606 MOSQIJITOES OF NORTH AMERICA 



rounded and followed on the cheeks by flat, broad white scales ; eyes bordered 

 by a row of curved black bristles. 



Prothoracie lobes moderate, elliptical, remote dorsally, clothed with narrow, 

 curved, white scales and black bristles. Mesonotum brown, darker in a pair of 

 rather broad, diffused submedian stripes and on the lateral areas, subdorsal and 

 sublateral rows of black bristles; vestiture of narrow, curved silvery-white scales, 

 a rather broad, Hi-defined, dorsal stripe of golden-brown scales and large 

 patches of the same color on the lateral depressions and above roots of wings ; 

 bristles black, numerous at roots of wings. Scutellum trilobate, brown, each 

 lobe with a large patch of narrow curved silvery-white scales and about eight 

 brown bristles. Postnotum elliptical, prominent, dark brown with a slight 

 whitish pruinosity, nude. Pleurae and coxae brown, clothed with narrow, ellipti- 

 cal, flat, white scales and brownish bristles. 



Abdomen subcylindrical, flattened, tapering posteriorly, the cerci prominently 

 exserted; dorsal vestiture of black scales and dark brown scales, with broad, 

 irregular, apical segmental bands of dull white scales, medianly more or less 

 produced and occupying nearly half the segments ; first segment with a patch 

 of white scales and many pale hairs ; seventh segment with the white irregularly 

 distributed and predominating; sides with an irregular row of white scales 

 forming an indefinite line ; venter clothed with whitish-golden scales with some 

 dark scales intermixed; setae short, black dorsally, golden ventrally; cerci black. 



Wings rather broad, hyaline, iridescent; petiole of second marginal cell 

 slightly longer than its cell, that of second posterior cell about equal to its 

 cell; basal cross- vein rather less than its own length distant from anterior cross- 

 vein ; veins brown ; scales brown and white intermixed, the dark ones predomi- 

 nating, recumbent scales rather broad, truncate and subtruncate, the outstand- 

 ing scales on apical half of wing ligulate and narrowly lanceolate, brown. 

 Halteres entirely pale. 



Legs moderate ; femora clothed with whitish scales below towards base, upper 

 side to tips black mixed with white scales, extreme base and apex white, a nar- 

 row white subapical ring; tibiae with black and white scales above, entirely 

 white below; tarsi black with pale scales intermixed, each joint with a very nar- 

 row yellowish-white basal ring which is almost obsolete on fore and middle tarsi, 

 the last two joints being entirely black. Claw formula, 0.0-0.0-0.0. 



Length : Body about 4 mm. ; wing 3.5 mm. 



Male. — Proboscis straight uniform, with an ill-defined pale ring beyond 

 middle. Palpi long, exceeding the proboscis by about the length of the last 

 joint, last two joints subcylindrical, hardly enlarged ; vestiture black with white 

 scales intermixed, a narrow white ring at the false articulation of the long joint; 

 end of long joint and the last two joints with long, dense brownish hairs. 

 Antennae plumose ; last two joints long and pilose, the others short, black at in- 

 sertions of hair-whorls, whitish beyond; hairs of horls long and dense, brown 

 with yellow luster. Coloration similar to the female. Wings narrower than in 

 the female, the stems of the fork-cells longer, the vestiture less abundant. 

 Abdomen elongate, depressed, the broad white apical segmental bands diffused 

 posteriorly, the last two segments entirely white ; lateral ciliation long, brownish 

 yellow. Claw formula, 1.0-1.0-0.0. 



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



Genitalia (plate 21, fig. 152) : Side-pieces more than twice as long as wide, 

 conically tapered ; apical lobe slightly developed, forming a slight inner angle ; 

 basal lobe absent. Harpes flat, concave, inner margin thickened and revo- 

 lute, divided at tip, fonning several teeth directed outwardly. Harpagones 

 small, with a slender ligulate base and slightly expanded tip bearing four stout 

 setae. Unci contiguous, forming a stout cone with rounded tip. 



