CULEX QUINQUEFASCIATUS 353 



Descbiption of Female, Male, and Larva of Culex quinqxjefasciatus : 



Female. Proboscis moderate, uniform, labellae conically tapered; vestiture 

 black, with a whitish shade beneath ; setae minute, curved, black, those on labellge 

 more prominently outstanding. Palpi short, about one-fifth the length of pro- 

 boscis, uniform, clothed with blackish scales, setae at base long, outstanding. An- 

 tennae moderate, joints subequal, rugose, pilose, blackish, second joint scarcely 

 enlarged ; tori subspherical with a cup-shaped apical excavation, yellowish shad- 

 ing to dark brown on inner side. Clypeus rounded triangular, convex, brownish 

 black, nude, slightly pruinose. Eyes black. Occiput brown, clothed with narrow, 

 curved scales, pale brownish on vertex, yellowish white on sides and along 

 margins of eyes, numerous erect, forked scales, yellowish white on vertex, black 

 on sides. 



Prothoracic lobes elliptical, remote dorsally, brown, clothed with a few narrow 

 pale scales and brown bristles. Mesonotum dark brown, with two narrow, im- 

 pressed, dorsal bare lines, clothed with narrow, curved pale-bronzy scales with a 

 brassy luster and numerous brown bristles. Scutellum trilobate, luteous, clothed 

 with narrow pale scales, each lobe with a tuft of brown bristles. Postnotum 

 elliptical, brown, nude. Pleurae and coxae pale luteous, clothed with patches of 

 flat white scales and rows of brown bristles. ' 



Abdomen subcylindrical, depressed, truncate at tip, clothed with blackish 

 scales dorsally, which have a slight bluish reflection; flrst segment with a patch 

 of whitish scales in the middle and with many pale hairs ; each of the succeeding 

 segments with a basal transverse band of yellowish- white scales, each band 

 widest in middle, those on first four segments distinctly triangular and separated 

 from lateral spots; a row of lateral basal segmentary triangular white spots; 

 seventh segment white scaled along sides, last entirely yellowish-white scaled; 

 venter clothed with yellowish-white scales, membrane beneath dark; ends of 

 segments with yellowish, rather long hairs, abundant at tip. 



Wings moderate, hyaline ; petiole of second marginal cell about one-fourth as 

 long as its cell, that of second posterior cell about as long as its cell ; basal cross- 

 vein distant rather more than its own length from anterior cross-vein ; scales of 

 veins dark brown with a blue luster on costa, rather broadly linear. Halteres 

 whitish with brown knobs. 



Legs moderate, uniform ; femora clothed above with black scales with a bluish 

 and bronzy luster, beneath broadly white to tips; knees and tips of hind tibiae 

 whitish; tibiae and tarsi black scaled vnth pale-brassy luster beneath. Claw 

 formula, 0.0-0.0-0.0. 



Length : Body about 4 mm. ; wing 4.5 mm. 



Male. Proboscis straight, gradually enlarged towards apex, with an indis- 

 tinct broad pale ring beyond middle, underside pale scaled throughout. Palpi 

 exceeding proboscis by the length of the last joint, slender, uniform, the apical 

 portions slightly enlarged ; vestiture black with pale scales intermixed on long 

 joint, a white ring at basal third of long joint, a patch of white scales at bases of 

 last two joints beneath, abundant long black hairs at end of long joint and on 

 last two. Antennae plumose; last two joints long and slender, rugose, pilose, 

 black, the others short, whitish, with black enlarged rings at insertion of hair- 

 whorls ; hairs long, black ; tori entirely brown. Coloration similar to the female. 

 Abdomen elongate, depressed, dorsally with a stronger metallic reflection, basal 

 bands broadened at sides, not triangular, reaching margin, those on sixth and 

 seventh segments expanded laterally, last segment entirely pale scaled, lateral 

 ciliation pale, abundant. Wings narrower than in the female, the stems of the 

 fork-cells longer, vestiture sparser. Front tarsi with the last joint curved and 

 with a projection at base. Claw formula, 1.1-1.1-0.0. 



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

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