1030 :mosquitoes of north ameeica 



Dbscbiption or Female, Male, Labva and Egg of Anopheles qtjadbimaculatus : 



Female. — Proboscis long, straight, slender; labellse long, lanceolate, dull, 

 luteous, with small outstanding black setae; vestiture appressed, dark brown. 

 Palpi as long as proboscis, uniform, slender; vestiture of dark iDrown narrow 

 scales, roughened at base, a few stiff setae at tip. Antennae filiform, the joints 

 subequal, rugose, blackish, pilose; hairs of whorls sparse, black, short; tori 

 subspherical, with a cup-shaped apical excavation, small, blackish. Clypeus 

 elongate elliptical, dark brown, nude. Eyes well separated, black. Occiput with 

 a median groove, blackish, densely clothed with erect, triangular, or notched 

 scales, black on the sides and at extreme base, whitish anteriorly, a tuft of long 

 white hair-scales projecting forward between the eyes ; a row of black setae along 

 margins of eyes. 



Prothoracic lobes lateral, small, elliptical. Mesonotum narrow, depressed, 

 brown, three darker longitudinal stripes on the disk, grayish pruinose on pos- 

 terior third, sides behind middle dark brown; vestiture of coarse pale yellow- 

 ish hair-scales, densest over the three dark stripes, some stiff bristles over 

 roots of wings. Seutellum collar-like, dark brown, with a marginal row of pale 

 brown bristles. Postnotum elliptical, prominent brown, nude. Pleurae and 

 coxae brownish luteous, with a few short hairs. 



Abdomen subeylindrical, somewhat depressed, truncate at tip, luteous brown, 

 the apices of the segments broadly blackish ; vestiture of numerous pale bristles 

 arising from small black punctures. 



Wings (plate 41, fig. 23) moderate, hyaline; petiole of second marginal cell 

 shorter than its cell, that of second posterior ceU about as long as its cell; basal 

 cross-vein distant about its own length from anterior cross-vein ; scales of veins 

 lanceolate, narrow, of different lengths on different areas, the long ones black, 

 the short ones brown, the black scales denser and forming spots at the bases of the 

 second marginal and second posterior cells, at the cross-veins and origin of 

 second vein. Halter es with pale stem and black knob. 



Legs long and slender ; vestiture brownish-black, tips of femora and tibite 

 narrowly yellowish white. Claw formula, 0.0-0.0-0.0. 



Length : Body about 5 mm. ; wing 5 mm. 



Male. — Palpi as long as the proboscis, the last two joints swollen and club- 

 shaped, with many long brown hairs with yellow silky luster ; vestiture bronzy 

 black. Antennae plumose ; last two joints long and slender, rugose, pilose, black, 

 the others short, pale, with narrow black basal rings ; hairs of whorls long, dense, 

 brownish with yellow silky luster. Coloration as in the female. Abdomen long, 

 depressed, somewhat broadened distally, black, the margins of the segments 

 narrowly luteous, hairs of dorsum yellowish ; lateral ciliation coarse and irregu- 

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

 vestiture more sparse. Claw formula, 3-0.0-0.0. 



Length : Body about 5.5 mm. ; wing 4.5 mm. 



Genitalia (plate 39, fig. 263) : Side-pieces longer than wide, conical, a stout 

 seta at middle, at base two spines from a common base, an inner setose lobe bear- 

 ing four unequal spines in two groups, the outer pair with rounded tips. Clasp- 

 filament as long as side-piece, slender, slightly enlarged at base and apex, with a 

 short and stout articulated terminal spine. Unci slender, columnar, with two 

 tufts of spines at tip, bent outward at right angles. Basal appendages large, 

 delicate, leaf-like. 



Larva, Stage IV. — Head rounded, longer than wide, bulging at the sides, 

 frontal portion before insertion of antennae conically produced; dorsal head- 

 hairs single but numerously branched, in a line between antennae, a smaller hair 

 at base of antennae; two long approximate setae on front margin. Antennae 

 subeylindrical, slightly tapered, spined on one side ; a tuft of four hairs at basal 

 two-fifths; two long dentate articulated terminal processes, one short one and 

 a small hair-tuft. Byes large, pointed. Mental plate small, with a median^ 

 tooth and four on each side, perpendicular, the first and second lateral ones* 



