PSOROPHORA S.EVA 537 



bate, middle lobe larger than the others, moderately prominent, with many 

 well-separated blackish bristles. Postnotum prominent, rounded, brownish 

 black, nude. Pleurae blackish, with patches of white scales and a few black 

 bristles ; coxae brown, each with a small patch of fiat white scales at base. 



Abdomen subcylindrical, tapering posteriorly, slightly flattened, veiy dark 

 brown; the segments with many rather short, black, lateral and apical hairs; 

 clothed dorsally with black scales with a brilliant violet-blue luster; first seg- 

 ment with a central patch of white scales and with many black setae ; sides with 

 large, apical, segmentary subquadrate patches of flat white scales, absent on the 

 last two segments ; venter violet-black scaled, like dorsum. 



Wings moderate, rather narrow, entirely smoky brownish, heaviest towards 

 costa, veins darker; petiole of second marginal cell not quite as long as its cell, 

 that of second posterior about equal to it ; basal cross- vein about its own length 

 distant from anterior cross-vein ; scales narrow, black with a bright-blue luster, 

 especially along costa, those along veins in two series, short appressed ones and 

 long, narrowly lanceolate outstanding ones. Halteres with whitish stems and 

 black knobs. 



Legs long, appearing thickened by numerous erect violet-black scales; basal 

 half of hind femora pale and clothed with flat, yellowish iridescent scales, out- 

 wardly with suberect blue-black scales; knees, broadly white scaled; tibiee and 

 tarsi clothed with dense violet-black erect scales, most prominent on hind legs. 

 Claw formula, 1.1-1.1-1.1. 



Length : Body about 8 mm. ; wing 7 mm. 



Male. Proboscis straight, nearly imiform. Palpi very long, exceeding the 

 proboscis by the last two joints, these latter together exceeding the long joint in 

 length; long joint with a false articulation before middle, slightly thickened 

 apically ; last two joints somewhat thickened apically and bearing black hairs ; 

 vestiture of violet-black scales. Antennae densely plumose; second joint long 

 and bearing many erect scales, the succeeding segments short, brown at origin 

 of hair-whorls, then blackish, then pale. Coloration similar to the female. 

 Abdomen elongate, depressed, broadened to fifth and sixth segments, with 

 brown, moderately long and abundant lateral ciliation. Wings narrower than 

 in the female; petioles of second marginal and second posterior cells longer; 

 cross-veins more closely approximated. Claw formula, 2.1-2.1-1.1. 



Length : Body about 7.5 mm. ; wing 6 mm. 



Genitalia (plate 20, fig. 145) : Side-pieces long, curved, three times as long 

 as wide, tips rounded, apex and inner margin densely hair\^, somewhat lobed. 

 Clasp-filament short, stout, constricted near base, tip obliquely tapering, a small 

 terminal claw, Harpes elliptical, concave, inner margin revolute, tip tliickened, 

 with small teeth projecting laterally. Harpagoues with a long slender stem, 

 expanded at tip and bearing a row of coarse setse and a slender filament. Unci 

 forming a basal cylinder, margins revolute, inner edges dentate. 



Larva, Stage IV (plate 114, fig. 386). Head subquadrate, wider than long, 

 posterior angles rounded; eyes on an irregular prominence; antennae inserted 

 laterally on an angled prominence, front margin shallowly emarginate. An- 

 tennae cylindrical, nearly unifonn, sparsely spined all over, but most promi- 

 nently along outer side, a single hair at outer fourth ; four articulated terminal 

 processes and a long spine. Eyes large, divided, the larger anterior part pointed. 

 Both pairs of dorsal head-hairs single; ante-antennal hairs single. Mouth- 

 brushes inserted on outer angles of head, folded downward and backward, of 

 numerous coarse setae which are finely transversely pectinate. Mental plate 

 triangular, with a central tooth and about eight on each side, the penultimate 

 one longer. Mandible quadrangular, slightly convex without, a single append- 

 age near tip ; an outer row of few coarse setae ; dentition of two large teeth with 

 35 



