394 MOSQTJITOES OF NORTH AMERICA 



Descbiption of Female, Male, and Labta of Cui^x filosus: 



Female. — Proboscis moderate, swollen at tip, labellae conically tapered ; vesti- 

 ture black with a slight bronzy reflection ; setse minute, curved, black, those on 

 labellae more prominently outstanding. Palpi short, one-fifth as long as pro- 

 boscis, slender, black with a few outstanding setae at base. Antennae moderate, 

 joints subequal, rugose, pilose, black, second joint not much longer than third; 

 tori subspherical, with a cup-shaped apical excavation, yellowish, brown on inner 

 side ; hairs of whorls sparse, moderate, black. Clypeus rounded triangular, con- 

 vex, brown, nude. Byes black. Occiput brown, clothed with broad, flat black 

 scales and many erect, forked ones, margins of eyes white-scaled, a patch of 

 flat white scales low down on sides; a row of bristles along margins of eyes. 



Prothoracic lobes elliptical, remote dorsally, with some brown bristles. Meso- 

 notum brown, clothed with narrow, curved bronzy-brown scales and rows of 

 stout black bristles. Scutellum trilobate, with similar vestiture to mesonotum, 

 each lobe with a group of brown bristles. Postnotum elliptical, prominent, 

 luteous brown, nude. Pleurae and coxae pale brownish, with rows of pale bristles. 



Abdomen subcylindrical, truncate at tip, clothed dorsally with black scales 

 with a strong coppery or blue reflection, a row of lateral, basal, triangolar, 

 segmental whitish spots; venter blackish scaled, with broad white bands at 

 bases of segments; posterior margins of segments with coarse brown hairs; tip 

 of abdomen bristly. 



Wings rather broad, hyaline ; petiole of second marginal cell about one-fourth 

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

 cross-vein distant about twice its own length from anterior cross- vein; scales 

 of veins brown, outstanding ones mostly narrowly ovate on second to fourth 

 veins outwardly, the other scales narrowly ligulate. Halteres whitiA, with dark 

 knobs. 



Legs moderately long, slender; vestiture black with a bronzy and blue reflec- 

 tion, femora whitish beneath. Claw formula, 0.0-0.0-0.0. 



Length : Body about 2 nun. ; wing 2 mm. 



Male. — Proboscis straight, gradually enlarged towards tip, black scaled. 

 Palpi exceeding the proboscis by more tiian the length of ihe last joint, slender, 

 apical portion somewhat enlarged, black, with many black hairs on end of long 

 joint and on last two joints; vestiture bronzy black. Antennae plumose; last 

 two joints long and slender, rugose, pilose, black, the others short, longer than 

 usual, very slender, whitish, with black rings at insertion of hair-whorls; hairs 

 long, black, moderately dense. Coloration similar to the female. Abdomen 

 subcylindrical, dorsally with bronzy and blue reflections, segments with basal 

 leaden whitish bands joined to a row of lateral white spots; lateral ciliation 

 long, coarse, brown. Wings narrower than in the female, the stems of the fork- 

 cells longer; vestiture sparser. Claw formula, 1.0-1.0-0.0. 



Length : Body about 2.5 mm. ; wing 2 mm. 



Genitalia (plate 12, flg. 80) : Side-pieces over twice as long as wide, tips 

 conically tapered ; a prominence arising somewhat beyond middle, divided into 

 three branches, outer forked at apex and bearing three filaments on each fork, 

 innermost one long; the other two branches each with a single long filament ex- 

 panded near apex and terminating in a sharp point. Clasp-filament long, thick, 

 constricted at middle, tip rounded capitate, with a row of fine curved setae on 

 outer margin and a short articulated spine on inner semi-detached portion. 

 Harpes forked at right angles, the inner branch long and slender, terminating 

 in a row of teeth. Harpagones divided, both branches short, curved, smooth. 



Laa-va, Stage IV (plate 113, fig. 379). — Head broad, transverse, widest 

 through eyes, slightly convex on sides, a large notch at insertion of antennae. 



