MOSQUITO BIOLOGY 99 



"Prothoracic lobes lateral, small, elliptical. Mesonotum narrow, 

 depressed, brown, three darker longitudinal stripes on the disk, grayish 

 pruinose on posterior third, sides behind middle dark brown ; vestiture 

 of coarse pale yellowish hair scales, densest over the three dark stripes, 

 some stiff bristles over roots of wings. Scutellum collar-like, dark 

 brown, with a marginal row of pale brown bristles. Postnotum ellipti- 

 cal, prominent brown, nude. Pleurae and coxae brownish luteous, with 

 a few short hairs. 



"Abdomen subcylindrical, somewhat depressed, truncate at tip, lute- 

 ous brown, the apices of the segments broadly blackish; vestiture of 

 numerous pale bristles arising from small black punctures. 



"Wings moderate, hyaline; petiole of second marginal cell shorter 

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

 cross-vein distant about its own length from anterior cross-vein ; scales 

 of veins lanceolate, narrow, of different lengths on different areas, the 

 long ones black, the short ones brown, the black scales denser and form- 

 ing spots at the bases of the second marginal and second posterior cells, 

 at the cross-veins and origin of second vein. Halteres with pale stem and 

 black knob. 



"Legs long and slender ; vestiture brownish black, tips of femora and 

 tibiae narrowly yellowish white. Claw formula, 0.0-0.0-0.0. 



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



"Male. Palpi as long as the proboscis, the last two joints swollen and 

 club-shaped, with many long brown hairs with yellow silky luster ; vesti- 

 ture bronzy black. Antennae plumose; last two joints long and slender, 

 rugose, pilose, black, the others short, pale, with narrow black basal 

 rings ; hairs of whorls long, dense, brownish with yellow silky luster. 

 Coloration as in the female. Abdomen long, depressed, somewhat broad- 

 ened distally, black, the margins of the segments narrowly luteous, hairs 

 of dorsum yellowish ; lateral ciliation coarse and irregular, brown. 

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

 ture more sparse. Claw formula, 2—0.0-0.0. 



"Length : Body about 5.5 mm. ; wing 4.5 mm. 



"Genitalia : Side-pieces longer than wide, conical, a stout seta at mid- 

 dle, at base two spines from a common base, an inner setose lobe bearing 

 four unequal spines in two groups, the outer pair with rounded tips. 

 Clasp-filament as long as side-piece, slender, slightly enlarged at base 

 and apex, with a short and stout articulated terminal spine. Unci slen- 

 der, columnar, with two tufts of spines at tip, bent outward at right 

 angles. Basal appendages large, delicate, leaf-like. 



"Larva, Stage IV. Head rounded, longer than wide, bulging at the 



