MOSQUITO BIOLOGY 137 



panded laterally than in the female, last segment entirely white-scaled. 

 Claw formula, 1.1—1.1—1.1. 



"Length : Body about 5 mm. ; wing 4 ram. 



"Genitalia : Side-pieces more than twice as long as wide ; apical lobe 

 well developed, prominent, continued narrowly along side-piece to basal 

 lobe, which is slightly squarely prominent and bears numerous setae 

 with tubercular bases and a stout hooked spine with an attendant 

 group of small spines. Clasp-filament slender, moderate, slightly ex- 

 panded in middle, notched towards apex, and bearing a few fine setae, 

 a long articulated terminal spine. Harpagones with a moderate, slen- 

 der, columnar base bearing a rather short, articulated, medianly 

 widened, terminal filament. Harpes elliptical, concave, curved, inner 

 margin thickened and revolute, tip pointed and curved outward. Unci 

 approximate, revolute, forming a small basal cylinder. Basal append- 

 ages approximate, bearing four or five stout terminal setae. 



^'Larva, Stage IV. Head rounded, narrowed before ej^es, slight notch 

 at insertion of antennae, front margin arcuate. Antennae cylindrical, 

 curved, spined all over ; tuft moderate, before middle ; four terminal 

 spines of various lengths, two shortly subapical, a short thick digit. 

 Eyes transverse, pointed. Dorsal head-hairs single, ante-antennal tufts 

 in threes or fours. Mental plate shortly triangular ; apical tooth broad, 

 roundedly incised as if formed of three fused teeth, eleven side-teeth be- 

 come larger basally, the last one small and remote. Mandible quad- 

 rangular, with small spines near base ; two filaments before tip ; an 

 outer row of cilia form a collar ; eleven filaments on outer edge ; denti- 

 tion of four teeth on a process, the first longest ; a filament and two 

 unequal teeth before; a broad filament and six feathered ones within, 

 unusually large ; process below furcate, with patches of hair ; a pointed 

 basal angle, with four long hairs within ; a long row of hairs at base. 

 Maxilla elongate hemispherical, divided by an oblique suture ; inner half 

 with rows of hairs, a large tuft at vertex ; outer half with a band of 

 hair, two filaments next the suture toward apex and a spine on the 

 other side; palpus short, with four small digits and a central eleva- 

 tion. Thorax wider than long; hairs moderate. Abdomen rather stout, 

 the anterior segments shorter ; lateral hairs single on segments three to 

 six ; tracheal tubes broad, band-shaped. Air-tube stout, about three 

 times as long as wide ; pecten usually evenly spaced, occasionally with 

 some of the terminal teeth somewhat detached, reaching less than half 

 the length of tube, followed by a single tuft of two or three hairs ; 

 single spine long, slightly widened at base, with two small branches 



