328 THE BLOWFLIES OF NoRtTH AMERICA 
a few of which are pale before the metacephalic suture; frontale 
0.5 frontal width; front at narrowest 0.18 of head width, 0.23 
at vertex and 0.30 at lunule, black, heavily silvery to brownish 
pollinose, and with some seattered hair outside the frontal row 
which extend anteriorly to about the middle of the parafaciale; 
frontal row consisting of about eight bristles; vertex with 
abundant fine black hair, subpollinose, brown and silvery; 
clypeus yellowish to reddish brown; parafaciale 2.2 in width 
opposite lunule, black on dorsal half, orange to reddish brown 
below, and with scattered black hair in the middle above; faciale 
orange to brown; vibrissae set 3.4 apart; palpus orange, 5.0 in 
length; antennal segments orange brown to brown, second seg- 
ment usually orange apically, third segment 4.5 times as long 
as second; back of head black, silvery, with four or five rows of 
postocular cilia and with sparse tawny hair on the metacephalon. 
Thorax blue black, moderately covered with silvery pollen and 
with darker longitudinal stripes, one between the acrostichal 
rows of bristles and one lateral to each dorsocentral row of 
bristles; pleura lightly silvery; preparapteron light brown; 
other sclerites at wing-base black; spiracles with brown hair; 
postacrostichal bristles two. 
Legs black, rarely tinged with brown; middle tibia with one 
median ventral bristle. 
Wing hyaline, brown basally; basicosta black; subcostal sclerite 
orange, with yellowish pubescence; upper squamal lobe white 
basally, orange brown on disk, margin brown; lower squamal lobe 
white, brown on disk, margin white; costal sections 2 to 6 in 
the proportion 100 :67 :144:43 :10. 
Abdomen blue green, deep olivaceous green, or nearly blue 
black; sternites as in Cynomya mortuorum, fifth sternite (pl. 
29, C) as figured. 
Genital segments black, shining; second segment about 1.5 
times as long as second. Internal anatomical features (pl. 29, 
E and F) as illustrated. 
Female. Head width 16.0; length at antenna 8.0 and at 
vibrissa 8.4; eye height 7.7; head height 12.0; bueca 0.50 of 
eye height; frontale 0.70 of frontal width; front at narrowest (at 
vertex) 0.38 of head width, 0.42 at lunule; parafaciale 2.5 in 
width opposite lunule; vibrissae set 3.8 apart; palpus slightly 
longer than in male; third antennal segment 5.0 times as long 
as second. Legs with two median ventral bristles on middle 
tibia. Wing with costal sections 2 to 6 in the proportion 110:70: 
160:60:12. Abdomen (pl. 29, D) rather pointed apically; discal 
