CULEX PIPIENS 365 



Description of Female, Male, Larva, Pupa, and Egg of Culex pipiens: 



Female. Proboscis moderate, uniform, labellfE conically tapered, vestiture 

 brown, pale beneath, darker towards tip ; setae minute, curved, black, those on 

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

 proboscis, uniform, clothed with blacldsh scales, setae at base long and outstand- 

 ing. Antenna moderate, joints subequal, rugose, pilose, blackish, second joint 

 scarcely enlarged; tori subspherical with cup-shaped apical excavation, yellow- 

 ish shading to dark brown on inner side, Clypeus rounded triangular, convex, 

 brownish black, nude, slightly pruinose. Ej^es black. Occiput brown, clothed 

 with narrow, light brown, curved scales, with some broad, flat white ones at lower 

 parts of sides and along margin of eyes, numerous erect, forked scales on vertex, 

 yellowish white or pale brown according to the light. 



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

 pale scales and brown bristles. Mesonotum brown with two narrow, impressed, 

 dorsal bare lines in front, clothed with narrow, curved golden-broAvnish scales 

 and numerous brown bristles. Scute! lum trilobate, luteous, clothed with nar- 

 row, curved pale-golden scales, each lobe with a tuft of golden-brown bristles. 

 Postnotum elliptical, pale brown, nude. Pleuree and coxae brownish luteous, 

 clothed with patches of flat yellowish-white scales and rows of brown bristles. 



Abdomen subcylindrical, truncate at tip, clothed with blackish scales dorsally, 

 which have a slight bronzy and bluish reflection, each segment except the first 

 with a basal transverse band of yellowish-white scales, uniform, rather broad, 

 second segment with band produced in middle, widening at the sides to form a 

 row of basal segmentary, triangular, lateral white spots ; last segment black, 

 white scaled at sides; venter clothed with yellowish- white scales; membrane 

 beneath dark ; hairs at ends of segments long, yellowish. 



Wings moderate, hyaline; petiole of second marginal cell about one-fifth or 

 one-sixth as long as its cell, that of second posterior cell shorter than its cell; 

 basal cross-vein distant rather more than its own length from anterior cross- 

 vein; outstanding scales of vein dark brown, 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 tibise whitish ; 

 tibiae and tarsi entirely black scaled \vith brassy luster beneath. Claw formula, 

 0.0-0.0-0.0. 



Length : Body about 3.5 mm. ; wing 4 mm. 



Male. Proboscis long and straight, gradually enlarged towards apex. Palpi 

 exceeding proboscis by more than the length of the last joint, slender, apical 

 portion slightly enlarged; vestiture black with bronzy luster, a narrow pale ring 

 at basal third of long joint ; 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 insertions of hair- 

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

 female. Abdomen elongate, depressed, dorsally with a slight metallic reflection, 

 basal bands broad, broadened at sides on sixth and seventh segments; eighth 

 segment nearly entirely white scaled ; lateral ciliation blackish, abundant. Wings 

 narrower than in the female, the stems of the fork-cells longer, vestiture 

 sparser. Claw formula, 1.1-1.1-0.0. 



Length : Body about 4 mm. ; wing 3.5 mm. 



Genitalia (plate 17, fig. 123; plate 19, figs. 138 and 139) : Side-pieces over 

 twice as long as wide, tips rounded with a low rounded subapical prominence 

 bearing a spine, four rods with bent tips, a leaf-like appendage and a seta ; clasp- 

 filament moderate, stout with a terminal articulated spine. Harpes divided, 

 inner branch bearing a large tuft of spines at tip, outer short and curved; 

 harpagones divided, branches subequal. Unci obscured. 



