970 Tse BLOWFLIES or NortuH AMERICA 
tenna dark brown to black, second segment orange to orange 
brown, lighter at apex, third segment orange at base, orange 
brown to brown apically, usually lighter below, and 3.2 times as 
long as second; arista brown, cilia brown and long; back of head 
black, with silvery pollen about occiput and: on metacephalon, 
with two or three rows of postocular cilia and with some pale 
hairs particularly on metacephalon. 
Thorax blue green with bronze and purplish luster, rather 
shining but slightly whitish or silvery anteriorly and on pleura 
in certain lights, with darker purplish or blackish longitudinal 
stripe outside acrostichal row which extends over the prothorax 
to just posterior of suture; humeral bristles three; hindmost pre- 
acrostichal bristle and predorsocentral bristles placed 2.2 and 
1.4, respectively, before suture; intrapostalar bristle rather more 
apparent than in servcata. 
Legs black, femora and tibiae often dark brown; middle femur 
with one (rarely with two) anterior bristle near middle; middle 
tibia with one posterodorsal bristle near apical third; hind tibia 
with an anterodorsal row of bristles about six of which are long, 
and usually with three posterodorsal bristles, if only two, then 
one near basal fourth and one near apical third, the one near 
basal third missing. 
Wing hyaline, brownish anteriorly, especially so toward base; 
basicosta yellowish to orange; subcostal seclerite orange to orange 
brown, darker apically, with short fine decumbent orange pile; 
costal sections 2 to 6 in the proportions 65: 44:94:89: 8; third 
vein setulose fully two-thirds the distance to the anterior cross 
vein; second and third sections of fourth vein in proportion 7 :6; 
upper squamal lobe hyaline and white basally, orange to brown 
apically; lower squamal lobe whitish basally, orange brown’ 
apically. 
Abdomen colored like thorax, with faint whitish pollen espe- 
cially on venter, this pruinescence not apparent except in certain 
lights; first segment black, only faintly metallic; second segment 
without dorsal anterior markings and with marginal bristles, the 
middle pair or two of which are longer and more erect than the 
lateral bristles (not to be considered as median marginal bris- 
tles) ; third segment with long marginal bristles; fourth segment 
with scattered erect bristles. 
Genital segments larger than in sericata, black, mostly shining, 
only slightly greenish, and with scattered erect black hair. In- 
ternal anatomical features (pl. 25, H, I, and J) as illustrated. 
Female. Head width 11.0; length at antenna 6.0 and at vi- 
brissa 5.7; eye height 7.2; total head height 10.0; epistoma wider 
