540 MOSQUITOES OF NORTH AMEEICA 



black setse on the disk ; venter brownish black, setose, with scale vestiture similar 

 to dorsum but more scant. 



Wings rather narrow, entirely smoky brown, darkest on the costa ; petiole of 

 second marginal cell nearly as long as its cell, that of second posterior cell 

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

 wing-scales blackish with a dark-blue metallic luster, the outstanding ones 

 long and narrowly lanceolate. 



Legs long, appearing stout on account of the dense erect vestiture; rather 

 uniformly clothed with broad, erect, blue-black scales with metallic violet and 

 brilliant iridescent luster, except the last three joints of tarsi which have the 

 scales but slightly raised, blue black ; tips of middle and hind femora with small 

 patch of grayish-white scales ; outstanding scales subtruncate, partly sessile and 

 partly with long slender stalk, giving a characteristic shaggy appearance. Claw 

 formula, 1.1-1.1-1.1. 



Length : Body about 7 mm. ; wing 6.5 mm. 



Male. Proboscis straight, slender, metallic-blue scaled. Palpi exceeding 

 the proboscis by the length of the last two joints; last two joints thickened, 

 together about three-fourths the length of the long joint; long joint with a 

 median false articulation; vestiture of black scales mixed with blue metallic 

 ones and very numeroiis long black setae at outer third of long joint and on the 

 two apical ones. Antennge densely plumose; last two joints long and slender, 

 the others short, pale, black-ringed at origins of the hair-whorls ; second joint 

 short, with a number of long black scales. Coloration similar to the female. 

 Abdomen long, depressed, broadened to fifth and sixth segments, with abundant, 

 fine, black lateral ciliation ; dorsal scales with a bright blue luster. Wings nar- 

 rower than in the female, stalks of fork-cells longer, vestiture less abundant 

 Legs densely clothed with erect scales practically throughout. Claw formula, 

 2.1-3.1-1.1. 



Length : Body about 9 mm. ; wing 6.5 mm. 



Genitalia (plate 20, fig. 144) : Side-pieces long, over t\vice as long as wide, 

 tips rounded. Clasp-filament long, nearly uniform, slightly curved, tip angu- 

 larly truncate; a stout terminal claw; a row of setaa along inner margin. 

 Harpes thickened, concave, inner margin thickened and revolute, tip with a 

 point directed outward. Harpagones with a long, slender stem, tip enlarged, 

 bearing many setae and a large leaf-like appendage with curved pointed tip. 

 Unci forming a double basal cylinder, revolute, inner margins dentate. 



Larva, Stage IV (plate 114, fig. 389). Head subquadrate, wider than long, 

 posterior angles rounded; eyes prominent; antennae inserted before middle of 

 side; front slightly emarginate. Antennae cylindrical, slightly tapered, with 

 coarse tooth-like spines on one side of basal two-thirds ; a spine-like hair at outer 

 third ; a long hair, three spines and a digit at tip. Eyes large, pointed. Inner 

 pair of dorsal head-hairs single, outer pair small tufts. Mouth-brushes inserted 

 on outer angles of head, folded downward and backward. Mental plate tri- 

 angular, with a central tooth and nine on each side, the last one prominent. 

 Mandible quadrangular, tapering and pointed at base ; a patch of small spiuules 

 on outer aspect ; a filament before tip ; an outer row of short filamentous cilia ; 

 outer margin with small notches; dentition of two sets of teeth strongly pro- 

 jecting, the first a long tooth, concave below, its lower side with three sharp 

 incisions ; second tooth similar but smaller, lower side with five incisions ; a flat 

 irregular dentition below; basal angle roundedly prominent, with four long 

 hairs within ; a row of long hairs at base. Maxilla irregularly conical, obliquely 

 produced inward, divided by a bent suture ; inner portion with a few spines and 

 a pair of short filaments; a tuft of coarse spines at tip; outer half with short 

 coarse spines along outer margin and at bend in suture; a pair of short clear 



