976 MOSQUITOES OF NORTH AMERICA 



black scales predominating, the white ones forming a broad ring at tip and a 

 narrow one at false articulation. Antennae filiform, the joints rather short, 

 subequal, densely pilose, blackish; hairs of whorls short, sparse, black; tori 

 small, subspherical, with an apical cup-shaped excavation, black with gray 

 pruinosity. Clypeus prominent, subtriangular, blackish, pruinose, nude. Eyes 

 well separated at vertex, black. Occiput dark, clothed with erect and semi-erect 

 triangular scales, white on the vertex, black ones on the sides, a group of long 

 white hair-like scales projecting forward on the vertex; a row of setae along 

 margins of eyes. 



Prothoracic lobes small, lateral. Mesonotum elongate, narrow, blackish- 

 brown, pruinose, a pair of velvet-black sublateral spots centrally at anterior ends 

 of a pair of broad bare stripes, a single large black spot on anteseutellar space ; 

 vestiture of rather sparse, small, broadly lanceolate, curved yellowish-white 

 scales and with rows of short blackish bristles. Scutellum coUar-like, uniform, 

 gray pruinose, with a marginal row of black bristles and clothed with small 

 white scales like those of mesonotum. Postnotum elliptical, prominent, dark 

 brown, nude. Pleurae and coxae blackish brown, with rows of black bristles and 

 patches of small white scales mostly on the coxae. 



Abdomen subcylindrical, flattened, subtruncate at tip, blackish ; dorsal vesti- 

 ture of rather broad, flat, dull ochreous scales, numerous black bristles, a lateral 

 patch of black scales at posterior angles of segments, forming outstanding tufts ; 

 venter clothed with broad yellowish-white scales, with segmental apical patches 

 of black ones forming incomplete apical bands ; hairs coarse and abimdant, par- 

 ticularly along lateral margins. 



Wings (plate 41, fig. 12) moderate, hyaline; petiole of second marginal cell 

 much shorter than its cell, that of second posterior cell longer than its cell ; basal 

 cross-vein distant more than its own length from anterior cross-vein ; scales of 

 veins black and yellowish-white, the outstanding ones lanceolate ; black scales in 

 patches as follows : six spots on the costa, first and second small, on basal fifth, 

 third, fourth and fifth large, separated by small yellowish spots, subapical spot 

 small; first vein with five black spots, the first and second small and opposite 

 the third costal spot, the third, fourth and fifth opposite the fourth, fifth and 

 sixth costal spots and nearly as large; second vein with the stem spotted black 

 and yellow, fork with a black patch at base, a spot near base and tip of each 

 branch; third vein with small black spots near base and apex; fourth vein 

 with a black spot at end of stem and one near apex of each fork ; fifth vein with a 

 black patch before fork, upper branch with three black patches, lower one with 

 a large subterminal one ; sixth vein with a black patch near base and apex ; 

 fringe dark, spotted with white at the terminations of veins. Halteres whitish, 

 with dark knobs. 



Legs long and slender; femora clothed on outer side with black scales and 

 some yellow ones intermixed, a small black ring just beyond the base, middle 

 and hind pairs with two small white spots just before apex ; tibiae black, a yellow 

 line on inner side ; knees white ; tarsi black with some yellow scales intermixed ; 

 fore and mid tarsi with a white ring at tip of first, second, third, and fifth joints, 

 broadest and most distinct on fore tarsi ; hind tarsi with apical half of second 

 joint, all of third and fourth, and apical third of fifth joints white. Claw 

 formula, 0.0-0.0-0.0. 



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



Male. — Palpi as long as the proboscis, the last two joints thickened into a 

 distinct club and bearing long brown hairs; the two terminal joints dorsally 

 whitish scaled, with a narrow black ring at the articulations, long joint with a 

 patch of white scales at apex and a median white ring. AntennsB densely plu- 

 mose; last two joints long and slender, rugose, pilose, black, the others short, 

 pale, with blackish rings bearing long, dense, silky brown hairs. Coloration as 

 in the female. Abdomen long, depressed, rather narrow, very slightly expanded 

 beyond middle; lateral ciliation of rather short, coarse yellowish hairs. Wings 



