AEDES AUKOIDES 751 



Legs moderately long and slender; femora yellowlsh-wliite scaled below, with 

 black scales above and a black ring before the tip; knees white-scaled; tibiae 

 largely white-scaled below, black above, tips of hinder pair black; tarsi black 

 scaled, the basal joint beneath with white scales, becoming fewer outwardly, the 

 terminal joints entirely black. Claw formula, 1.1-1.1-1.1. 



Length : Body about 4.5 mm. ; wing 4 mm. 



Male. — Proboscis long and slender, straight, black scaled. Palpi exceeding 

 the proboscis by the length of the last joint; end of long joint and last two joints 

 somewhat swollen and with dense long hairs, black with brownish luster; vesti- 

 ture black. Antennae plumose, the last two joints long and slender, rugose, 

 pilose, black, the others short, blackish ; hairs of whorls long, dense, brownish- 

 black. Coloration simUar to the female, the sides of the mesonotum paler, of 

 a whitish golden yellow without any brown tint. Abdomen elongate, depressed, 

 the segmental white bands broader and more produced at the sides; lateral cilia- 

 tion of long and abundant fine pale hairs. Wings narrower than in the female, 

 the stems of the fork-cells longer, the vestituxe less abundant. Claw formula, 

 1.1-1.1-1.1, 



Length : Body about 5 mm. ; wing 4 mm. 



Genitalia (plate 26, fig. 177) : Side-pieces more than twice as long as wide; 

 apical lobe well developed, prominent, continued narrowly along the side-piece ; 

 basal lobe prominent, roundedly quadrate, densely setose and with a stout seta 

 near its base. Clasp-filament slender, moderate, nearly uniform, notched 

 towards apex and bearing a few fine setae, a long articulated terminal spine. 

 Harpagones with a moderately long columnar base, its basal portion somewhat 

 thicker than the outer portion, minutely setose inwardly, bearing a rather small 

 terminal filament, elliptical, with attenuated pointed tip. Harpes elliptical, 

 concave, curved, inner margin thickened and revolute, tip pointed and curved 

 outward. Unci approximate, revolute, forming a small basal cylinder. Basal 

 appendages remote, bearing four or five stout terminal setae. 



Larva, Stage IV (plate 133, fig. 427). — Antennae cylindrical, slightly curved, 

 rather sparsely spined ; a moderate tuft just beyond basal third ; a long spine, 

 two short ones, and a digit at tip. Dorsal head-hairs in twos, ante-antennal tufts 

 four-haired. Mental plate triangular, with a central tooth and thirteen on each 

 side, the basal ones more remote and pointed, the last small. Mandible quadran- 

 gular, with slight dentitions on outer margin ; two filaments from a notch before 

 tip; an outer row of cilia from a collar; a row of filaments on outer margin; 

 dentition of four teeth on a process, the first and third long ; a spine before, two 

 small teeth at base, a flat filament and five curved feathered hairs within ; proc- 

 ess below broad and thick, widely furcate, with four hair patches ; basal angle 

 prominent, with a row of long hairs within ; a row of long hairs at base. Maxilla 

 shortly conical, divided by a band-shaped suture; inner half with lower part 

 prominent, angularly inflected in the middle ; a marginal and submarginal row 

 of cilia and a patch within near the suture, a tuft of long hairs at tip; outer 

 half with a band of hairs and two long articulated filaments next the suture ; 

 palpus short and stout, with four small terminal digits and a central promi- 

 nence. Air-tube tapered, about three times as long as wide ; pecten teeth evenly 

 spaced, not reaching the middle, followed at about the middle by a single tuft 

 of about four hairs ; single pecten-tooth a stout spine with three teeth on basal 

 half. Lateral comb of eighth segment of about fourteen scales in a triangular 

 patch; single scale drawn out into a long stout thorn, sides with a few small 

 spinules. Anal segment longer than broad, ringed by the plate ; dorsal tuft a 

 brush and hair on each side ; a lateral hair ; ventral brush well developed, con- 

 fined to the barred area; anal gills well developed, longer than anal segment, 

 tapered to a point. 



