AEDES TRICHURUS 761 



sides; first segment with a large patch of white scales and with many fine pale 

 hairs ; venter largely whitish scaled, with small, black, segmental medio-apical 

 spots. Cerci black. 



Wings rather broad, hyaline ; petiole of second marginal cell shorter than its 

 cell, that of second posterior cell slightly longer than its cell ; basal cross-vein 

 distant less than its own length from anterior cross- vein; scales blackish-brown, 

 the outstanding ones broadly linear. Halteres whitish, with yellowish knobs. 



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

 black above, a black ring before tip; tibise largely dirty white scaled below, 

 bronzy-black above with a few white scales intermixed, tips black ; tarsi bronzy- 

 black, the basal joint beneath with scattered white scales becoming fewer out- 

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



Length: Body about 5.5 mm.; wing 5 mm. 



Male. Proboscis slender, rather long, straight, black scaled. Palpi exceeding 

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

 joints somewhat swollen ; vestiture black ; hairs on end of long joint and the last 

 two joints dense, long, brown with ochreous reflections in certain lights. An- 

 tenna plumose, the last two joints long and slender, pilose, blackish, the others 

 shorter, pale, with black rings at insertions of hair-whorls ; hairs of whorls long, 

 dense, brownish black with silky luster. Coloration similar to the female. Ab- 

 domen elongate, depressed, broadest on sixth and seventh segments, narrowest at 

 third ; white basal segmental bands broader than in female ; lateral ciliation long, 

 abundant, pale yellowish brown. Wings narrower than in the female, stems of 

 the fork-cells longer, vestiture less abundant. Claw formula, 2.1-2.1-1.1. 



Length : Body about 6 mm. ; wing 5 mm. 



Genitalia (plate 24, fig. 166) : Side-pieces more than twice as long as wide; 

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

 to basal lobe, which is conically prominent and bears numerous long setse and a 

 central stout spine. Clasp-filament slender, slightly expanded in the middle, 

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

 spine. Harpagones with a very long columnar stem, the stem itself nearly long 

 enough to reach to tip of side-piece, uniform, setose towards base, and a short, 

 fusiform, terminal filament, which bears a series of parallel, transverse, strongly, 

 elevated narrow ridges, angularly expanded beyond the middle. Harpes ellipti- 

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

 curved outward. Unci approximate, revolute, forming a large basal cylinder. 

 Basal appendages approximate, bearing four or five stout terminal setfe. 



Larva, Stage lY (plate 119, fig. 410). Head rounded, narrowed before eyes, 

 a slight notch at insertion of antennas, front margin broadly arcuate. Antennae 

 subcylindrical, slightly tapered, one side with many stout oblique spines; tuft 

 moderate, a little before middle ; three terminal spines and a long one and a short 

 digit. Upper pair of dorsal head-hairs double or triple, lower single, ante-anten- 

 nal tuft multiple. Mental plate triangular, an apical tooth and fourteen on each 

 side, becoming larger and more remote basally, the last one small. Eyes large, 

 transverse, pointed. Mandible quadrangular, a few spines at base; four outer 

 filaments, two long and two short ; a row of cilia from a collar ; sixteen filaments 

 on outer edge, the two nearest the collar smaller and feathered ; dentition of four 

 teeth on a process, the first longest ; a spine before, a tooth at base, three below, a 

 broad serrate filament and five slender ones within ; process below furcate, with 

 tufts of hair ; basal angle slight ; two filamentous hairs within, four below and a 

 dense row near base. Maxilla shortly hemispherical, divided by a band-shaped 

 suture ; inner half densely haired, a crown of hairs at vertex ; outer half with a 

 few short spines near the palpus, two filaments next the suture and a spine on the 

 other side ; palpus stout, with four apical digits convergently appressed. Thorax 

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