204 MOSQUITOES or NOETH AMERICA 



veins narrowly ovate to ligulate, a few with eubtruncate apices, densest and 

 broadest on forks of second vein ; bronzy brown, with blue reflection along costa. 

 Halteres pale with brown knobs. 



Legs long and slender, the middle femora slightly stouter than the others; 

 vestiture of bronzy-brown scales, with a blue reflection in some lights ; femora 

 yellowish beneath. Claw formula, 0.0-0.0-0.0. 



Length : Body about 4.5 mm. ; wing 3.5 mm. 



Male. — Proboscis moderately long and slender, uniform, a suture near the 

 middle, the scales before it roughened. Antennas very long, exceeding the body 

 in length ; second joint fourteen times as long as wide, third joint about eight 

 times as long as wide, the succeeding ones progressively shorter, the penultimate 

 one about four times as long as wide, the last joint thickened, about twice as 

 long as wide. Hairs of whorls sparse, shorter than in the female, obscured by 

 the coarse ciliation. Palpi very short, about one-seventh as long as proboscis. 

 Coloration as in the female. Wings much as in the female, the stems of 

 the fork-cells about the same. Abdomen subcylindrical, somewhat enlarged 

 apically, more hairy than in the female. Claw formula, 1.0-1.0-0.0. 



Length : Body about 4.5 mm. ; wing 3.5 mm. 



Genitalia (plate 8, fig. 53) : Side-pieces over twice as long as wide, stout, a 

 rounded conical apical lobe on the inner angle bearing fine setae, a prominence 

 at middle of inner margin bearing two short stout bladders and a stout rod. 

 Clasp segment small, stout, and chitinized like the side-pieces, constricted near 

 base, enlarged apically, and bearing two stout equal terminal claws, outer aspect 

 densely clothed with fine hairs. Harpes broad, rounded, terminal margin 

 furnished with a row of about sixteen stout, fine even teeth. Harpagones divided 

 into three parts, the middle one with a row of fine sharp teeth inwardly, the 

 inner one with the tips pointed and curved inward, not as long as the harpes ; 

 outer portion very long, broad at base, tip spatulate, reaching beyond the lateral 

 process of side-piece, smooth. Unci forming a basal cone, the tips divided into 

 teeth. 



Larva, Stage IV (see the figure of the entire larva, plate 48) . — ^Head round, 

 nearly circular from dorsal view, a delicate angular process at side from beneath, 

 a shallow notch at insertion of antennae, front margin broadly arcuate. Antennae 

 cylindrical, sparsely spined, a tuft at middle; two spines shortly subapical, two 

 spines and a digit at tip. Eyes very small, rounded. Upper dorsal tufts triple, 

 lower double, ante-antennal tuft multiple. Mental plate'membranous, triangu- 

 lar, a central tooth and five on each side, very long and slender, the last two with 

 an apical hair-tuft, the last tooth short. Mandible with a long curved basal 

 process outwardly, bearing a tuft of coarse hairs at tip and fitting into the lobe 

 on underside of head; three filaments before tip; an outer row of cilia from a 

 collar ; a row of short spines on the outer edge ; dentition reduced, a slender trifid 

 prominence, the basal tooth short and truncate; a slender filament and some 

 hairs within; process below long and slender, curved downward, with two 

 patches of hair ; edge strongly emarginate below, with three stout hairs ; basal 

 angle small but sharp ; a row of stout hairs at base. Maxilla elongate, divided by 

 a band-shaped suture; inner half coarsely hairy, except toward the suture; a tuft 

 of long hairs at tip ; outer half with smaJl filaments near the suture preceded by 

 a group of hairs. Palpus small, tapering to tip, with moderately long terminal 

 digits. Thorax small, wider than long, the hairs abundant and long. Abdomen 

 moderate, anterior segments slightly shorter, seventh segment long; lateral 

 hairs multiple on first segment, double on second to fifth, single on sixth, longer 

 posteriorly, longest on sixth. Tracheal tubes broad, band-shaped. Air-tube 

 stout, tapered on outer half, four times as long as wide; a tuft of two hairs at 



