184 MOSQUITOES OF NORTH AMERICA 



the sides, nearly absent in front, but finely pubescent. Eyes black. Occiput 

 densely clothed with flat gray scales with a bright blue reflection, silvery in some 

 lights, a row of short, erect, forked black scales on posterior margin ; two coarse 

 bristles at vertex, a row of setse along margins of eyes, the lateral ones longer. 



Prothoracic lobes elliptical, remote dorsally, densely clothed with shining 

 silvery scales and a few black bristles. Mesonotum pale brown, darker in the 

 middle, clothed with rather broad, curved bronzy-black scales, setae along sides 

 and at roots of wings dense, black, short. Scutellum trilobate, clothed with 

 broad, flat, metallic greenish blue scales, each lobe with a tuft of black bristles. 

 Postnotum elliptical, prominent, brown, with a groove each side of the middle, 

 the grooves converging posteriorly, where there is a group of coarse black setse 

 preceded by a double elongate patch of small, flat iridescent scales. Pleurae and 

 coxae luteous, clothed with small, elliptical, flat silvery scales and tufts of brown 

 bristles. 



Abdomen subcylindrical, truncate at tip, the dorsal vestiture black, with green 

 and blue reflection, venter golden, with a white reflection, colors separated on 

 sides in an undulating line ; tip with many stiff bristles. 



Wings narrow, hyaline, iridescent; petiole of second marginal cell one-third 

 as long as its cell, that of second posterior shorter than its cell ; basal cross- 

 vein about its own length beyond anterior cross-vein ; scales of veins brown, 

 with a blue reflection on costa, dense, overlapping, broadly elliptical, many 

 obliquely subtruncate. Halteres black, except at base. 



Legs long and slender, black, with a strong violet and blue reflection ; femora 

 white beneath, except at tip ; posterior tibias white beneath at the base ; mid legs 

 with the four terminal tarsal joints white, the last one with blackish tip ; hind 

 legs with the last two and the apical half of the third tarsal joints white. Claw 

 formula, 0.0-0.0-0.0. 



Length : Body about 6 mm. ; wing 4.5 mm. 



Male. Palpi four-fifths as long as proboscis, slender, uniform, with a few 

 outstanding setas towards tips of joints. Antennae long and slender, with last 

 two joints long and slender, rugose, pilose, black, the others shorter, yet about 

 five times as long as wide, black, with narrow, irregular white rings below in- 

 sertions of hair-whorls ; hairs long, rather dense, scarcely plumose, black. Color- 

 ation as in the female, terminal segment of abdomen metallic-blue scaled above. 

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

 Claws of the fore and mid tarsi large, unequal, strongly curved, one fore claw 

 with a large tooth. Claw formula, 1.0-0.0-0.0. 



Length : Body about 5.5 mm. ; wings 4 mm. 



Genitalia (plate 6, fig. 41) : Side-pieces about twice as long as wide, the tips 

 conically tapered ; basal lobes large, rounded, setose. Clasp-filaments long and 

 slender, with an articulated terminal claw. Harpes prominent, ^\"ith thickened 

 inner margin and curved spinose tip. Harpagones rather prominently exserted, 

 forming a basal cone. Basal appendages longer than wide, with a row of coarse, 

 long terminal setae. 



Larva, Stage IV (plate 93, fig. 300). Head rounded, somewhat pointed be- 

 fore, the labrum triangular, truncate ; mandibles strongly projecting ; antenna 

 moderate, slender, less prominent than mandibles, with a single small hair near 

 tip; head-hairs all single. No lateral comb on eighth segment, a rounded 

 chitinous phite bearing a single stout seta; a large multiple tuft behind it. Air- 

 tube subfusiform, widened at basal third, smooth, with a large tuft posteriorly, 

 about two and a half times as long as wide; terminal hooks small. Anal seg- 

 ment longer than wide, with a large dorsal plate, spinosely roughened on its 



