256 MOSQUITOES OF NORTH AMERICA 



very narrow, pale-brown bands at base and apex of each joint ; fore and mid tarsi 

 unbanded; tibise yellowish at tips. Claw formula, 0.0-0.0-0.0. 



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



Male. Palpi exceeding proboscis by nearly the length of the last two joints, 

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

 joint thickened, the last tapered to tip ; vestiture brown with strong bronzy 

 luster, without pale rings. Antenna 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 ^\^th distinct dull-white bands at bases of segments dorsally, 

 the sides densely hairy. Claw formula, 1.1-1.1-0.0. 



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



Genitalia (plate 16, fig. 120) : Side-pieces over twice as long as wide, coni- 

 cally tapered at tip ; marginal appendages on a subapical truncated prominence 

 consisting of three rods with hooked tips and a leaf-like appendage and a seta. 

 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. 

 Basal appendages rounded, setose. 



Larva, Stage IV (plate 96, fig. 313). Head rounded, widest through eyes, 

 bulging on sides, a large notch at insertion of antenna, front margin arcuate; 

 both pairs of dorsal head-hairs in threes, the ante-autennal tufts multiple. 

 Antennfe large, basal two-thirds thick, spined ; a large tuft at outer third from a 

 notch ; two long spines subapically, a long spine, a short one, and a digit at tip. 

 Mental plate triangular, straight on sides ; a large central tooth and eleven on 

 each side, basal ones a little more remotely spaced, last one small. Mandible 

 quadrangular; three filaments and a tuft of hairs before tip; an outer row of 

 cilia from a collar; a row of transverse rounded prominences on outer margin, 

 each bearing a hair and a tuft of short ones ; dentition of four teeth on a process, 

 the first longest; a spine before, a tooth at base, a long serrate filament, and row 

 of feathered hairs within; process below long, obscurely furcate, with a longi- 

 tudinal and a transverse row of hairs and a tuft at end of each limb ; basal angle 

 moderate, with row of stout hairs ^dthin ; a row of hairs at base. Maxilla nar- 

 rowly elongate, tips conically rounded, divided by a suture ; inner half with two 

 rows of stout spines on margin and a row of cilia within ; a row of long hairs at 

 tip running down along the suture; outer half with two filaments below the 

 middle next the suture and a spine on the other side. Palpus small, tapered, with 

 four rather long apical digits. Body pilose ; thorax rounded, wider than long. 

 Abdomen moderate, anterior segments shorter; lateral hairs multiple on first 

 segment, triple on second, double on third to sixth ; subdorsal hairs long, in twos 

 on fifth to seventh segments ; tracheae broad. Air-tube long, tapering outwardly, 

 over seven times as long as wide ; pecten running over nearly basal third ; single 

 tooth broad, with five to seven side-branches ; three long two-haired tufts on pos- 

 terior margin, the middle one moved laterally out of line. Lateral comb of 

 eighth segment of many spines in a triangular patch ; single spine elongate, 

 widened at tip, fringed with spinules. Anal segment longer than broad, ringed 

 by the plate ; dorsal tuft a group of long hairs on each side ; ventral brush well 

 developed, confined to the barred area. Anal gills moderate, longer than the 

 segment, tapered to the rounded tip. 



The larvae occur in dirty water and artificial receptacles, being apparently 

 semi-domesticated. Mr. Busck found them in a dirty, slowly-running water- 

 course across a road and in water of a flower-vase in a hotel parlor. 



