438 MOSQUITOES OP NORTH AMERICA 



DESCKIFTI0I7 OF FStLiJM, MAI£, AST} LABVA OF CULEX FLEUBISTBIATU8 : 



Female. — Proboscis long and slender, thickened towards apex, labellae con- 

 ically tapered ; vestiture black ; setae minute, curved black, those on labellae more 

 prominently outstanding. Palpi short, black, one-fifth as long as proboscis, 

 with some outstanding setae at base. Antennae moderate ; joints subequal, rugose, 

 pilose, black, second joint scarcely enlarged; tori subspherical, with a cup- 

 shaped apical excavation, pale luteous ; hairs of whorls sparse, black and rather 

 short. Clypeus small, rounded convex, brown, nude. Eyes black. Occiput 

 black, clothed with narrow, curved pale ochraceous yellow shining scales, 

 margins of eyes pale; numerous erect, forked yellowish scales dorsally, a patch 

 of broad flat black scales on either side; cheeks narrow, clothed with flat white 



Prothoracic lobes elliptical, remote dorsally, clothed with narrow, curved pale 

 yellowish scales and a few brown bristles. Mesonotum blackish brown, with 

 two bare, narrow impressed longitudinal lines; vestiture of rather coarse and 

 dense, narrow curved scales, shining yellowish intermixed with deep brown 

 ones, the latter forming seven ill-defined patches, two spots before and above the 

 lateral depression on each side, a single patch before ante-scuteUar space, an 

 elongate spot basally on each side above roots of wings; bristles black, long. 

 Scutellum trilobate, dark brown, clothed vrith narrow, curved golden ochraceous 

 scales, each lobe with a group of black bristles. Postnotum elliptical, blackish, 

 nude. Pleurae greenish luteous, a dark transverse band beneath wings and 

 another above base of coxae; two small patches of elliptical, flat white scales; 

 coxae pale greenish, fore coxae with a patch of black scales on outer side. 



Abdomen subcylindricaJ, depressed, truncate at tip, clothed dorsally with 

 black scales with a slight metallic reflection, a series of narrow white basal seg- 

 mental bands, joining a row of lateral triangular basal segmental white spots ; 

 first segment with a dorsal patch of black scales ; venter clothed with yellovirish- 

 white scales and rather narrow black bands at tips of segments. 



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 distant more than its own length from anterior cross- vein ; scales of veins 

 bronzy black, narrowly ligulate, becoming somewhat denser apicaUy. Halteres 

 white, with black knobs. 



Legs slender, rather long ; femora black above, white beneath nearly to apex, 

 tips narrowly white; tibiae black with a blue reflection, tips narrowly whitish; 

 tarsi black, hind pair with small basal white rings on the joints, occupying basal 

 fourth on last joint, obsolete on fore tarsi, the first three joints very narrowly 

 ringed on median pair. Claw formula 0.0-0.0-0.0. 



Length : Body about 2.5 mm. ; wing 3.8 mm. 



Male. — Proboscis more swollen than in the female. Palpi exceeding the 

 proboscis by the length of the last joint, slender, penultimate joint slightly 

 thickened, last joint tapered; vestiture black, with a narrow white ring at bases 

 of last two joints and a broad one at middle of long joint; short black hairs on 

 last two joints and tip of long joint. Antennae plumose ; last two joints long 

 and slender, rugose, pilose, black, the others short, whitish, with a black ring at 

 insertions of hair-whorls; hairs long, black, dense. Coloration similar to the 

 female. Abdomen elongate, depressed, broadened apically; dorsal white bands 

 somewhat broader; lateral ciliation long, rather coarse, moderately abundant, 

 yellowish. Wings narrower than in the female, the stems of the fork-cells about 

 the same, vestiture somewhat more sparse. Claw formula, 1.1-1.1-0.0. 



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



Genitalia (plate 12, fig. 86) : Side-pieces twice as long as wide, tips conically 

 tapered, a median quadrate prominence cleft nearly to its base, the outer bearing 



