268 MOSQUITOES or north AMERICA 



brown ones on vertex ; broad, flat white ones on sides ; a row of black bristles 

 along margins of eyes. 



Prothoracie lobes elliptical, remote dorsally, clothed with black setae. Meso- 

 notum brown, with two dorsal impressed paler brown lines showing faintly on 

 anterior half ; vestiture of narrow, curved lustrous-brown scales, giving a bronzy 

 luster to the thorax, bristles black, numerous. Scutellum trilobate, luteous, with 

 narrow, curved, lustrous pale-brown scales, each lobe with a tuft of blackish 

 bristles. Postnotum elliptical, prominent, dull luteous, nude. Pleurae and coxae 

 greenish luteous, shaded with black beneath the wings and in the center, with 

 flat white scales and rows of small brown bristles. 



Abdomen subcylindrical, depressed, truncated at tip ; dorsal vestiture brown- 

 ish black, with a slight greenish-metaUic reflection, a rather broad yellowish- 

 white band at base of each segment, except the first, joining a row of lateral 

 basal, triangular, white spots, showing posteriorly from a dorsal view; venter 

 yellowish white-scaled. 



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

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

 vein a little less its own length distant from anterior cross- vein ; scales blackish 

 brown, blackish on costa, the outstanding ones broadly linear, very dense on 

 forks of second vein. Halteres whitish. 



Legs slender, moderate, bronzy brown, femora white beneath almost to the 

 tip ; tibiae with brassy reflection beneath ; tarsi brownish black, with a slight blue 

 reflection, the hind with very narrow pale bands at base and apex of each joint, 

 obsolete on fore and mid tarsi ; knees pale. Claw formula, 0.0-0.0-0.0. 



Length : Body about 2.5 mm. ; wing 3 mm. 



Male. — Proboscis straight, slightly longer than in the female. Palpi slender, 

 exceeding the proboscis by nearly the length of the last two joints, end of long 

 joint and last two joints with long black hairs; vestiture uniformly bronzy 

 brown. Antennae plumose; last two joints long and slender, rugose, pilose, 

 black, the others short, pale, with black rings at insertion of hair-whork ; hairs 

 long, dense, black. Coloration similar to the female. Wings slightly narrower 

 than in the female, the stems of the fork-cells hardly longer; vestiture sparse. 

 Abdomen long, slender, expanded towards apex, with distinct white bands at 

 bases of segments dorsally; lateral cUiation of long, fine, dense, pale yellowish 

 hairs. Claw formula, 1.1-1.1-0.0. 



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



Genitalia (plate 15, fig. 109) : Side-pieces over twice as long as wide, conically 

 tapered at tip ; marginal appendages on a subapical truncated prominence con- 

 sisting of three rods vrith hooked tips and a leaf -like appendage and two shorter 

 rods. Clasp-filament stout, rather long, curved, with a small articulated ap- 

 pendage. Harpes furcate, the lower branch curved, with a rounded tip, the 

 inner pointed and finely setose. Harpagones furcate, inner branch small, 

 rounded, outer divided into many slender, elongated teeth. Basal appendages 

 rounded, setose, very remote. 



Larva, Stage IV (plate 96, fig. 315).— Head rounded, widest through the 

 eyes; antennae long, stout, spinose, a large tuft at outer third, the part beyond 

 slender; head-hairs in threes, ante-antennal tuft multiple. Body with the 

 skin glabrous; lateral abdominal hairs in twos after second segment; lateral 

 comb of eighth segment of many spines in a large patch. Air-tube six times as 

 long as wide, tapering on outer half, slightly fusiform; pecten short, not reach- 

 ing basal third, followed by three tufts, the middle one moved laterally out of 

 line, all two-haired; terminal hooks minute. Anal segment longer than wide, 

 ringed by the plate, becoming spinous on posterior margin ; dorsal tuft of three 



