982 MOSQUITOES OF NORTH AMERICA 



base and another before apex ; fringe dark, spotted with white at ends of veins. 

 Halteres whitish, with dark knobs. 



Legs long and slender; femora clothed on outer side with black scales and 

 some yellow ones intermixed, a small black ring just beyond base, middle and 

 hind pairs with two white spots just before apex, under side continuously yel- 

 lowish except at apex; tibiae black, a yellow line on inner side; knees white; 

 tarsi black with some yellow scales intermixed; front tarsi with first, second, 

 and third joints broadly ringed with white ; mid tarsi without distinct marks ; 

 hind tarsi with apical half of second joint, all of third and fourth joints white, 

 a black ring at basal third of fifth joint. Claw formula, 0.0-0,0-0.0. 



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



Male. Palpi as long as the proboscis, the last two joints thickened into a 

 distinct club and bearing long black and yellowish hairs ; last joint with apical 

 two-thirds silvery-white scaled, base black; penultimate joint narrowly white 

 scaled at apex; long joint white scaled at apex and with a median white ring. 

 Antennae densely plumose; last two joints slender, rugose, pilose, black, the 

 others short, pale, with blackish rings bearing long, dense, silky brown hairs. 

 Coloration as in the female. Abdomen long, depressed, rather narrow, very 

 slightly expanded beyond middle ; lateral ciliation of rather short, coarse yellow- 

 ish hairs. Wings narrower than in the female, the stems of the fork-cells longer ; 

 vestiture more sparse, the black spots along the costa less extensive. Claw 

 formula, 2-0.0-0.0. 



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



Genitalia (plate 39, fig. 264) : Side-pieces twice as long as wide, tapering, 

 the tips rounded; clasp-filament long and slender, about as long as the side- 

 piece, medianly slightly attenuated, terminally a short inserted claw, preceded 

 by a small seta ; two approximated coarse spines with recurved tips arising 

 from a peduncle near middle of side-piece and a single slenderer spine further 

 inward ; a stout rod from a peduncle at extreme base ; false harpes long, smooth ; 

 unci forming a basal plate with deep central notch. 



Larva, Stage IV. Head elongate, rounded, bulging at the sides, antennae 

 laterally inserted, portion before antennae conically produced ; four dorsal head- 

 hairs in a line between antennae, single but amply feathered, a small hair at base 

 of antennae; two long approximate spines on clypeus. Antennae rather large, 

 subcylindrical, slightly tapered, spined throughout, spines on inner side very 

 coarse; a tuft of feathered hairs from basal fourth; two long terminal digits, 

 two short ones and a long slender hair-tuft. Eyes large, normal. Mental plate 

 with a rounded apical tooth and four on each side; first three evenly spaced, 

 fourth small and basally situated. Mandible quadrangular ; a row of branched 

 hairs on dorsal aspect near base, followed by a little tuft and two small fila- 

 ments; five long filaments before tip; an outer row of cilia; eight feathered 

 filaments on outer margin; terminal dentition produced, of five small teeth, 

 the third the largest ; two serrate filaments within ; a long dentate process below, 

 composed of confluent spines ; basal angle roundedly upcurved ; a row of long 

 hairs at base. Maxilla rounded rectangular, concave on outer margin, inner 

 angle shorter ; densely covered with short curved hairs ; two small approximate 

 filaments crossing an indistinct suture ; palpus obliquely attached, conical, with 

 a large dendritic tuft without, numerous short appendages at tip, some of which 

 are spatulate. Thorax subquadrate, about as long as wide; hairs short, con- 

 sisting of branched hairs, single hairs and tufts; meso thorax sparsely haired. 

 Abdomen stout, anterior segments shorter ; long feathered lateral hairs on first 

 three segments, double on first and second, single on third ; hairs on succeeding 

 segments small, smooth; a series of well-developed subdorsal fan-shaped tufts 

 on second to seventh segments (plate 130, fig. 460) ; a pair of smaller ones on 

 the first segment. Air-tube sessile, subquadrate, roundedly angled posteriorly. 

 Lateral plates of eighth segment posteriorly with a series of spines, irregu- 



