650 MOSQUITOES OF NOKTH AMERICA 



Bmall black setse on inner side ; hairs of whorls sparse, moderate, black. Clypeus 

 shortly conical, prominent, nude. Occiput brown, clothed broadly with narrow, 

 curved, pale yellowish scales on the vertex, broad flat white ones on the sides, 

 some brownish ones intermixed subdorsally, many erect, very narrow forked 

 scales dorsally, some black, some pale ; setse along margins of eyes coarse, black. 



Prothoracic lobes elliptical, remote dorsally, clothed with scales like those on 

 vertex of head and numerous pale bristles. Mesonotum ferruginous brown, dor- 

 sal lines slightly paler ; vestiture of small, narrow curved scales, golden brown 

 dorsally, pale golden along anterior and lateral margins and around antescu- 

 tellar space ; a narrow golden line each side on posterior half outside of ante- 

 scutellar space; bristles moderate, black, numerous above roots of wings. 

 Scutellum trilobate, brown, clothed with pale golden scales, each lobe with a 

 group of about ten long brownish bristles. Postnotum elliptical, prominent, 

 brownish luteous, nude. Pleurae and coxae luteous, clothed with flat white scales 

 and short pale bristles. 



Abdomen subcylindrical, flattened, posterior segments tapering ; dorsal vesti- 

 ture of black scales with a slight greenish or coppery reflection, a narrow band 

 of white scales at base of each segment widening laterally, medianly interrupted 

 on sixth and seventh segments ; first segment with a patch of black scales in the 

 middle, a few white ones on each side, and with many fine pale hairs ; venter 

 entirely whitish scaled except for triangular black patches on posterior lateral 

 margins ; cerci black ; setae fine, moderately abundant. 



Wings rather broad, hyaline with an iridescent luster; petiole of second mar- 

 ginal cell about two-thirds as long as its cell, that of second posterior cell about 

 as long as its cell ; posterior cross-vein about its own length distant from anterior 

 cross- vein; vestiture of veins entirely black, the outstanding scales on apical 

 portion of wing dense, narrowly ligulate. Halteres whitish, with a slightly 

 darker knob. 



Legs moderately long and slender ; femora largely pale beneath, a few black 

 scales above which become numerous at apex, tips white; tibiae pale on sides, 

 clothed with black scales along outer edge ; tarsi black, each joint of hind tarsi 

 with a broad basal and apical white ring, the last joint wholly white ; bands on 

 mid tarsi much reduced, on fore tarsi present only on first and base of second 

 joint, the last three joints entirely black. Claw formula, 1.1-1.1-1.1. 



Length : Body about 4.5 mm. ; wing 4 mm. 



Male. — ^Proboscis straight. Palpi exceeding the proboscis by half the length 

 of last joint, last two joints slightly enlarged ; vestiture brownish black, a broad 

 white ring at middle of long joint and a small one at bases of last two joints; 

 end of long joint and last two joints with numerous long dull brown hairs. 

 Antennae plumose, the last two joints long and setose, the others short, the 

 thickened rings at insertions of hair-whorls black, the rest pale ; hairs of whorls 

 long, dense, brown. Coloration similar to the female. Wings narrower than in 

 the female, the stems of the fork-cells longer, both considerably longer than their 

 cells, the vestiture sparse. Abdomen elongate, depressed, the basal white bands 

 very broad and laterally expanded ; lateral ciliation long, dense, pale yellowish. 

 Claw formula, 2.1-2.1-1.1. 



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



Genitalia (plate 28, fig. 193) : Side-pieces two and one-half times longer than 

 broad, apical and basal lobes similar, quadrate, prominent, flattened, with dense 

 short setae. Clasp-filament long and slender, slightly swollen medianly, with a 

 long articulated terminal spine. Harpes flat, concave, inner margin revolute, 

 tip bent sideways, with a short spine. Harpagones with a slender columnar stem 

 bearing a small seta before the tip and a slender linear filament at the apex which 

 is nearly as long as the stem. Unci membranous, obscure, forming a small 



