AEDES FUSCUS 731 



Male. Proboscis rather stout, slightly enlarged towards apex, nearly straight. 

 Palpi one-seventh the length of the proboscis, uniform, slender; vestiture black. 

 Antennffi plumose, the last two Joints long and slender, pilose, black, the others 

 shorter, white, blackish at insertions of hair-whorls ; hairs of whorls long, dense, 

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

 stems of the fork-cells longer, vestiture less abundant. Abdomen elongate, 

 slender, somewhat depressed and broadened towards apex ; basal segmental bands 

 broader and whiter than in the female, the last segment entirely white scaled; 

 lateral ciliation coarse, irregular, pale. Claw formula, 1.0-1.0-1.1. 



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



Genitalia (plate 34, fig. 226) : Side-pieces about twice as long as broad, taper- 

 ing to a small rounded tip, no apical lobe, two basal lobes, the dorsal one consist- 

 ing of two slender processes joined at base and bearing one and three hairs 

 respectively, the inner one consisting of a rounded conical process, densely 

 setose. Clasp-filament subapically situated, double, the apical arm slender, 

 curved, widely furcate at tip, with a small articulated spine on one of the forks, 

 the basal arm about half as long as the other, rounded, with a group of setge at 

 the tip. Harpes small, elliptical, inner margin revolute, tip bluntly rounded, 

 without point. Harpagones absent. Unci slender, approximate, incurved, tips 

 furcate. Basal appendages long, capitate, remote at their origins, tips approxi- 

 mated to lower basal lobe of side-piece, densely setose. 



Larva, Stage IV (see figure of the entire larva, plate 70). Head broad, 

 rounded, narrowed before eyes, notched at insertion of antennae, front margin 

 broadly arcuate. Antennae rather long, subcylindrical, slightly tapered beyond 

 middle, uniformly covered with rather coarse spines, a moderately long hair tuft 

 at middle; a rather long terminal spine, three subequal shorter ones, and a 

 small digit on a pedicel. Eyes large, transverse, pointed. Both pairs of dorsal 

 tufts and ante-antennal tufts multiple and long. Mental plate long, triangular, 

 terminal tooth moderately stout, with twelve lateral teeth on each side, basal 

 ones becoming more remote, with rounded intermedial incisions. Mandible 

 quadrangular, convex without, outer marginal portion long ; one pair of append- 

 ages before tip ; an outer row of cilia arising from a strong collared prominence ; 

 nine filaments on front margin arising from angular incised bases ; dentition of 

 four subequal teeth on a constricted prominence, two filamentous teeth before, 

 several short irregular ones at base, two broad filaments within, the lower ser- 

 rate ; interior lobe with a finger-shaped furcation and patches of fine hair ; inner 

 angle sharp, produced, five hairs within ; a row of long hairs at base. Maxilla 

 elliptical, divided by a narrow suture ; inner half with a prominent angle above 

 the middle, from which arises a small brush of hairs; a row of hairs at apex; 

 inner surface covered with short hairs which form a small patch on outer half 

 about the two filaments near the suture ; palpus small, strongly constricted cen- 

 trally, with three rather large and two minute terminal digits. Mouth-brushes 

 moderate, normal. Thorax rounded, transverse, wider than long; hairs mod- 

 erate, rather short, the subdorsal mesothoracic ones short and single. Abdomen 

 elongate, anterior segments short, transverse, posterior ones more elongated, 

 seventh segment elongate quadrangular ; lateral hairs of third to sixth segments 

 single, secondary hairs minute. Tracheal tubes broad, band-shaped, roundedly 

 expanded outwardly in the segments. Air-tube stout, rather long, tapered out- 

 wardly, about three and a half times as long as wide ; pecten reaching beyond 

 middle of tube, the three distal teeth detached, remote, followed by a small hair- 

 tuft at outer third. Lateral comb of eighth segment of few scales in a partly 

 double row; single scale elliptical, with a long apical process as long as body 

 of scale, fringed with short hairs before the process. Anal segment longer than 

 wide, the dorsal plate large, reaching near the ventral line ; dorsal hairs a long 

 hair and brush on each side ; a minute tuft near posterior angle of plate ; ventral 



