822 MOSQUITOES OF NORTH AMERICA 



irre^larly distributed ; setae minute, curved black, those on labellae more promi- 

 nently outstanding. Palpi short, about one-fifth as long as the proboscis, 

 slender; vestiture black, a small white spot in the middle within, tip broadly 

 white. Antennae filiform, the joints subequal, rugose, black, with long pile; 

 second joint thickened towards apex ; tori subspherical, with a cup-shaped apical 

 excavation, yellowish, shading to black within, the dark part densely covered 

 with silvery- white scales; hairs of whorls sparse, long, black, the distal ones 

 much shorter. Clypeus elongate, rounded triangular with a slight impression 

 on outer half, dark brown, silvery pruinose. Eyes separated on frons, black. 

 Occiput dark brown, clothed with rather narrow curved scales in a narrow line 

 on the vertex, the others broad; color of vestiture yellow-brown shading into 

 black, a narrow silvery-white stripe in the middle of vertex and extending 

 forward between eyes to base of antennae, margins of eyes and lower part of sides 

 silvery- white ; a row of erect forked black and golden scales well back on the 

 nape ; bristles along margins of eyes black. 



Prothoracic lobes elliptical, remote dorsally, brown, similarly colored to sides 

 of mesonotum with an oblique band of silvery-white scales and with black 

 bristles. Mesonotum yellowish brown ; vestiture of small narrow curved scales, 

 dense and deep brown in a median longitudinal stripe on the dorsum, causing 

 the color to appear dark bronzy-brown, sparse on the sides, the dark median 

 stripe divided by a narrow silvery line from anterior edge to antescutellar space 

 and bordered on each side by a narrow golden, occasionally partly or wholly 

 silvery, subdorsal line running the whole length but interrupted at the middle; 

 a small silvery- white patch centrally on lateral area towards outer margin; 

 sides of antescutellar space and a short line above wing-insertion narrowly 

 silvered ; a silvery patch before wing-insertion ; setae rather coarse, black. Scu- 

 tellum trilobate, pale brown, mid lobe clothed with narrow, curved black scales, 

 each lobe tipped with broad silvery-white scales and bearing a group of black 

 bristles. Postnotum elliptical, prominent, yellow-brown, nude. Pleurae and 

 coxae yellowish, clothed with small remote patches of silvery white scales and 

 with rows of pale bristles. 



Abdomen subcylindrical, tapered posteriorly, fifth, sixth, and seventh seg- 

 ments apically expanded beneath; dorsal vestiture black, very narrowly pale- 

 scaled at bases of third, fourth and fifth segments, a series of large, lateral, basal 

 segmental silvery patches; venter with black and luteous scales intermixed, the 

 dark scales predominating on apical portions of segments ; bristles dark. Cerci 

 black. In some specimens the silvery lateral spots are ventrally produced on the 

 fifth, sixth and seventh segments to form subapical bands. 



Wings moderate, hyaline; petiole of second marginal cell one-third as long 

 as its cell, that of the second posterior cell somewhat shorter than its cell ; basal 

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

 blackish-brown, costa with blue-black reflection; outstanding scales ligulate 

 with rounded tips, those on forks of second vein dense and much broader. 

 Halteres yellowish, with blackish knobs. 



Legs slender, rather long; vestiture black with a bluish reflection, marked 

 with silver white; on the front and mid femora the white scales predominate 

 narrowly beneath, form a line along the under side to near apex and are irregu- 

 larly scattered over the sides ; hind femora with a narrow line of white scales 

 to near apex on both outer and inner sides ; knees broadly white-scaled ; tibiae 

 with a small white patch on under side about one-third from base; a small 

 white spot at bases of first and second joints of fore and mid tarsi ; hind tarsi 

 with a broad white ring at base of each joint which in last two covers three- 

 fourths of joint. Claw formula, 1.1-1.1-0.0. 



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



