SUBFAMILY MESEMBRINELLINAE 87 
six bristles; vertex subpollinose, black; clypeus golden over red- 
dish ground color; parafaciale 1.5 in width opposite lunule, 
orange, yellowish silvery pollinose; vibrissae 0.6 above oral 
margin and set 3.3 apart; palpus orange, 4.5 in length; anten- 
na orange, third segment two and one- half times as long as 
second and reaching four-fifths the distance to the vibrissae; 
arista brown, ciliation brown; back of head silvery over black 
ground color, the postorbits orange pollinose, with one row of 
postocular cilia and with yellowish hair. 
Thorax black with thin whitish pollen anteriorly and on 
pleura, with indistinct shining longitudinal stripes on dorsum 
which do not extend to suture; pleura lightly silvery; humerus 
concolorous, and with three bristles, all strong; propleural 
bristles two or three; preacrostichal bristles two, the hindmost 
placed 2.6 before the suture; hindmost predorsocentral bristle 
placed 1.6- before the suture; sternopleuron black setose; ster- 
nopleural bristles three; mesopleuron on posterior four-fifths, 
hypopleuron on posterior fourth, pteropleuron on _ posterior 
half and prosternum entirely, with black setae; sclerites at 
wing base black; postacrostichal bristles two; mesopiracular 
bristles three or four, almost in a tuft; thoracic spiracles with 
dark-brown hair; scutellum concolorous with dorsum, the under 
surface generally with yellowish-brown hair, lateral bristles two, 
the basal one strong. 
Legs brown to black; coxae without fine pale hair; nndute 
femur with one eaterion bristle near middle, about Pont antero- 
ventral bristles basally and four to six ventral bristles basally; 
middle tibia with one posterior bristle near basal fourth and 
usually one posterodorsal bristle near apical third (one speci- 
men has one bristle near basal fourth on this surface on one 
side); hind tibia with two elongate anterodorsal bristles, one 
near basal third and one near middle; claws and pulvilli a little 
shorter than last tarsal segment. 
Wing (pl.8, J) hyaline, brown basally; costal sections 2 to 6 
in the proportions 95:75 :135:86:18; third vein with two or three 
basal setulaé; subcostal sclerite and basicosta dark brown; fourth 
vein entering costa 1.0 before wing apex; both squamal lobes 
brown especially on posterior margins, the lower lobe with a 
fringe of dark brown hair. 
Abdomen black with purplish reflections and silvery pollinose 
in certain lights especially ventrally; third segment with a mar- 
ginal row of strong bristles; fourth segment with strong erect 
discal bristles in a partial row, and with a marginal row of weak- 
er bristles. 
