior to basal bristle; postseutellar plates with dark brown 
setae. 
Legs brown, the color graduating to brownish black apically; 
coxae with pale hair; chaetotaxy as in bicolor. 
Wing (pl. 8, F) hyaline, rather brownish anteriorly and 
basally, and infuseated at anterior cross vein; basicosta and sub- 
costal sclerite dark brown, the former with silvery pubescence, 
the latter with dark brown pubescence; costal sections 2 to 6 
in the proportions 90:60:105:80:12; squamal lobes rather milky 
white basally, rims dark brown with dark brown ciliation. 
Abdomen metallic purple over dark brown ground, with faint 
silvery pollen and rather erect dense short black hair, and each 
segment with a marginal row of bristles; sternites progressively 
wider and shorter toward fifth which is very short and wide 
(Cplal2e Db): 
Genital segments large, black, shining, with abundant black 
hair; inner forceps with inner margins not divergent, their 
bases posteriorly united and swollen into a hump, this divided 
into two arms extending posteriorly toward anus and bearing 
