CTJLEX DYAEI 459 



Desceiption of Femaie, Mai^, and Labva of Culex dyabi. 



Female. — Proboscis long, uniforin, labellse conically tapered ; vestiture black, 

 with a bronzy luster, labellae brownish; sets small, curved, black, those on 

 labellse more prominently outstanding. Palpi short, one-fifth as long as pro- 

 boscis, clothed with blackish scales, the tips yellowish scaled, with many short, 

 stiff setae. Antennae long, the joiats subequal, rugose, pilose, black, second 

 joint slightly enlarged; hairs of whorls rather short, sparse; tori subspherieal, 

 with a cup-shaped apical excavation, yellowish, brown on ianer side. Clypeus 

 rounded triangular, blackish, nude. Occiput dark brovm, rather sparsely 

 clothed with coarse, narrow, curved, pale-yellow scales, denser towards the sides, 

 margins of eyes and the cheeks white scaled, scales on lower part of sides fiat; 

 many very slender, erect, forked black scales, most numerous on the nape and 

 sublaterally; setae along margins of eyes rather short, curved, black. 



Prothoracic lobes elliptical, remote dorsally, with narrow white scales and 

 many black setae. Mesonotum dark brown, reddish brown in two approximated 

 longitudinal bare convex stripes and two others posteriorly at sides of ante- 

 scutellar space; vestiture of short hair-like bronzy-brown scales in two broad 

 stripes at outer sides of bare submedian stripes and on posterior half of disk, 

 coarser pale yellowish ones ia a median stripe ; on sides of disk anteriorly, about 

 lateral depression, about the ante-scuteUar space, and along the posterior bare 

 stripes. Scutellum trilobate, brown, clothed with narrow, curved, shining pale- 

 yellow scales, each lobe with a large group of brown bristles. Postnotum 

 elliptical, prominent, brown, pruinose, nude. Pleurae and coxse luteous, with 

 darker spots and patches of lanceolate whitish scales and rows of pale bristles. 



Abdomen subcylindrical, depressed, truncate at tip; dorsal vestiture of 

 blackish-brown shining scales, bases of segments with pale-yeUowish narrow 

 bands ; first segment with a small patch of white scales in the middle and with 

 many pale hairs; venter sparsely clothed with pale dirty yellowish scales, and 

 numerous dark hairs. 



Wings ample, hyaline ; petiole of second marginal cell much shorter than its 

 cell, that of second posterior cell also shorter; basal cross-vein distant almost its 

 own length from anterior cross- vein ; scales brown, those on costa black, the out- 

 standing ones numerous, broadly Linear, densest apically; a slight tufting at 

 base of third vein. Halteres pale, with blackish knobs. 



Legs long and slender; vestiture blackish; femora whitish beneath to near 

 apices, broadly so at base, knees yellowish white; tibiae black, with yellowish 

 apices, a narrow ill-defined pale line ventrally on median pair; tarsi blackish 

 with bluish and bronzy reflections, the joints with minute basal yellowish-white 

 rings or spots, last joint of hind tarsi entirely black. Claw formula, 0.0-0.0-0.0. 



Length : Body about 5 mm. ; wing 5.5 mm. 



Male. — Proboscis straight, uniform. Palpi exceeding the proboscis by more 

 than the length of the last joint, slender, blunt at tips ; last two joints and end 

 of long joint thickened and bearing many long black and yellowish hairs; 

 vestiture of brownish scales, a patch of yellowish ones at bases of last two joints, 

 a narrow pale ring at basal third of long joint and a long patch dorsally at its 

 apical third. Antennse plumose ; last two joints long and slender, rugose, pilose, 

 black, the others short, slender, whitish, with thick black rings at insertions of 

 the hair-whorls; hairs long, dense, black. Coloration similar to the female. 

 Legs with a strong bronzy luster, the tarsal rings obsolete. Wings narrower 

 than in the female, the stems of the fork-cell longer, vestiture sparse. Abdomen 

 elongate, depressed ; dorsal pale bands broader than in the female ; lateral cilia- 

 tion long and abundant, brownish. Claw formula, 2.1-3.1-0.0. 

 • Length : Body about 5.5 mm.; wing 4.5 mm. 



Genitalia (plate 19, fig. 137) : Side-pieces elongate, conical, uniform, with- 

 out lobes ; clasp-filament long, uniform, slightly enlarged at base with a small 



