SuBFAMILY MESEMBRINELLINAE 43 
13.0; bueca 0.21 of eye height, dull orange with thin whitish 
pollen and with both dark and pale hairs before the metacephalic 
suture; frontale almost twice as wide as parafrontale anteriorly 
and nearly four times as wide posteriorly, orange red; front 
with nearly parallel margins, at vertex, 0.23 of head width, 0.26 
at lunule, reddish orange in ground color, and thinly silvery- 
yellow pollinose, with a few dark hairs outside the frontal rows 
of bristles; these rows consisting each of about five bristles and 
extending posteriorly only about one-third the distance from 
the lunule to the foremost ocellus; parafaciale reddish orange, 
covered with silvery-yellowish pollen, 1.6 in width opposite 
lunule; faciale with dark, thick-set, short bristles which ascend 
nearly half the distance from the vibrissa to the antennal base; 
vibrissae only slightly above the oral margin and set 4.0 apart; 
antenna yellow to yellow orange, third segment 3.5 times as 
long as second; arista orange at base, darker apically, with 
brown ciliation which is darker toward apex; palpus orange, 4.0 
in length; back of head dark brown, postorbits with thin silvery 
pollen, one row of postocular cilia and with scattered yellow hair. 
Thorax yellowish to brownish, darker on dorsum, with thin 
whitish pollen which, when viewed from behind, extends in 
three dorsal longitudinal stripes; preacrostichal bristles two, 
the hindmost set 2.5 before the suture; hindmost predorsocentral 
bristle 2.0 before the suture; dorsum, dorsal margin of sterno- 
pleuron, and posterior margin of mesopleuron with fine black 
hair, but elsewhere with fine orange hair; postacrostichal bristles 
in prescutellars only; sternopleural bristles three; sclerites at 
wing base yellow to orange; spiracles with yellow hair, the meta- 
thoracic spiracle with several long black hairs on the posterior 
margin; tympanic ridge wide and strongly setose, the setae 
black; secutellum concolorous with dorsum, under surface later- 
ally with pale hair, with black hair in center, lateral bristles two, 
with a weaker bristle just anterior to basal; postscutellar plates 
with long pale hair. 
Legs varying from yellow basally to brown apically; coxae 
with soft yellow pile; middle tibia with anterodorsal bristle near 
middle and ventral bristle near apical third. 
Wing (pl. 8, C) hyaline, clouded with brown, and strongly 
yellowish brown along the costal border; subcostal sclerite and 
basicosta orange, the former with soft, fine, orange pubescence; 
costal sections 2 to 6 in the proportions 110:84:140:50 :20; anter- 
ior cross vein very short; squamal lobes brown, with a nap of 
very short fine pile above. 
Abdomen colored like thorax, shining, the posterior margin of 
