MOSQUITO BIOLOGY 167 



pruinose on the disk, the margins ahnost silvery pruinose, two narrow 

 dark impressed bare longitudinal stripes reaching to antescutellar 

 space; vestiture of rather sparse yellowish short hairs on the disk, 

 scattered long and coarse blackish ones toward the sides and in a denser 

 series over the roots of wings ; antescutellar space strongly depressed. 

 Scutellum collar-like, lutcous brown, with a marginal row of long black 

 bristles. Postnotum elliptical, prominent, brown, nude. Pleurae luteous 

 brown with whitish reflections, coxae yellowish, with a few short hairs, 

 the anterior coxae with a row of long yellow brown bristles. 



"Abdomen subcylindrical, somewhat depressed, truncate at tip, 

 brown, the segments with black apical margins ; dorsal vestiture of 

 rather numerous and coarse brown bristles, longer ones at the sides. 



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

 as long as the cell, that of second posterior cell about as long as its 

 cell; basal cross-vein distant about its own length from anterior 

 cross-vein; outstanding scales of veins narrowly lanceolate to almost 

 linear, evenly distributed, uniformly brownish black, those on the costa 

 with a blue and bronzy reflection. Halteres with pale stems and black 

 knobs. 



"Legs long and slender; vestiture brownish black with a blue and 

 bronzy reflection. Claw formula, 0.0—0.0—0.0. 



"Length : Body about 3 mm. ; wing 3.5 mm. 



"Male. Palpi slightly longer than the proboscis, the last two joints 

 swollen, forming an elongate club, with a few coarse black bristles ; 

 scale vestiture bronzy black. Antennae plumose; last two joints long 

 and slender, rugose, black, pilose, the others shorter, whitish, with black 

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

 Coloration as in the female. Abdomen elongate, somewhat depressed, 

 broadened toward tip, black ; lateral ciliation long and rather dense, 

 brown. Wings narrower than in the female, the stems of the fork-cells 

 longer, the vestiture more sparse. Claw formula, 3.0-0.0-0.0. 



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



"Genitalia: Side-pieces scarcely longer than wide, rounded, a stout 

 seta on inner margin beyond the middle ; at base two long spines with 

 contiguous bases, a tuft of long fine hairs from a conical base. Clasp- 

 filament slightly longer than the side-pieces and slightly enlarged at 

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

 columnar, short, with a rounded tip. 



"Larva, Stage IV. Head rounded, elongated, longer than wide, taper- 

 ing before, frontal portion before insertion of antennae broadly and 

 somewhat flatly arcuate; hairs all very small, simple. Antennae sub- 



