556 MOSQUITOES OF NORTH AMERICA 



black hairs, a pale ring devoid of scales at the false articulation of long joint. 

 Antennae plumose, the two terminal joints long and pilose, the rest short, black 

 at insertions of the whorls, white beyond; second joint pale at base; hairs of 

 whorls long, blackish. Coloration similar to the female. Abdomen elongate, 

 strongly depressed, with long, pale, lateral ciliation ; the yellowish white lateral 

 spots are on the dorsal aspect ; venter with basal segmental bands of blue-black 

 scales. Wings much narrower than in the female, with hardly any trace of 

 smoky tint, the stalks of the fork-cells slightly longer, cross-veins more remote, 

 scales sparser. Claw formula, 2.1-2.1-1.1. 



Length : Body about 4.5 mm. ; wing 4.2 mm. 



Genitalia (plate 20, fig. 146) : Side-pieces about twice as long as wide, conical 

 at tip, lobes scarcely differentiated. Clasp-filament small at base, greatly 

 inflated beyond middle, extreme tip again slender, recurved, and with a small 

 articulated terminal spine. Harpes concave, margins narrowly revolute, bearing 

 an apical tooth. Harpagones with a long, slender stem nearly reaching to tip 

 of side-piece, apex a little expanded and bearing a row of about seven stout hook- 

 tipped setae and a single leaf -like appendage with a recurved tip. Unci forming 

 a tapering plate with revolute margins. 



Larva, Stage IV (plate 115, fig. 390). Head rounded, wider than long, nar- 

 rowed before the eyes, a slight notch at insertion of antennae, front margin 

 broadly arcuate. Antennae very long, longer than head, slender, a little swollen 

 toward base, spined all over ; a large tuft of long branched hairs a little before 

 middle ; three long spines and two small digits at tip. Eyes large, transverse, 

 pointed. Both pairs of dorsal head-tufts double, ante-antennal tuft multiple. 

 Mental plate triangular, with a central large tooth and thirteen on each side, 

 rather small, alike, closely set. Mandible quadrangular, indented without at 

 middle, smooth ; two long filaments before tip ; an outer row of stout cilia ; nine 

 little tufts of two hairs each from conical projecting bases ; dentition of four 

 teeth on a process, the first and fourth longer ; a filament without, small sepa- 

 rated teeth at base, a double serrate filament and seta within; process below 

 simple, with patches of hair; an angle below it; two groups of three long hairs 

 each; six long hairs at base. Maxilla elongate hemispherical, divided by a 

 narrow suture ; inner half spined ; a row of long cilia on suture at tip ; outer half 

 with some rudimentary spines toward palpus and a short filament on each side. 

 Palpus small and slender with two digits and two small rudimentary ones. 

 Thorax rounded, wider than long, robust ; hairs abundant but not long. Abdo- 

 men stout, anterior segments shorter; lateral tufts multiple on first segment, 

 double on second, single on third to sixth. Tracheal tubes broad, band-shaped, 

 irregularly flexuous posteriorly. Air-tube large, strongly inflated, tapered on 

 outer half, about three times as long as wide; pecten of three teeth on basal 

 fifth of tube ; single tooth with broad base, a long spine at one end, three sub- 

 basal ones, the middle one longest. Lateral comb of eighth segment of six or 

 seven subequal scales in a line ; single scale three times as long as wide, with a 

 long terminal spine and five stout spines on each side, the subapical one slightly 

 curved. Anal segment much longer than wide, ringed by the plate ; dorsal tuft 

 a long hair and brush on each side ; a small lateral tuft ; ventral brush well de- 

 veloped, extending along ventral line to near base. Anal gills long, much longer 

 than the segment, tapered to a sharp tip; a slight central trachea. 



Pupa (plate 149, fig, 705). Thoracic mass subpyriform; three small tufts 

 anteriorly; air-tubes rather long, slender, slightly notched at tip; abdomen 

 rather stout, the hairs and tufts moderate, a small lateral tuft on eighth seg- 

 ment ; anal paddles with two small terminal hairs. 



Egg (plate 146, fig. 675). Fusiform, flattened on one side, rather long and 

 narrow; sculpture elongate hexagonal reticulations; from the micropylar end 



