486 MOSQUITOES OF NORTH AMERICA 



median dark line, nude. Pleura and coxae brownish, with patches of yellow- 

 white scales and rows of brown bristles. 



Abdomen subcylindrical, depressed, truncate at tip, black scaled above, a 

 yellowish-white band at base of each segment; first segment yellowish-white 

 scaled and with many pale hairs ; eighth segment entirely light scaled ; the bands 

 occupy one-third to one-fourth of segment and are slightly produced in the 

 middle; the bands on the sixth and seventh segments are broadened on the sides; 

 venter entirely pale scaled ; abdominal hairs with yellowish luster. 



Wings broad, hyaline, with diffused brownish spots at bases of second and 

 third veins and on the cross-veins; second marginal cell more than twice the 

 length of its stem, second posterior cell shorter than its stem, cross-veins nearly 

 incident; veins entirely dark-brown scaled, the scales of two forms, the 

 appressed ones elongate, subtruncate at tip, the outstanding ones linear, long, 

 and curved ; the scaling is denser on certain veins, sometimes due to the greater 

 number of outstanding scales, sometimes to the greater development of ap- 

 pressed scales ; at the base of the third vein the scales form a well marked, but 

 slight black spot, base of second vein and bases of the forks of second and fourth 

 veins also more heavily scaled. Halteres with brownish stems and darker knobs. 



Legs long and slender ; vestiture blackish, femora pale scaled beneath to near 

 apices ; a narrow pale line on under side of tibiae ; knees yellowish white scaled ; 

 tips of tibiae yellowish white scaled, those of fore and middle pairs very broadly, 

 of hind pair more narrowly so ; tarsi entirely black. Claw formula, 0.0-0.0-0.0. 



Length : Body about -i.S to 6.5 mm.; wing 5 to 7 mm. 



Male. Proboscis straight, slender. Palpi slender, about as long as the 

 proboscis, end of long joint and penultimate one slightly thickened, the last 

 joint forming a stout club, all with long black hairs ; vestiture of brown scales. 

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

 black, the others short, slender, whitish, with black rings at insertions of hair- 

 whorls. Coloration similar to the female. Occiput with the erect forked scales 

 on vertex pale yellow, those on the sides black. Wings narrow, the stems of the 

 fork-cells longer than in the female, basal cross-vein farther removed from 

 anterior one, vestiture less abundant. Abdomen elongate, depressed, somewhat 

 expanded posteriorly, with dense pale brown lateral ciliation ; venter with dark 

 apical bands, narrowly interrupted along median line. Tarsal claw formula, 

 2.1-2.1-0.0. 



Length : Body about 5 to 6 mm. ; wing 5 to 6 mm. 



Genitalia (plate 35, fig. 231) : Side-piece very stout, rounded at apex; basal 

 lobe expanded rounded, setaceous with a single central coarse seta on a pedicel ; 

 outer lobe undeveloped, its area more densely setaceous. Terminal filament en- 

 larged at base, gradually tapering to apex, which bears a stout, short, articulated 

 spine. Harpe elongate, slender with apex slightly expanded and divided into 

 six subequal teeth on posterior margin. Hari^ago long, thick, cylindrical, with 

 truncate open tip, appearing like a curved tube, about as long as harpe, smooth. 

 Unci broad at base, narrowing posteriorly to oblique rounded extremities. Seta- 

 ceous lobes slightly produced, separate, each bearing six to nine stout setae. 

 Posterior margin of preceding segment heavily chitinized, with a long median 

 band of dense, stout, short spines, about 26 in number. 



Larva, Stage IV. Head rounded, narrowed before eyes, a notch at insertion 

 of antennae, the front margin arcuate. Antennae small, subcylindrical, sparsely 

 spined, a long tuft a little before the middle ; two long and two shorter apical 

 setae and a long digit on a pedicel. Eyes large, pointed. Both pairs of dorsal 

 head-tufts and ante-antennal tufts multiple. Mental plate elongate-triangular, 

 with a central tooth and thirteen on each side, basal ones longer and more re- 

 mote, last one small. Mandible quadrangular, elongate, part beyond collar 



