280 MOSQiriTOES OF NORTH AMERICA 



Legs moderate, femora whitish beneath almost to tip ; knees white ; tibiae and 

 tarsi brownish black with a slight brassy reflection beneath ; hind tarsi with very 

 narrow yellowish-white bands at base and apex of each joint; mid tarsi with the 

 first three joints white-marked; front tarsi unmarked; apices of tibiae yellowish 

 white. Claw formula, 0.0-0.(M).0. 



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



Male. — Proboscis straight, thickened towards apex, bronzy brown, without 

 distinct pale markings. Palpi exceeding the proboscis by the length of the last 

 two joints ; end of long joint and last two joints with long, dense, black hairs ; 

 vestiture black with bronzy luster, a very narrow white ring below middle of 

 long joint, a patch of whitish scales at base of penultimate joint. Antennas 

 plumose; last two joints long and slender, rugose, pilose, black, the others short, 

 pale, with black rings at insertion of hair- whorls; hairs long, dense, black. 

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

 of the fork-cells a little longer; vestiture sparse. Abdomen elongate, depressed 

 on apical half; dorsal white bands broad on basal segments and hardly mesially 

 produced, narrower on sixth and seventh segments and produced on the sides; 

 lateral ciliation long, dense, fine, pale. Claw formula, 1.1-1.1-0.0. 



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



Genitalia (plate 15, fig. 113) : Side-pieces over twice as long as wide, conically 

 tapered at tip ; marginal appendages on a subapical truncated prominence con- 

 sisting of three rods with hooked tips and a leaf -like appendage and two setae. 

 Clasp-filament stout, rather long, curved, with a small articulated appendage. 

 Harpes furcate, lower branch curved, with a rounded tip, outer bearing a dense 

 terminal tuft of spines. Harpagones furcate, divided into numerous teeth. 



Larva, Stage IV (plate 97, fig. 319). — ^Head rounded, widest through eyes, 

 a large notch at insertion of antennae, front margin arcuate ; both pairs of dorsal 

 hairs in threes, ante-antennal tuft multiple. Antennae large, slightly curved, 

 basal two-thirds thick and well spined, terminated in a notch with a large hair- 

 tuft; two long setas subapicaUy, a long seta, a short seta, and a digit on a 

 pedicel at tip. Mental plate triangular, straight on the sides ; a large central 

 tooth and nine on each side, the last one small, the two before distinctly pro- 

 jecting. Mandible elongated, quadrangular; two filaments and a tuft of hairs 

 before tip ; an outer row of cilia from a collar ; a row of rounded transverse 

 prominences on outer margin bearing hair-tufts; dentition of four teeth on a 

 process, the first longest; a spine before, a small tooth and a larger trifid one at 

 base, a long smooth filament and row of feathered hairs within ; process below 

 curved, obscurely furcate, with a transverse and a longitudinal row of hairs and 

 a tuft at tip of each limb ; basal angle small, a row of stout hairs within with en- 

 larged feathered bases ; a row of long hairs at base. Maxilla elongate, conically 

 tapered, divided by a suture; inner half with a row of long spines on inner 

 margin, some of the basal ones shortly feathered, two rows of setae within; a row 

 of long hairs at tip running doAvn along the suture ; outer half with two fila- 

 ments at middle, a subapical spine on the outer side and slight irregularities on 

 outer margin. Palpus small, rather slender, with four irregular apical digits. 

 Thorax rounded, ^dder than long; abdomen moderate, the anterior segments 

 shorter; skin pilose; tracheae broad; lateral hairs apparently in twos (broken) ; 

 subdorsal hairs very long. Air-tube long, strongly tapered to about the middle, 

 then straighter, five times as long as wide ; pecten very long, running nearly to 

 middle ; single teeth rather wide, with about five branches, except toward' the 

 apex, where the teeth become thickened and spine-like, the branches reduced and 

 apically placed; a hair at end of pecten, another beyond, somewhat laterally 

 placed, a subapical tuft. Lateral comb of eighth segment of many spines in a 



