114 THE BLOWFLIES OF NortH AMERICA 
occiput, and with a number of medium-length whitish-yellow 
hairs which become longer below. 
Thorax dark metallic bluish green to black, with thin whitish 
pollen anteriorly, and with three faint, blackish longitudinal 
stripes on dorsum which do not extend posteriorly beyond the 
scutellar suture; pleura lightly silvery anteriorly; humerus con- 
colorous; propleuron yellow pilose; mesopleuron with scattered 
black setae on posterior four-fifths; sternopleuron with scattered 
dark hair above and tawny below; hypopleuron with brownish 
pile on posterior four-fifths; pteropleuron with thick-set pile on 
posterior three-fourths; postalar declivity anteriorly and in 
center with dark hair; preparapteron dark brown; preepaulet 
black; squamal process brown; postparapteron brown to black, 
its rim brown; greater ampulla brown, with short brown recum- 
bent pile; postalar callus concolorous; mesothoracic spiracle with 
yellowish-white hair; metathoracie spiracle dark brown, with 
several long brown hairs on anterior and ventral margins; 
halteres orange; scutellum concolorous, the under surface later- 
ally with tuft of whitish-yellow pile toward base; lateral post- 
scutellar plate with dark-brown setae. 
Legs dark brown to black; coxae thinly whitish pollinose with 
whitish hair. 
Wing (pl. 9, B) hyaline, infuscated (sometimes nearly black) 
toward base; costal sections 2 to 6 in the proportions 
80:58 :100 :30:10; subcostal sclerite orange brown; remigium 
basally below with a few fine hairs; third vein setose one-fifth 
the distance to the cross vein; fourth vein with a rounded angle 
which is first bent toward anterior margin of wing at nearly 
90 degrees, then toward wing apex, and ending 1.0 before the 
apex; upper squamal lobe hyaline on inner half, infusecated on 
outer half; lower squamal lobe infuscated. 
Abdomen usually shining dark metallic bluish green with 
purple reflections but sometimes greenish with thin whitish 
pollen in certain lights; first tergite shining black; second, third, 
and fourth tergites with shining purplish hind margins; all 
tergites below strongly whitish pollinose and with soft pale 
hair; first and second sternites with long whitish pile; third and 
fourth sternites with dark hair; fifth sternite as illustrated. 
Genital segments black, shining, with black scattered setae. 
Internal features (pl. 16, B, C, and D) as illustrated. 
Female. Head (pl. 1, D) width 16.0; length at antenna and 
at vibrissa 6.5; eye height 9.7; head height 12.8; bueea 0.45 of 
eye height; frontale 0.5 width of front, orange to orange brown; 
front at narrowest (about 1.0 above lunule) 0.25 head width, 
