CULEX SIMILIS 341 



dark coarse setae. Seutellum trilobate, brownish, luteous, clothed with hair-like 

 pale reddish-brown scales, each lobe with a group of black bristles. Postnotum 

 elliptical, prominent, whitish luteous, nude. Pleurae and coxae greenish luteous 

 with rows of broTwi bristles. 



Abdomen subcylindrical, depressed, truncated at tip; dorsal vestiture dark 

 brown with a bluish reflection, a series of basal narrow bands on all the segments 

 but the first, that of second segment mesially produced, those on sixth and 

 seventh segment broadly expanded at sides; venter yellowish- white scaled, a 

 black band at tip of each segment ; hairs at tips of segments rather long and 

 pale. 



Wings rather broad, hyaline ; petiole of second marginal ceU about one-fourth 

 as long as its cell, that of second posterior cell shorter than its cell ; basal cross- 

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

 luster on costa, outstanding ones moderate, linear, denser on fork of second vein. 

 Halteres whitish with darker knobs. 



Legs moderate, slender; femora white at base and beneath nearly to tips; tips 

 of posterior tibiae white; vestiture otherwise black with blue reflection above and 

 brassy beneath ; knees narrowly whitish. Claw formula, 0.0-0.0-0.0. 



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



Male. — Proboscis straight, gradually enlarged towards apex, bronzy black 

 with a paler shade beneath at middle. Palpi exceeding the proboscis by nearly 

 the length of the last two joints, which with the end of the long joint are 

 thickened and bear many black hairs ; vestiture bronzy black, bases of last two 

 joints white scaled beneath. Antennae plumose ; last two joints long and slender, 

 rugose, pilose, black, the others short, white, ringed with black at insertions of 

 hairs-whorls; hairs long, black. Coloration similar to the female. Wings 

 narrower than in the female, the stems of the fork-cells longer ; vestiture a little 

 sparser. Abdomen elongate, depressed; basal pale bands broad, greatly ex- 

 panded laterally on sixth and seventh segments; lateral ciliation long and 

 abundant, pale yellowish. Claw formula, 1.1-1.1-0.0. 



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



Genitalia (plate 19, figs. 135 and 136) : Side-pieces over twice as long as wide, 

 tips conically rounded; lateral process quadrate bearing a leaf -like appendage 

 and rods with pointed tips; clasp-filament moderate, slightly enlarged basally 

 with small terminal claw. Harpes divided, inner limb rounded, stout, cro^vned 

 with dense spines, outer limb curved, blade-like. Harpagones divided into a 

 number of plates with angular corners, one projecting as far as tips of harpes, 

 expanded and coarsely toothed. Basal appendages large, rounded, setose. 



Larva, Stage IV (plate 101, fig. 335). — Head rounded, widest through eyes, 

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

 Antennae large, curved, thick and well spined on basal two-thirds with a large 

 hair-tuft from a notch; two long setae shortly subapieal, a long seta, a short 

 one and a digit at tip. Mental plate triangular, not as thick as usual, with a 

 stout central tooth and eight on each side, basal ones more sparsely placed, a 

 very small ninth tooth on side. Both pairs of dorsal head-hairs in threes, ante- 

 antennal tuft multiple. Mandible quadrangular ; three filaments and a tuft of 

 hair before tip ; an outer row of cilia from a collar ; a row of rounded transverse 

 prominences on outer margin, each bearing a long hair and tuft of short ones ; 

 dentition of four teeth on a process, first longest ; a spine before, a small tooth 

 at base, a long filament and row of feathered hairs within; process below ob- 

 scurely furcate with a longitudinal and transverse row of hairs and a tuft at 

 tip of each limb ; basal angle very slight with a row of long hairs within ; a basal 

 row of hairs. Maxilla elongate, conical at tip, divided by a suture; inner half 

 with a row of long spines along margin, basal ones feathered, two rows of cilia 



