646 MOSQUITOES OF NORTH AMERICA 



the stiff outstanding bristles pale brownish; tarsi black, ringed with white on 

 both ends of joints, narrowly and obscurely so on front and middle legs, of which 

 the last three joints are wholly black, broadly and pure white, contrasting, on the 

 hind legs, the last joint wholly white. Claw formula, 1.1-1.1-0.0. 



Len^h : Body about 4 mm. ; wing 3.5 mm. 



Male. — Proboscis slender, straight. Palpi as long as the proboscis, slender, 

 the last two joints very slightly enlarged; vestiture black, bases of last two 

 joints broadly ringed with white, a white patch near base of long joint; hairs on 

 last two joints and apex of long joint sparse, small, black. Antennae plu- 

 mose; last two joiats long and slender, the others short, white, a brown riag 

 at origins of hair-whorls ; hairs long and blackish, lustrous. Coloration similar 

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

 fork-cells nearly the same, the vestiture less abundant. Abdomen elongate, 

 densely and coarsely hairy at the sides; dorsum with the white scales forming 

 broad, basal, segmental bands. Claw formula, 2.1-2.1--0.0. 



Length : Body about 4 mm. ; wing 3 mm. 



Genitalia (plate 31, fig. 309) : Side-pieces about three times as long as wide, 

 tip conically rounded, apical lobe absent, basal lobe shortly quadrate, densely 

 covered with stiff setae with tubercular bases. Clasp-filament long and slender, 

 slightly swollen medianly, with a long articulated terminal spine. Harpes 

 slender, rather long, margins narrowly revolute, apex tapering to a small point 

 which is bent sharply over. Harpagones with a stout long cylindrical base, 

 curved in an arc, with a terminal articulated filament, long, ligulate, the tip 

 slightly tapered, reaching to outer fourth of side piece. Unci membranous, 

 indistinguishable. Basal appendages small, bearing four short stout setae. 



Larva, Stage IV (see figure of the entire larva, plate 75). — Head rounded, 

 subquadrate, the sides straight, a notch at insertion of antennae, front margin 

 broadly arcuate. Antennae cylindrical, slender, smooth, a single long hair 

 near middle ; three unequal spines and a digit on a pedicel at tip. Eyes small, 

 round, with a central hair. Both pairs of dorsal head-hairs single ; ante-anten- 

 nal tuft four-haired. Mental plate triangular, with a central tooth and ten teeth 

 on each side, the basal ones smaller and more remote. Mandible quadrangular, 

 a few small spines at base; two filaments near tip, an outer row of cilia from a 

 collar; fourteen filaments on outer edge, the outer ones more scattered; denti- 

 tion of four teeth on a process, the first the largest; a tooth before, two small 

 ones and a setose projection at base, a flat serrate filament and four slender ones 

 within ; process below cleft-furcate, hairy at tip and with a row of hairs down 

 the middle ; basal angle large, four filaments within ; a row of coarse hairs at 

 base. Maxilla irregularly spherical, divided by a suture, outer half lunate, much 

 smaller than inner; hairs of inner half erect, a group of obtuse processes in 

 middle of inner side, the long hairs near tip directed inwardly ; outer half with 

 a row of hairs ; two filaments at suture ; palpus nearly four times as long as wide, 

 smooth, with four digits, of which two are small and one of them subapical. 

 Thorax rounded, wider than long, anterior margin nearly straight. Hairs 

 abundant, except on prothorax which is weakly and shortly haired. Abdomen 

 long, posterior segments more elongate, submonilif orm ; hairs short, the lateral 

 tufts two-haired from first to fifth segments, single on sixth ; secondary hairs 

 well developed, but not long. Tracheal tubes rather broad, band-shaped, 

 slightly "expanded in each segment, narrowed and tubular in seventh segment, 

 expanded in thorax. Air-tube stout, conically tapered outwardly, two and a 

 half times as long as wide; pecten occupying less than basal third, the teeth 

 evenly spaced; single tooth a long tapered spine with short broad base from 

 which arise two small spines; a three-haired tuft before middle of tube, well 

 beyond pecten. Lateral comb of eighth segment of few scales in a small patch, 



