AEDES HIESUTERON 745 



Abdomen subcylindrical, tapering posteriorly; dorsal vestiture black, with 

 rather narrow white basal segmental bands which widen to triangular patches 

 on the sides, the first segment with white scales and numerous fine pale hairs ; 

 venter entirely white-scaled. Cerci prominent, black. 



Wings moderate, hyaline ; petiole of second marginal cell slightly shorter than 

 its cell, that of second posterior cell about as long as its cell ; basal cross-vein 

 distant about its own length from anterior cross-vein ; scales brown, black on the 

 costa, the outstanding ones broadly linear. Halteres whitish, with darker knobs. 



Legs moderately long and slender ; femora yellowish-white scaled below, black 

 above and with a black ring before tip ; knees white scaled ; tibiae largely pale 

 scaled below, black above, the tips of hind pair black; tarsi brown with sub- 

 metallic luster and with pale scales beneath becoming indistinct outwardly. 

 Claw formula, 1.1-1.1-1.1. 



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



Male. Proboscis slender and straight, rather long. Palpi exceeding the 

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

 somewhat swollen ; vestiture brown ; hairs on end of long joint and the last two 

 joints long and abundant, brown with a whitish reflection in certain lights. 

 Antennae plumose, the last two joints long and slender, pilose, the others 

 shorter, blackish ; hairs of whorls long dense, brownish-black with silky luster. 

 Coloration similar to the female. Abdomen long, depressed, the white segmental 

 bands wider than in the female and more produced laterally; lateral ciliation 

 long, fine and abundant, pale yellow. Wings narrower than in the female, stems 

 of fork-cells longer, vestiture less abundant. Posterior tibiae with a fringe of 

 long, fine, rather dense hairs. Claw formula, 3.1-2.1-1.1. 



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



Genitalia (plate 26, fig. 180) : Side-pieces nearly three times as long as wide; 

 apical lobe well developed, prominent, continued broadly along side-piece to 

 basal lobe, which is conically prominent and bears numerous short setae, a stout 

 hooked spine with an attendant group of smaller spines. Clasp-filament slender, 

 moderate, slightly thickened medianly, notched towards apex and bearing a few 

 fine setae, a long, articulated terminal spine. Harpagones with a stout, thick, 

 nearly straight, curved columnar base with two small setae on inner side, 

 minutely setose, bearing an articulated terminal filament, short, widened in the 

 middle. Harpes elliptical, concave, curved, inner margin thickened and revo- 

 lute, tip pointed and curved outward. Unci approximate, revolute, forming a 

 small basal cylinder. Basal appendages remote, bearing four or five stout ter- 

 minal setae. 



Larva, Stage IV (see figure of the entire larva, plate 71). Head rounded, 

 narrowing slightly before eyes, a slight notch at insertion of antennae, front mar- 

 gin broadly arcuate. Antennas moderate, slightly swollen at base, spined all over 

 with large and small spines, the small spines in rows ; tuft moderate, before the 

 middle ; four short terminal spines of different lengths, one long one, and a short 

 rounded process. Eyes large, transverse, pointed. Upper pair of dorsal head- 

 tuft with three hairs, lower pair with two hairs, ante-antennal tufts multiple. 

 Mental plate broadly triangular, apical half less steeply angled ; a central tooth 

 and seventeen on each side, the basal five much larger and widely spaced. Man- 

 dible quadrangular, a few spines outwardly ; two long filaments toward tip in 

 front of a thorn-shaped notch ; a row of cilia outwardly from a collar ; fifteen 

 filaments on outer margin, the basal three fringed ; dentition of four teeth on a 

 process, nearly equal ; three filamentous processes before, a tooth at base with a 

 short furcation, a broad filament and five fringed ones within; process cleft- 

 furcate, with tufts of hair and a row of five sparsely placed hairs; angle below 

 rounded ; four filamentous hairs within ; a row of long hairs at base. Maxilla 

 conical, divided by a suture ; inner half with a slight notch above, densely hairy 



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