AEDES MEDIOVITTATA 823 



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

 about as long as the proboscis, slender, the terminal joints long, not enlarged 

 and with only a few scattered black bristles ; vestiture black, a broad white ring 

 at base, a narrower one just beyond middle of long joint, a narrow white ring 

 at bases of the last two joints. Antennae plumose, the last two joints long and 

 slender, rugose, pilose, black, the others short, whitish, narrowly ringed with 

 deep black at insertions of hair-whorls; hairs of whorls long, dense, brown. 

 Coloration similar to the female. Abdomen elongate, depressed, sixth and 

 seventh segments laterally broadened ; segments with narrow, dirty-white basal 

 bands above, silvery lateral spots visible in dorsal view on fifth, sixth and seventh 

 segments ; last segment with a large median patch of silver scales ; lateral cilia- 

 tion short, coarse, irregular, brown ; claspers with a patch of silver scales at their 

 bases. Wings narrower than in the female, stems of the fork-cells longer, 

 the vestiture less abundant. Claw formula, 1.1-1.1-0.0. 



Length : Body about 4 mm. ; wing 3.5 mm. 



Genitalia (plate 30, fig. 206) : Side-pieces over twice as long as wide, tip 

 conically tapered, apical lobe absent, basal lobe a small swelling bearing fine 

 setiB with tubercular bases, a long spine at extreme base of side-piece. Clasp- 

 filament short, slightly swollen on apical two-thirds, with a long articulated 

 terminal spine, over half as long as filament. Harpes elliptical, concave, inner 

 margin thickened, revolute, tip bent over, tridentate. Harpagones with a long 

 slender columnar base, curved, pilose, bearing a small seta at middle and an 

 articulated triangularly spatulate terminal filament. Unci contiguous, revo- 

 lute, forming a basal cone. Basal appendages small, bearing four terminal 

 spines. 



Larva, Stage IV (plate 124, fig. 432). Head rounded, hardly narrowing 

 before eyes, a slight notch at insertion of antennae, front margin broadly arcuate. 

 Antennae cylindrical, slender, smooth, a single small hair beyond the middle; 

 a long spine at tip, two short ones, a spine and a digit on a pedicel. Eyes small, 

 rounded. Both pairs of dorsal head-hairs single, the anterior pair approximated 

 and near anterior margin ; ante-antennal tuft of two hairs. Mental plate shortly 

 triangular, a stout central tooth and ten on each side, the apical ones rounded 

 and closely set, the basal ones sharp and remote ; base of plate roundedly incised, 

 almost toothed. Mandible quadrangular, with sharp spines at base; two fila- 

 ments before tip ; a row of cilia from a collar ; outer margin oblique, with a row 

 of filaments near the cilia ; dentition of four teeth on a process, the first tooth 

 long; a spine before, a serrate filament and four narrow ones within, a cleft 

 tooth at base; process below broadly trifid, the upper lobe angled, middle one 

 rounded, lower slender, each with a hair-tuft at tip, a row of hairs along the 

 middle ; basal angle obsolete ; a row of hairs within and another at base. Maxilla 

 elongate, somewhat truncate, divided by a band-shaped suture; inner half 

 with a chitinized basal area from which arise four long spines and a row of 

 shorter ones, two lines of cilia, the marginal one with spinules intermixed, a tuft 

 of hairs at tip ; outer half with a long spine next the hair-tuft, the two articu- 

 lated digits situated subapically, a few hairs within; palpus nearly as long as 

 the maxilla, slender, with four apical digits, of which one is long. Thorax 

 rounded, wider than long; hairs abundant, rather long, subdorsal prothoracic 

 tufts multiple ; small tufts on disk of thorax stellate. Abdomen moderate, 

 anterior segments shorter ; lateral hairs rather long, multiple on first segment, 

 double on second to sixth ; secondar}^ hairs in coarse stellate tufts ; tracheal 

 tubes rather narrow, band-shaped. Air-tube stout, slightly tapered on outer 

 half, two and a half times as long as wide; pecteii reaching nearly to middle, 

 of very long teeth closely set and running in a spiral one-third of the way around 

 the tube ; single pecten-tooth simple ; a single hair beyond pecten. Lateral 



