AEDES BUSCKn 861 



Postnotum elliptical, prominent, luteous, nude. Pleurae and coxae yellowish, 

 with small patches of silvery-white scales and with some black bristles. 



Abdomen subcylindrical, tapered at the tip, sixth and seventh segments 

 apically expanded beneath; dorsal vestiture of dull blue-black scales, a row of 

 very large, silvery-white spots medianly on lateral margins of segments, show- 

 ing in a dorsal view on sixth and seventh segments ; first segment black scaled 

 and with fine pale hairs; venter yellowish-white scaled, apical halves of fifth, 

 sixth and seventh segments black, eighth segment all black-scaled ; setae abund- 

 ant, especially ventrally. 



Wings rather narrow, smoky-hyaline; petiole of second marginal cell about 

 half as long as its cell, that of second posterior cell somewhat shorter than its 

 cell; basal cross- vein distant about twice its own length from anterior cross- 

 vein; scales brown, those on costa black with blue reflection, the outstanding 

 ones narrowly ligulate, dense and broader on fork of second vein. Halteres 

 ochraceous, knobs blackish at bases. 



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

 white at bases and beneath narrowly to tips ; front and middle knees narrowly 

 silvery, hind ones broadly so; tibiae entirely blue-black, front tibiae with a 

 silvery-white spot dorsally at their apices ; hind tarsi with broad white bands at 

 bases of first three joints, the band on the third occupying two-thirds of the 

 joint; middle tarsi with small white bands on bases of first two joints; fore tarsi 

 without white bands. Claw formula, 0.0-0.0-0.0. 



Length : Body about 3.5 mm. ; wing 3 mm. 



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

 very nearly as long as the proboscis, slender, straight, terminal joints not 

 thickened; vestiture blue-black, a small whitish ring before middle of long 

 joint; last two joints with a few small short setse. Antennse plimiose, the last 

 two joints long, slender, rugose, pilose black, the others short, whitish, with a 

 black ring at insertions of hair-whorls; hairs long, not very dense, black. 

 Coloration similar to the female. Abdomen elongate, subcylindrical, slightly 

 expanded towards apex ; eighth segment with a broad, basal, median silver spot; 

 claspers vrith silver scales basally; no distinct lateral ciMation. Wings nearly 

 as broad as in the female; stems of the fork-cells a little longer, the vestiture 

 less abundant. Claw formula, 1.0-1.0-0.0. 



Length : Body about 4 mm. ; wing 3 mm. 



Genitalia (plate 33, fig. 330) : Side-pieces twice as long as wide, conically 

 tapered; apical lobe absent, basal lobes semi-detached, conical, bearing a stout 

 articulated terminal spine. Clasp-filament slender, a little thickened at base, 

 with a rather short articulated termiual spine. Harpes concave, the inner mar- 

 gin thickened, strongly revolute, the tip bent outward, emarginate. Harpagones 

 absent. Unci contiguous, revolute, forming a stout basal cylinder. Basal 

 lobes small, approximate, each with four .stout setae. 



Larva, Stage IV (plate 133, fig. 434) . — Head rounded, narrowed before eyes, 

 a slight notch at insertion of antennae, front margin arcuate. Antennae small, 

 cylindrical, uniform, with a few sparsely distributed spines ; a two-haired tuft 

 near middle; three short spines, a long and a stout digit at apex. Upper pair 

 of dorsal head-hairs single, lower pair double ; ante-antennal tufts of four hairs. 

 Mental plate triangular, a single apical tooth and fourteen on each side, small, 

 the apical ones closely placed, the basal ones sharper and more remote. Man- 

 dible quadrangular; two filaments before apex; an outer row of cilia from a 

 collar; ten filaments on outer margin, the three next the collar shorter; denti- 

 tion of four teeth on a process, the first longest; a spine before, a broad filament 

 and five feathered hairs within ; process below deeply furcate, the upper limb 



