108 THE BLOWFLIES OF NortH AMERICA 
Male. Head width 17.5; length at antenna and vibrissa 7.2; 
length at oral margin 7.5; eye height 12.6; head height 15.5; 
bucea 0.21 eye height, thinly golden pollinose, with abundant 
medium length golden hair, the anterodorsal margin with an 
area of dark hair; frontale orange to orange brown, smooth; 
front at vertex 0.10 of head width, 0.28 at lunule, silvery yellow 
pollinose, with a few dark hairs in a single row extending to 
the foremost frontal bristle; frontal bristles about 11; vertex 
brownish black, subpollinose; clypeus yellowish golden; para- . 
faciale 1.0 in width opposite lunule, golden pollinose; faciale 
with minute yellowish setae; vibrissae separated by 2.6; palpus 
yellow orange, 3.2 in length; antenna yellow orange, third seg- 
ment five times as long as second and reaching 0.85 the distance 
to the vibrissa; back of head brownish above, orange below, with 
sparse yellowish hair, below with longer orange hair. 
Thorax metallic yellow green to bluish black with darker 
dorsal longitudinal stripes, little or no pollinosity except imme- 
diately behind head on dorsum which is thinly whitish in certain 
lights; pleura mostly orange, shining or but slightly silvery; 
humerus yellow orange; propleuron whitish pollinose; meso- 
pleuron with yellow pile except on anterior fifth; sternopleuron 
with scattered long yellow hair except anteriorly; hypopleuron 
with yellow hairs; pteropleuron and prosternum with scattered 
yellow hair, the former only on posterior half; postalar declivity 
with tuft of long yellow hair in center; sclerites at wing base 
yellow orange; tympanic pit yellow pilose on outer rim; greater 
ampulla yellow with fine yellowish white pile; lesser ampulla 
black; postalar callus orange brown to black; mesothoracic 
spiracles with orange hair; halteres yellow orange; scutellum 
concolorous with dorsum, the under surface laterally with fine 
yellowish pile; lateral postscutellar plates with pale yellow 
pilosity. , 
Wing (pl. 9, A) hyaline with infuseated pattern as illustrated; 
costal sections 2 to 6 in the proportion 92.5 :57 :120:45:10; sub- 
costal sclerite orange; remigium below basally with fine pale 
hair; third vein setulose 0.35 the distance to the cross vein; upper 
squamal lobe tinged with pale brown; lower squamal lobe yellow 
brown to orange. 
Abdomen metallic green to bluish with thin silvery pollen, 
first segment yellow orange basally, greenish blue on posterior 
margin; second, third, and fourth segments greenish blue; 
with yellow hair on light portions and below on sternites, else- 
where with black hair. 
Genital segments with scattered black hair, the first segment 
