734 MOSQUITOES OF NOETH AMERICA 



flat yellowish-white ones at the sides, many short, erect, forked yellowish scales 

 on the nape ; setae along margins of eyes black, those projecting forward at the 

 vertex pale. 



Prothoracic lobes elliptical, remote dorsally, black, clothed with broad, curved, 

 whitish-yellow scales and black bristles. Mesonotum black, clothed with narrow, 

 curved, light brownish-yellow scales and medianly with two narrow, approxi- 

 mated, longitudinal stripes, the scales on these smaller and dark brown, in the 

 middle pale stripe a bare line, a short brown stripe on either side of antescutellar 

 space, scales surrounding antescutellar space lighter; bristles numerous, mod- 

 erate, black. Scutellum trilobate, black, clothed with pale yellow scales, each 

 lobe with a group of brown bristles. Postnotum elliptical, prominent, black, 

 slightly pruinose. Pleurae brown, coxae luteous, clothed with elliptical, flat, 

 yellowish white scales and rows of pale bristles; prothoracic epimera clothed 

 with pale brownish-yellow scales, similar to those on mesonotum. 



Abdomen subcylindrical, flattened, tapering posteriorly; dorsal vestiture of 

 brownish-black scales, each segment with a broad basal yellowish-white band 

 which widens laterally and beyond the third segment reaches to the posterior 

 angle ; first segment with white scales and many pale setse ; venter largely yel- 

 lowish-white scaled, with a row of small lateral apical black patches. Cerci black. 



Wings rather narrow, hyaline ; petiole of second marginal cell a little shorter 

 than its cell, that of second posterior cell a little longer than its cell; basal 

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

 ish-black, outstanding scales broadly linear, brownish-black. Halteres whitish. 



Legs rather long and slender; femora black scaled above, yellowish-white 

 below, except towards tips, the extreme tips white sealed; tibiae black scaled, 

 numerous pale scales on under side forming an ill-defined stripe; tarsi black 

 scaled, the first joint with some pale scales beneath, the black scales increasing 

 outwardly, the terminal joints wholly black. Claw formula, 1.1-1.1-1.1. 



Length : Body about 5.5 mm. ; wing 5 mm. 



Male. — Proboscis rather long and slender, straight. Palpi exceeding the pro- 

 boscis by about the length of the last joint ; end of long joint and last two joints 

 slightly enlarged and with long, dense, black hairs; vestiture wholly black. 

 Antennae plumose, the last two joints long, slender, rugose, pilose, black, the 

 others short, pale, blackish at thickened insertions of hair-whorls; hairs of 

 whorls long, dense, brownish-black with yellow luster. Coloration similar to the 

 female. Wings narrower than in the female, the stalks of the fork-cells 

 longer, the vestiture sparse. Abdomen long, slender, depressed, the basal seg- 

 mental white bands much broader than in the female; lateral ciliation long, 

 dense, pale. Claw formula, 1.1—1.1—1.1. 



Length : Body about 6.5 mm. ; wing 5 mm. 



Genitalia (plate 26, fig. 181) : Side-pieces three times as long as wide; apical 

 lobe small, roundedly prominent; basal lobe hemispherical, densely setose, a 

 stout spine on the inner side. Clasp-filament long, swollen in middle, with a 

 row of fine subterminal setae and long, articulated terminal spine. Harpes 

 elliptical concave, inner margin revolute, tip curved, widely notched. Harpa- 

 gones with a long columnar stem which is slightly bent at basal third and bears 

 a little short pile; terminal filament narrowed at its base, tapering to tip, 

 widest at basal sixth. Unci approximate, revolute, forming a small basal cylin- 

 der. Basal appendages approximate, rounded, bearing several short, stout 

 spines. 



Larva, Stage IV (plate 118, fig. 407). — Head rounded, narrowed before eyes, 

 a slight notch at insertion of antennae, front margin broadly arcuate. Antennae 

 moderate, slender, a little larger at base, slightly spined, especially toward 

 base; a rather large tuft before middle; one longer and three short terminal 

 spines and a terminal digit. Both pairs of dorsal head-hairs single, ante-anten- 



