AEDES PERTINAX 793 



sides, pale yellow in a broad median stripe, and along eye-margins, a large brown- 

 ish-black patch on the sides, many erect forked black scales on the nape ; bristles 

 along the margins of eyes dark brown, those projecting between eyes whitish. 



Prothoracic lobes elliptical, remote dorsally, dark brown, concolorous with 

 sides of mesonotum, with some dark scales and dark setae. Mesonotum dark 

 brown, covered with narrow curved scales, a narrow, straight, pale yellowish 

 silvery median line from anterior edge of mesonotum to antescutellar space and 

 widening slightly posteriorly, the rest of the vestiture dark brown, slightly 

 lighter colored on posterior half, a few whitish scales and hairs about ante- 

 scutellar space ; bristles dark. Scutellum trilobate, with narrow, curved brown 

 scales, a few pale yellow scales on mid lobe, each lobe with a group of dark brown 

 bristles. Postnotum elliptical, prominent, brownish luteous, nude. Pleurae 

 brown, coxae yellowish, clothed with patches of elliptical, flat white scales and 

 pale bristles. 



Abdomen subcylindrical, flattened, posterior segments tapering; dorsal vesti- 

 ture of dull blue-black scales, bristles on posterior borders of segments yellowish, 

 a row of segmental, lateral, basal, triangular, white spots; first segment with 

 black scales and many fine pale hairs ; venter yellowish-white scaled, with black 

 scales tending to form apical black bands on the segments. Cerci black. 



Wings moderate, hyaline ; petiole of second marginal cell about half as long as 

 its cell ; that of second posterior cell shorter than its cell ; basal cross-vein about 

 its own length distant from anterior cross-vein; scales blackish brown, with a 

 blue reflection along costa, the outstanding ones narrowly ligulate, denser on 

 forks of second vein. Halteres pale, with blackish knobs. 



Legs slender, moderately long; vestiture dark bronzy-brown and bluish-black, 

 under side of femora yellowish-white except at tip ; mid and hind tibiae and hind 

 first tarsal joint with a fine line of yellowish-white scales on under side. Claw 

 formula, 1.1-1.1-1.1. 



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



Male. Proboscis longer and more slender than in the female, straight, bronzy- 

 black scaled. Palpi exceeding the proboscis by the length of the last joint; 

 apical part of long joint and last two joints considerably swollen and with dense, 

 long black hairs ; vestiture deep bronzy-brown throughout. Antennae plumose, 

 the last two joints slender, rugose, pilose, black, the others short, pale, nar- 

 rowly black ringed at insertions of hair-whorls ; hairs long, dense, black ; tori 

 entirely blackish. Coloration similar to the female. Abdomen elongate, de- 

 pressed, the lateral spots tending to form white basal segmental bands ; lateral 

 ciliation abundant, long, coarse and pale. Wings narrower than in the female, 

 the stalks of the fork-cells longer, the vestiture less abundant. Claw formula, 

 2.1-2.1-1.1. 



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



Genitalia (plate 24, fig. 169) : Side-pieces three times as long as wide; apical 

 lobe slender, prominent, conical ; basal lobe rounded conical, setose, with a stout 

 spine within. Clasp-filament slender, slightly expanded in middle, with a long 

 terminal articulated spine. Harpes narrowly elliptical, concave, inner margin 

 thickened, revolute, tip pointed, outcurved. Harpagones with a slender, 

 columnar stem and a terminal filament, which is roundedly expanded at base, 

 tip tapered and shortly bent over. Unci approximate, revolute, forming a small 

 basal cylinder. Basal appendages approximate, short, bearing five short spines. 



Larva, Stage IV (plate 124, fig. 429). Head rounded, widest through eyes. 

 Antennae moderate, slender, uniform, with a small hair-tuft near the middle. 

 Both pairs of dorsal head-hairs single, ante-antennal tuft multiple. Body 

 glabrous. Lateral comb of eighth abdominal segment of about ten to twelve 

 scales in a single irregular row, each scale with a long central spine, the sides 

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