304 THE BLOWFLIES oF NortH AMERICA 
row consisting of from 10 to 12 bristles which are weak and 
hairlike posteriorly at the narrowest portion of the frontale, 
the rows extending anteriorly to the lunule; clypeus reddish 
orange to brownish black, with thin grayish pollen; parafaciale 
1.9 in width opposite lunule, black, often reddish on lower third, 
with bronze colored pollen; epistoma nearly in eclypeal plane; 
vibrissae set 2.9 apart; antennal bases not separated, the carina 
inconspicuous, third segment 4.0 in length, and reaching four- 
fifths the distance toward the vibrissa; arista dark brown to 
black, with long black cilia above and below for. two-thirds its 
length; back of head slightly concave above occiput, the meta- 
cephalon rounded in profile, black, with three or four rows of 
postocular cilia and with tawny to yellow orange hair around 
the occiput and below, which sometimes covers the metacephalon 
and occurs sparsely on the bucea. 
Thorax black with but thin grayish pollen; humeral bristles 
three, strong, in nearly a straight row, and usually with a weaker 
fourth humeral bristle slightly anterior to these; preintraalar 
bristles three, the foremost weak, the hindmost 0.8 before the 
suture; preacrostichal bristles only two strong, the hindmost 
2.4 before the suture; predorsocentral bristles three, the fore- 
most weak, the hindmost 2.0 before the suture; prosternum, 
postalar declivity and squamal pit with black setae; postalar 
bristles two, and a weak third median to hindmost; sclerites at 
wingbase black, greater and lesser ampulla and preparapteron 
with white decumbent pile; postintraalar bristles two; postsup- 
raalar bristles four, the bristle between the first and third weak 
and sometimes absent; mesothoracic spiracle tawny brown; meta- 
thoracic spiracle dark brown; scutellum with dark hair on 
lateral margins of under surface. 
Legs like those of vomitoria, but hind tibia with three or four 
anteroventral bristles. 
Wing hyaline, often slightly brownish toward costal margin 
and base; costal sections 2 to 6 in the proportion 100:65 :135:- 
45:12; basicosta black; subcostal sclerite orange, with orange 
pubescence; fourth vein terminating in costa 1.0 before wing 
apex; upper squamal lobe brownish, the rim nearly black; lower 
squamal lobe dark brown, the rim whitish. 
Abdomen metallic blue with thin whitish pollen apparent only 
in certain lights; first segment nearly black; intermediate seg- 
ments with strong lateral bristles, the second segment with a 
marginal row of bristles, the lateral ones strong, those toward 
center of dorsum very weak; fourth segment with considerable 
erect black hair. 
