436 MOSQUITOES OF NORTH AMERICA 



Desceiption of Female, Male, and Labva of Culex daumastocampa: 



Female. Proboscis long and slender, swollen towards tip, labellaj conically 

 tapered; vestiture black; setae minute, curved, black, those on labella^ more 

 prominently outstanding. Palpi short, black, about one-sixth as long as pro- 

 boscis, with some outstanding setae at base. Antennse moderate ; joints subequal, 

 rugose, pilose, black, second joint slightly enlarged; tori subspherical, with a 

 cup-shaped apical excavation, ochraceous; hairs of whorls sparse, long, black. 

 Clypeus conical, convex, brown, nude. Eyes black. Occiput brown, clothed with 

 narrow, curved scales on the vertex, fiat ones on the sides, golden on the vertex 

 with black scales sparsely interspersed, a large patch of broad, flat, black scales 

 on each side, ocular margin and cheeks white scaled; many erect, forked pale 

 yellowish scales dorsally. 



Prothoracic lobes elliptical, remote dorsally, rather prominent, clothed with 

 pale hairs. Mesonotum yellow brown, with two rather broad impressed bare 

 lines and a narrow median one, vestiture of coarse, narrow, curved scales, 

 blackish brown on the disk, broadly golden in front and over anterior angles 

 and continued along the sides about halfway to base of wing ; bristles black and 

 coarse. Scutellum trilobate, luteous, clothed with narrow, curved blackish- 

 brown scales, each lobe with a group of black bristles. Postnotuni elliptical, 

 prominent, pale ochraceous, nude, a median, somewhat darker longitudinal 

 ridge. Pleurae pale greenish yellow, with a transverse brownish band, coxte pale 

 yellowish, with rows of short pale bristles. 



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

 black scales with a bronzy luster; ventral vestiture paler, without distinct 

 banding. 



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

 as long as its cell ; that of second jDosterior cell shorter than its cell ; basal cross- 

 vein about its own length distant from anterior cross-vein ; scales of veins brown, 

 those on the costa darker, outstanding ones narrowly ligulate. Halteres pale. 



Legs long and slender ; femora bronzy brown, the hind pair pale with a brassy 

 luster, dark at tips, the knees white scaled ; tibise and tarsi black with a bronzy 

 luster, hind tibiae with the scales roughened and the apices broadly white, hind 

 tarsi with the first, second, and third joints with a narrow basal white ring, 

 fourth and fifth joints and all of fore and mid tarsi without white rings. Claw 

 formula, 0.0-0.0-0.0. 



Length : Body about 2 mm. ; wing 2.3 mm. 



Male. Palpi nearly as long as proboscis, slender, uniform, apices blunt, with 

 some long setae; vestiture black. Antennae plumose; last two joints long and 

 slender, rugose, pilose, black, the others short, stout, whitish, with black rings 

 at insertions of hair- whorls ; hairs long, brown, rather dense. Coloration similar 

 to the female. Wings scarcely narrower than in the female, the stems of the 

 fork-cells about the same, basal cross-vein far removed from anterior cross-vein, 

 vestiture about as in the female. Abdomen with the hairs rather coarse, 

 irregularly placed, pale. Claw formula 1.0-1.0-0.0. 



Length : Body about 2 mm. ; wing 2 mm. 



Genitalia (plate 9, fig. 63) : Side-pieces over twice as long as wide, tips con- 

 ically tapered ; inner lobe double, outer part low, quadrate, bearing five sets, 

 inner part well removed, a pointed rod on a pedicle and three smaller ones from 

 a slight subquadrate elevation ; clasp-filament long, slender, attenuated mesially, 

 with a subapical claw. Harpes divided, inner limb long, slender, terminating 

 in a slender comb. Harpagones lamellifomi, inner angles doubly bent and 

 rounded. 



Larva, Stage IV (plate 109, fig. 366). Head wider than long, strongly bulg- 

 ing at eyes, front margin somewhat prominent, medianly truncate; antennse 



