696 MOSQUITOES OF NORTH AMERICA 



area and over roots of wings. Scutellum trilobate, luteous, clothed with narrow 

 pale scales, each lobe with a group of golden-brown bristles. Postnotura ellip- 

 tical, prominent, dark brown, nude. Pleura pale brown, coxse yellowish, clothed 

 with elliptical, flat, white scales in patches and rows of pale bristles ; prothoracic 

 epimera with brown scales similar to those on mesonotum. 



Abdomen subcylindrical, flattened, the posterior segments tapering; dorsal 

 vestiture dull black, a band of sordid-white scales at the base of each segment, 

 nearly divided by a median excision, more markedly so on posterior segments, 

 lateral margins of segments with an elongate patch of white scales reaching 

 from near base close to apex and narrowly separated from the basal bands, some 

 white scales at apical margins of sixth and seventh segments; first segment 

 with a large patch of yellowish-white scales and with many pale hairs ; venter 

 clothed with yellowish-white scales, basally on the segments a median row of 

 elongate black patches, sometimes joined with apical lateral marks into broad 

 Y-shaped markings. Cerci black. 



Wings moderate, hyaline ; petiole of second marginal cell much shorter than 

 its cell, that of second posterior cell about equal to its cell ; basal cross-vein about 

 its own length distant from anterior cross- vein ; scales of veins brownish black, 

 those on costa and first vein with a blue reflection, the outstanding ones long 

 and narrowly linear. Halteres whitish. 



Legs moderately slender; femora with yellowish- white scales beneath and 

 mostly black ones above, the extreme tips pale; tibiae clothed with black and 

 pale yellow scales intermixed, the latter predominating on the inner sides, a 

 small pale spot at base ; tarsi black, each joint of hind ones with a small yellowish 

 white basal ring, the first joint with many yellowish scales on inner side; fore 

 tarsi without rings on last two joints, mid tarsi without ring on last joint. Claw 

 formula, 1.1-1.1-1.1, more rarely 1.1-1.1-1.0 or 1.1-1.1-0.0. 



Length : Body about 5 mm. ; wing 4.5 mm. 



Male. Proboscis straight, moderately long. Palpi exceeding the proboscis 

 by about the length of the last joint, terminal joints slightly enlarged ; vestiture 

 black, a white ring at base of each of the last two joints and at middle of the 

 long joint ; end of long joint and the last two joints with many dense black and 

 reddish brown hairs. Antennae plumose, the last two joints long and slender, 

 rugose, pilose, black, the others short, white, with a broad black ring on the 

 incrassatcd insertions of the hair-whorls ; hairs of whorls long, dense, brown with 

 yellowish luster. Coloration similar to the female. Wings narrower than in the 

 female, stems of the fork-cells longer; vestiture sparse. Abdomen long, 

 depressed, straight-sided, the white basal bands less incised and broader than 

 in the female; lateral ciliation long and abundant, pale yellowish. Claw for- 

 mula, 1.1-1.1-1.1. 



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



Genitalia (plate 34, fig. 225) : Side-pieces stout, about twice as long as 

 broad, tips conically tapered, apical lobe absent, basal lobe forming a prominent 

 angle, large, densely hairy. Clasp-filament obliquely subtruncate, with a short 

 branch on inner side at apical fourth which bears a rather long articulated spine, 

 three small hairs at tip and a few minute ones on the surface. Harpes elliptical, 

 concave, inner margin thickened and revolute, tip pointed and bent outward. 

 Harpagones absent. Unci small, approximate, the tips attenuated, revolute, 

 curved inward, serrate on the proximal aspect. Basal appendages undeveloped. 



Larva, Stage IV (see figure of the entire larva, plate 66). Head rounded, 

 broad, narrowed but nearly straight before the eyes, the front margin broadly 

 arcuate. Antennae moderate, subcylindrical, slightly tapered, shortly spined all 

 over ; a small tuft a little before middle ; a terminal slender spine, a stout spine, 

 two small digits and one on a pedestal. Eyes large, transverse, pointed. Upper 



