798 MOSQUITOES OF NORTH AMERICA 



more outstanding. Palpi short, about one-fourth as long as the proboscis; 

 vestiture dark brown, setae moderate. Antennae filiform, the joints subequaJ, 

 rugose, pilose, brown ; second joint slightly thickened, fusiform, pale at base ; 

 hairs of whorls sparse, moderate, black; tori subspherical, with a cup-shaped 

 apical excavation, yellowish shading to brown within, with a patch of fine setae. 

 Clypeus rounded triangular, depressed, with a median groove, dark brown, 

 nude. Eyes purplish-black. Occiput dark brown, clothed with narrow curved 

 scales on the vertex, broad flat ones on the sides, silvery yellowish-white in the 

 middle and along eye-margins, black on each side, white below, many erect, 

 forked black scales on the nape ; bristles along margins of eyes dark brown, those 

 projecting between eyes yellowish-white. 



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

 sides of mesonotum, with dark setae. Mesonotum dark brown, covered with 

 narrow curved scales, a rather broad, yellowish silvery-white median stripe 

 from anterior edge of mesonotum to posterior margin and involving the 

 antescutellar space, the remaining scales deep brown, bristles over roots of wings 

 and about antescutellar space brownish-yellow. Seutellum trilobate, a few 

 yellowish-white scales on mid lobe, each lobe with a group of dark brown 

 bristles. Postnotum elliptical, prominent, brownish luteous, nude. Pleurae 

 and coxae yellowish, clothed with patches of elliptical, fiat, white scales and pale 

 bristles. 



Abdomen subcylindrical, fiattened, tapering posteriorly; dorsal vestiture of 

 black scales with slight violaceous luster, bristles on posterior borders of seg- 

 ments yellowish, a row of large, segmental, lateral, basal, triangular white spots ; 

 first segment with black scales and many fine pale hairs ; venter yellowish-white 

 scaled, with a few black scales on apical angles of distal segments. Cerci black. 



Wings rather broad, 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 brown, with a blue 

 reflection along the costa, the outstanding ones narrowly Ugulate, denser and 

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



Legs slender, moderately long; vestiture blackish-brown, under sides of 

 femora yellowish-white, except at tips ; hind tibiae with the under sides narrowly 

 white. Claw formula, 1.1-1.1-1.1. 



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



Larva, Stage IV (plate 126, fig. 436). — Head rounded, wider than long, 

 narrowed before eyes, a slight notch at insertion of antennae, front margin 

 broadly arcuate. Antennae moderate, slender, curved, sparsely spined ; a small 

 tuft at middle ; a long and three short apical spines and a digit on a pedestal. 

 Eyes large, transverse, pointed. Both pairs of dorsal head-hairs single, ante- 

 antennal tuft multiple. Mental plate triangular, with a slender central tooth 

 and seventeen on each side, all slender and nearly equal, except a small basal 

 tooth which is distantly removed from the others. Mandible quadrate; two 

 filaments before tip ; an outer row of cilia from a collar; a row of fifteen fila- 

 ments on outer margin; dentition of four teeth on a process, first and fourth 

 longest; a stout spine before, a broad serrate fllament and four feathered hairs 

 within; process below furcate, with a row of hairs on upper margin and a tuft 

 at tip of each limb ; basal angle sharp, vrith three hairs within ; flve long hairs at 

 base. Maxilla hemispherical, divided by a suture ; inner half with two rows of 

 cilia and a row of very coarse spines on inner margin, a tuft of short stout hairs 

 at tip ; outer half with two moderate filaments above middle and a small sub- 

 apical spine; palpus small, with four slender apical digits. Thorax rounded, 

 wider than long ; hairs moderate. Abdomen stout, anterior segments shorter ; 



