674 MOSQUITOES OF NORTH AMERICA 



stout, about one-fifth the length of the proboscis, black scaled, the tips white ; 

 setae moderate, black. Antennae with the distal joints longer than the basal ones, 

 rugose, black, pilose; tori subspherieal, with a cup-shaped apical excavation, 

 luteous brown, some pale scales on inner side ; hairs of whorls moderate, sparse, 

 black. Clypeus elliptical, prominent, dark brown, nude. Eyes black. Occiput 

 dark brown, broadly clothed with iine, narrow curved scales, shining yellowish 

 centrally, rich brown laterally, cheeks clothed with broad, flat white scales, a 

 patch of black ones above at ocular margin, numerous slender, upright black 

 forked scales on the occiput; bristles moderate, dark brown, those projecting 

 between eyes dense and pale. 



Prothoraeic lobes elliptical, remote dorsally, dark, clothed with narrow 

 curved scales, bronzy brown above, white below, and black sets. Mesonotum 

 dark brown, clothed thickly and uniformly with narrow curved dark bronzy 

 brown scales, lighter only about the antescutellar space and above roots of wings ; 

 bristles moderate, black. Scutellum trilobate, brown, clothed with brassy scales, 

 each lobe with a group of brown setae. Postnotum conical, prominent, luteous 

 brown, nude. Pleurse and coxae dark brown, clothed with elliptical, flat, white 

 scales and pale setae. 



Abdomen subcylindrical, flattened, posterior segments tapering, the cerci 

 exserted; dorsal vestiture of black scales, each segment with a narrow basal 

 band of dull yellowish white scales, a row of large, pure white patches along the 

 sides medianly on the segments, somewhat larger posteriorly, the last two 

 visible from a dorsal view; venter clothed with pale yellow and white scales 

 sparsely intermixed with black ones, with subapical ill defined black segmental 

 bands. Cerci black. 



Wings rather broad, hyaline ; petiole of second marginal cell shorter than its 

 cell, that of second posterior cell also shorter than its cell ; basal cross-vein about 

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

 outstanding ones broadly linear, a very slight thickening of the scales at base 

 of third vein. Halteres pale. 



Legs moderately slender ; femora partly pale beneath, black scaled above, tips 

 black; knees white; tibise black, under side partially whitish scaled, the stiff 

 outstanding setae black ; tarsi black ; each joint of hind tarsi with a very narrow 

 white basal ring, nearly absent on the last ; fore and mid legs with the first three 

 joints narrowly white at base, last two joints wholly black. Claw formula, 

 1.1-1.1-0.0. 



Length: Body about 3.5 mm.; wing 3 mm. 



Male. — Proboscis straight, long and slender, with a narrow white ring before 

 the middle. Palpi longer than proboscis, the last two joints slightly enlarged, a 

 broad white ring at middle of long joint and narrower ones at bases of last 

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

 hairs. Antennae plumose, the last two joints long and slender, pilose, rugose, 

 black, the others short, brownish, with a narrow black ring at insertions of 

 hair-whorls; hairs long, dense, black with a brownish tint. Coloration similar 

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

 longer; vestiture scanty. Abdomen elongate, depressed, the pale segmental 

 bands broader than in the female, the lateral spots small, nearly obsolete on 

 proximal segments; lateral ciliation long, dense, pale brown. Tarsal white 

 rings broader than in the female, particularly on last joint of hind tarsi. Claw 

 formula, 8.1-1.1-0.0. 



Length : Body about 4 mm. ; wing 3 mm. 



Genitalia (plate 30, fig. 304) : Side-pieces over twice as long as wide, inner 

 third divided by a slight groove, apical lobe absent, basal lobe small, conically 



