666 MOSQUITOES OF NORTH AMERICA 



with irregular black streaks, nude. Pleuras and coxae brown, clothed with ellip- 

 tical, flat, pure white scales and rather numerous short bristles, which are pale 

 on the pleurae but blackish on the anterior coxae. 



Abdomen subcyliadrical, posterior segments tapering; dorsal vestiture of 

 black scales, a broad, irregular median stripe of sordid yellowish white ones, a 

 transverse band of the same color at base of each segment; along the sides a 

 row of median segmentary pure white patches, larger posteriorly; in some speci- 

 mens the median stripe is represented by a series of quadrate segmental spots ; 

 first segment with a patch of yellowish white scales and with many fine pale 

 hairs; venter clothed with black and white scales, the white predominating, 

 the black forming a diffused median line. Cerci black. 



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

 cell, that of second posterior cell also shorter but less markedly so ; basal cross- 

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

 rather broad, a slight denser aggregation of scales at base of third vein and 

 furcation of second; outstanding scales along second and third veins and along 

 ends of all the veins linear, black. Halteres entirely pale. 



Legs rather slender; femora clothed with black and white scales, the black 

 ones predominating dorsally, extreme tips white ; tibiae with pure white and 

 black scales intermixed, the black predominating, a broad black apical ring and 

 a very narrow white basal spot, the stout erect setae dark brown ; tarsi black, 

 each joint of hind tarsi with a broad white basal ring, the first joint also with 

 scattered white scales, the last entirely white ; fore and mid tarsi with the white 

 rings narrower, the last two joints entirely black. Claw formula, 1.1-1.1-0.0. 



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



Male. — Proboscis straight, slender, the white ring narrow and before the 

 middle. Palpi exceeding the proboscis by nearly the length of the last joint, 

 last two joints decidedly inflated ; vestiture of black scales, a narrow white ring 

 in middle of long joint and at bases of last two joints ; end of long joint and 

 last two joints with long dense hairs, black on end of long joint, partly pale 

 yellow on terminal joints. Antennae plumose, the last two joints long and 

 slender, rugose, pilose, black, the others short, dull luteous, with a very narrow 

 black ring at bases of hair-whorls; hairs long, dense, brownish-black. Color- 

 ation similar to the female. Wings narrower than in the female, stems of the 

 fork-ceUs longer but not as long as the cells ; vestiture sparse. Abdomen elon- 

 gate, depressed, with dense, pale, long, lateiral ciliation. Claw formula, 

 2.1-1.1-0.0. 



Length : Body about 5 mm. ; wing 4 mm. 



Genitalia (plate 31, fig. 212) : Side-pieces over twice as long as broad, apical 

 lobes absent, basal lobe small, conical, densely setose. Clasp-filament long and 

 slender, slightly swollen toward middle, with a long articulated terminal spine. 

 Harpes flat, concave, inner margin thickened and revolute, tip forming a small 

 outcurved point. Harpagones with a slender columnar stem slightiy longer 

 than harpes and a long slender ligulate articulated filament at apex. Unci 

 approximate, obscure, forming a short rounded-tipped cylinder. Basal append- 

 ages rudimentary, bearing a few short setae. 



Larva, Stage IV (plate 117, fig. 404).— Head rounded, prominent on the 

 sides, narrowed before eyes, front margin arcuate. Antennae subcylindrical, 

 sparsely spined ; tuft rather short, slightiy before the middle ; one long and three 

 shorter spines at tip and a digit on a pedestal. Eyes large, transverse, pointed. 

 Both pairs of dorsal head-hairs single, ante-antennal tufts multiple. Mental 

 plate triangular, wide, with a stout apical tooth and eleven teeth on each side, 

 the apical ones crowded, the basal ones more pointed and remote, the last small 



