CULEX MUTATOR 423 



Legs rather long, slender; vestiture bronzy brown; femora with a blue reflec- 

 tion, whitish beneath nearly to apices. Claw formula, 0.0-0.0-0.0. 



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



Male. — Proboscis long and slender, straight, gradually enlarged towards apex, 

 black scaled with a bronzy luster. Palpi exceeding the proboscis by more than 

 the length of the last joint; last two joints slender, and with tip of long joint 

 moderately hairy; vestiture bronzy black. Antennae plumose; last two joints 

 long and slender, rugose, pilose, black, the others short, whitish, ringed with 

 black at insertions of hair-whorls ; hairs dense, long, black. Coloration similar 

 to the female. Wings narrower than in the female, the stems of the fork-cell 

 longer, vestiture sparser. Abdomen elongate, subcylindrieal, slender; dorsal 

 white bands broader; ciliation coarse, brown, not forming a distinct lateral 

 fringe. Claw formula, 1.0-1.0-0.0. 



Length : Body about 3 mm. ; wing 3.3 mm. 



Genitalia (plate 10, fig. 68) : Side-pieces over twice as long as wide, tips 

 conically tapered, three prominences on inner margin, the distal one stout, long, 

 bearing a filament with hooked tip, a large leaf-like appendage and three 

 short filaments, proximal two joined at base, each branch bearing a long 

 filament with expanded tip and recurved apical point. Clasp-filament expanded 

 outwardly, outer margin obliquely cut and serrate, inner half partly divided off 

 and bearing an articulated terminal claw. Harpes and harpagones divided, 

 inner branch of harpes long and slender and terminating in a narrow cluster of 

 teeth. Basal appendages remote, oblique, and setose. 



Larva, Stage IV (plate 108, fig. 361). — Head rounded, widest through eyes, 

 bulging on the sides, a large notch at insertion of antennae, front margin 

 arcuate. Antennas large, curved, basal two-thirds thick and well spined, with a 

 large tuft from a notch ; two long subapical setas, a long seta, a short one and a 

 digit at tip. Upper pair of dorsal head-hairs double, lower pair single; ante- 

 antennal tufts multiple. Mental plate small, triangular, with a large central 

 tooth, five large teeth on each side and a small basal tooth. Mandible quad- 

 rangular; three filaments and a tuft of hairs before tip; an outer row of cilia 

 from a collar; a row of rounded transverse prominences on outer margin, each 

 bearing a fine, rather long hair and tuft of short ones; dentition of four irregu- 

 lar teeth and stout spines below; a small spine, a long filament and row of 

 feathered hairs within ; process below obscurely furcate, with a longitudinal and 

 a transverse row of hairs and a tuft at tip of each limb ; basal angle small ; a row 

 of hairs within in line with basal hairs and approximated to them. Maxilla 

 elongate, conical at tip, divided by a suture; inner half with a row of long spines 

 on margin, basal ones feathered ; a patch of coarse hairs within, occupying basal 

 portion ; a row of long hairs at tip running down along the suture ; outer half 

 with a pair of filaments below middle and some fine hairs near base. Palpus 

 very small, with four long, slender digits. Body pilose. Air-tube long, 

 gradually tapering, over five times as long as wide ; pecten of long teeth, reach- 

 ing about to basal third, single teeth serrate along one side; six long approxi- 

 mated hair-tufts on posterior margin beyond pecten, progressively decreasing 

 in length towards tip ; terminal hooks large, slender, simple. Lateral comb of 

 eighth segment of coarse spines in a rather small patch about two rows deep; 

 single spine elongate, widened at tip, with an apical fringe of spinules. Anal 

 segment longer than wide, riuged by the plate ; dorsal tuft of two long hairs and 

 a short one on each side; ventral brush well developed, confined to the barred 

 area. Anal gills shorter than the segment, gradually tapered. 



The larvae live in ground puddles. Mr. Knab obtained them in rock-pools of 

 a stream-bed in a ravine. The larvae are dark colored and usually lie upon the 

 bottom back downwards, the head bent toward the breast. On his second visit 



