796 MOSQUITOES OF NORTH AMERICA 



Prothoracic lobes elliptical, remote dorsally, dark brown, concolorous with 

 the sides of the mesonotum, with dark setse. Mesonotum dark brown, covered 

 with narrow curved scales, a rather broad, straight, medio-dorsal line silvery 

 yellowish-white from anterior edge of mesonotum to antescutellar space, similar 

 scales bordering that space, the rest of the vestiture dark brown ; bristles dark. 

 Scutellum trilobate, the mid lobe with pale yellow scales, each lobe with a group 

 of dark-brown bristles. Postnotum elliptical, prominent, brovmish luteous, 

 nude. Pleurae and coxse brownish, clothed with patches of elliptical, flat, dull 

 white scales and pale bristles. 



Abdomen subcylindrieal, flattened, tapering posteriorly; dorsal vestiture of 

 dull blue-black scales, bristles on posterior borders of segments yellowish, a row 

 of lateral, basal triangular white spots ; first segment with black scales and many 

 fine pale hairs ; venter yellowish-white sealed, with purplish-black scales along 

 apical angles of segments, tending to form narrow bands. Cerci black. 



Wings moderate, hyaline ; petiole of second marginal cell about half as long 

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

 about its own length distant from anterior cross-vein; scales brownish-black, 

 with a blue reflection along the costa, outstanding ones narrowly ligulate, denser 

 and slightly broader on forks of second vein. Halteres pale, with blackish 

 knobs. 



Legs slender, moderately long ; vestiture bronzy-black ; under side of femora 

 yellowish-white except at tips ; tibiae and flrst joint of hind tarsi with a narrow 

 line of yellowish-white scales on under side. Claw formula, 1.1-1.1-1.1. 



Length : Body about 4.5 mm. ; wing 4 mm. 



Male. — Proboscis longer and more slender than in the female, straight, black 

 scaled. Palpi exceeding the proboscis by nearly the length of the last joint; 

 end of long joint and last two joints considerably swollen and with dense, long 

 black hairs; vestiture bronzy-black throughout. Antennae plumose, the last 

 two joints slender, rugose, pilose, black, the others short, pale, narrowly black 

 ringed at insertions of hair- whorls; hairs long, dense, brownish-bladk ; tori 

 entirely blackish. Coloration similar to the female. Abdomen elongate, de- 

 pressed ; lateral spots of segments larger than in the female, the eighth segment 

 with a basal white band; lateral ciliation of abundant, long, fine brown hairs. 

 Wings narrower than in the female, the stalks of the fork-cells longer, the vesti- 

 ture less abundant. Claw formula, 2.1-2.1-1.1. 



Length : Body about 4.5 mm. ; wing 3.5 mm. 



Genitalia (plate 28, fig. 194) : Side-pieces over twice as long as wide ; apical 

 lobe slender, prominent, conical ; basal lobe rounded conical, setose, with a stout 

 spine within. Clasp-filament slender, slightly expanded in middle, with a long 

 terminal articulated spine. Harpes narrowly elliptical, concave, inner margin 

 thickened, revolute, tip pointed, outcurved. Harpagones with a slender 

 columnar stem and a terminal filament, which is linear, pointed at tip, not as 

 long as stem. Unci approximate, revolute, fonning a stout basal cylinder. 

 Basal appendages slender, bearing five short spines. 



Larva, Stage IV (plate 123, fig. 428). — Head rounded, narrowed before eyes, 

 a slight notch at insertion of antennae, front margin arcuate, excavate between 

 the incurved clypeal spines. Antenna moderate, slender, slightly tapered out- 

 wardly, sparsely spined, a small tuft before middle ; a long spine, three short 

 ones and a digit at tip. Both pairs of dorsal head-hairs single ; ante-antennal 

 tuft large, multiple. Mental plate large, triangular, with a slender central 

 tooth and fifteen on each side, basal ones more remotely spaced, the last irregu- 

 lar. Mandible quadrangular, slightly spined toward base ; two filaments before 

 tip; an outer row of cilia from a collar; a row of long filaments on outer margin ; 

 dentition of four teeth on a process, the first the longest, a spine before, a broad 



