P80R0PH0RA INFINE 595 



Description of Female, Male, and Lakva of Psorophoba infine: 



Female. — Proboscis rather slender, cylindrical, nniform, labellae conically 

 tapered ; vestiture of small black scales, a small ring of white ones at distal third, 

 its edges ill defined, tip of labellae gray; setae small, black, curved, those on 

 labellae more prominently outstanding. Palpi short, stout, about one-fourth as 

 long as proboscis, black scaled, the tips white ; setae rather long, black. Antennas 

 slender, the joints subequal, rugose, pilose, black; second joint a little longer 

 than the others, pale at its base ; tori subspherical, with a cup-shaped apical ex- 

 cavation, brown, a patch of silvery scales on inner side ; hairs of whorls rather 

 short, sparse, black. Clypeus elliptical, convex, blackish, nude. Eyes black. 

 Occiput narrow, convex, dark brown, clothed witii narrow, curved silvery scales 

 which about half cover the surface and are denser along median line, laterally 

 and along ocular margins, many narrow, erect, forked black ones, at the sides 

 a patch of broad, flat black scales, on the cheeks broad, flat silvery scales ; eyes 

 bordered by a row of curved black bristles. 



Prothoracic lobes moderate, elliptical, remote dorsally, clothed with narrow, 

 curved white scales and black bristles. Mesonotiim deep brown, darker in a 

 pair of submedian stripes and in a spot on lateral areas, a row of black bristles 

 on the dark stripes intensifies their color; vestiture of rather sparse, minute, 

 curved golden-brown scales, a patch of narrow silvery-white ones at anterior 

 angles and a pair of distinct small rounded spots medianly behind lateral de- 

 pressions, a few silvery scales scattered over the disk, a small patch in front of 

 ante-scutellar bare space and one on each side of this next the scuteUum, a 

 silvery spot before roots of wings; bristles black, numerous at roots of wings. 

 Scutellum trilobate, sordid gray, each lobe with a large patch of narrow, curved 

 silvery-white scales and about eight black bristles. Postnotum elliptical, promi- 

 nent, brown with a slight whitish pruinosity, nude. Pleurae and coxae brown, 

 clothed with narrow elliptical, flat white scales and brownish bristles. 



Abdomen subcylindrical, flattened, tapering posteriorly, the cerci prominently 

 exserted; vestiture of black scales with brownish luster; apices of segments nar- 

 rowly margined with flat silvery-white scales, very narrowly interrupted 

 mesially on the second segment, more broadly so on each successive segment, the 

 last wholly black; first segment with a median patch of black scales and with 

 many brown setae ; sides with an irregular row of sordid white scales forming an 

 ill-defined line ; venter clothed with whitish-golden scales, except at tip of last 

 segment, which is dark brown ; setae short, black dorsally, golden ventrally. 



Wings rather broad, hyaline, iridescent; petiole of second marginal cell 

 much shorter than its cell, that of second posterior cell also shorter than its 

 cell ; basal cross-vein rather less than its own length distant from anterior cross- 

 vein; veins brown; scales brownish black throughout, the outstanding ones on 

 apical half of wing narrowly lanceolate. Halteres entirely pale. 



Legs moderately long and slender; femora clothed with pale-yellow scales 

 below towards base, the upper side and tips black, extreme base and apex yel- 

 lowish white, a narrow white ring before apical fourth, a row of white spots 

 on inner side of front and median pairs ; tibiae black, with about nine little white 

 spots along sides; tarsi black, each joint with a narrow pure white basal ring, 

 almost obsolete on fore and middle tarsi and with the last two joints entirely 

 black; broader on the hind tarsi, the last joint with the basal half white. Claw 

 formula, 0.0-0.0-0.0. 



Length : Body about 4.5 mm.; wing 3.5 mm. 



Male. — Proboscis straight, rather long and slender, slightly thickened towards 

 apex, dark scaled, with a distinct white ring beyond middle. Palpi exceeding 

 the proboscis by nearly the length of the last two joints, which are long, 

 cylindrical, hardly enlarged ; vestiture black, a narrow white ring at bases of 



