316 MOSQUITOES OF XORTH AMERICA 



Prothoracic lobes elliptical, remote dorsally, with pale scales and brown 

 bristles. Mesonotum light brownish red, with two narrow obscure paler lines; 

 vestiture of small, narrow, curved, bright golden-brown scales, those around 

 ante-scutellar space paler, and rows of dark setae. Scutellum trilobate, brown, 

 clothed with minute, curved, pale-ochraceous scales, each lobe with a tuft of 

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

 Pleurae and coxse reddish luteous, with remote patches of narrow, elliptical, 

 whitish scales and rows of small brown bristles. 



Abdomen subcylindrical, truncated at tip ; dorsal vestiture dull black, a mod- 

 erately narrow ill-defined ochraceous soiled band at base of each segment, widen- 

 ing on sides ; first segment with a patch of whitish and black scales on the dor- 

 sum and with pale hairs ; venter sordid ochraceous scaled. 



Wings ample, hyaline; petiole of second marginal cell one-fifth as long as 

 its cell, that of second posterior cell somewhat shorter than its cell ; basal cross- 

 vein more than its own length distant from anterior cross-vein ; scales brownish 

 black with a blue reflection on costa, outstanding one long, linear, denser on forks 

 of second and fourth veins. Halteres whitish, with reddish knobs. 



Legs moderate, femora yellowish white on underside to tip, slender ; vestiture 

 othenvise brown with a bluish reflection above and a strong brassy one beneath ; 

 knees and tips of hind tibife yellowish white. Claw formula, 0.0-0.0-0.0. 



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



Male. Proboscis long and slender, slightly enlarged towards apex, with a 

 pale shade beneath, particularly towards apical half. Palpi exceeding proboscis 

 by nearly the length of the last two joints, which with the end of the long joint 

 bear many black hairs, yellow at base of penultimate joint ; vestiture of dark 

 scales with a strong bronzy luster, a small patch of white scales above at base of 

 penultimate joint, a patch of silvery scales beneath at bases of last two joints ; a 

 line of pale shining scales along under surface. Antennas plumose; last two 

 joints long and slender, rugose, pilose, black, the others short, whitish, ringed 

 with black at insertions of hair-whorls ; hairs long, black, brownish at base. 

 Coloration similar to the female. Wings narrower than in the female, the stems 

 of the fork-cells slightly longer; vestiture somewhat sparser. Abdomen long, 

 subcylindrical and slencler basally, depressed and somewhat expanded towards 

 apex; dorsal segmental pale bands broad and expanded laterally, reaching apices 

 on sixth and seventh segments, last segment all pale-scaled above ; lateral cilia- 

 tion abundant, very long, pale yellow. Claw formula, 1.1-1.1-0.0. 



Length : Body about 4 mm. ; wing 3.5 mm. 



Genitalia (plate 16, fig. 115) : Side-pieces more than twice as long as wide, 

 tips conically tapered, marginal appendages on a truncate subapical prominence 

 consisting of three rods with hooked tips, a leaf-like appendage and two setas. 

 Clasp-filament moderate, rather stout, curved, with a rather long, articulated, 

 terminal spine. Harpes furcate, the outer arm long, curved, simple, the inner 

 with a tuft of dense spines at apex. Harpagones furcate, the inner branch short, 

 pointed, the outer divided into numerous overlapping teeth. Basal appendages, 

 small, remote, bearing a few sette. 



Larva, Stage IV (plate 102, fig. 339). Head rounded, mdest through eyes; 

 antennae long and rather stout, a large tuft at outer third, part beyond it slender, 

 basal part of shaft spinulose; upper head-hairs in fives, lower in threes, ante- 

 antennal tuft multiple. Body with skin smooth ; lateral abdominal hairs in 

 twos after second segment ; lateral comb of eighth segment of many spines in a 

 large triangular patch. Air-tube straight, slightly and gradually tapering to 

 tip, seven times as long as wide ; tenninal hooks minute ; pecten of thirteen small 

 teeth on basal fourth of tube, followed by five rather small two or three-haired 



