SUBFAMILY MESEMBRINELLINAE 67 
sternopleuron with an additional bristle set on the posterior 
margin of the sclerite and ventrad of hindmost sternopleural 
bristle (this bristle has not hitherto been noted and may be 
termed the ‘‘ poststernopleural bristle’’) ; mesospiracular bristles 
two, these set farther posterior than normal; postacrostichal 
bristles two; thoracic spiracles with orange hair, the meta- 
thoracic spiracle without black hair ventrally; sclerites at wing 
base orange; smaller ampulla brown; scutellum with one lateral 
bristle, the under surface with fine orange hair; postscutellar 
plates orange pilose. 
Legs with coxae, trochanters and femora orange, tibiae and 
tarsi dark orange brown, darker apically; middle tibia with an 
elongate anterodorsal bristle near middle, two posterior bristles, 
one near the basal third and one near apical third, and one 
posterodorsal bristle near middle; hind tibia with two antero- 
dorsal bristles, one near basal third and the other near middle, 
one anteroventral bristle near the apical third, and two postero- 
dorsal bristles, one near basal fourth, the other much longer, near 
the apical third. 
Wing hyaline, brownish; basicosta and subcostal sclerite 
orange, the latter orange pubescent; costal sections 2 to 6 in the 
proportions 100:85:128:85:6; third vein with one to three basal 
setulae; squamal lobes brownish. 
Abdomen with first and second segments yellow to orange, 
the hind margin of the former narrowly metallic purplish, the 
posterior fifth of latter deep purple, the band considerably wider 
laterally, both segments with a single lateral bristle; third seg- 
ment slightly orange laterally and basally, posteriorly metallic 
purple, and with long erect marginal bristles; fourth segment 
entirely dark metallic purple, with long erect discal bristles in a 
row at middle of segment, and with a weaker row of marginal 
bristles; ventrally, mostly yellowish or orange with orange pile; 
all sternites orange to orange brown with orange pile; fifth 
sternite as illustrated (pl. 10, C). 
Genital segments dark orange brown to blackish brown, with 
fine erect black hairs. Internal anatomical features and posterior 
view of forceps (pl. 10, B and D), as illustrated. 
Female. Head height 12.0; eye height 10.0; bueca 0.08 of 
eye height; length of head at antenna 7.0, and at vibrissa 6.0, 
width 15.0; width of front at narrowest (at vertex) 0.17 of head 
width, the margins narrowly diverging anteriorly to within 1.5 
of the lunule, then suddenly diverging to 0.27 of head width at 
lunule; frontal row of bristles extending posteriorly only about 
half the distance from the lunule to the foremost ocellus, weaker 
