722 MOSQUITOES OF NORTH AMERICA 



boscis and palpi deep brown, the latter rather thick; antennae deep brown, except 

 the basal joint and base of the second joint, which are bright testaceous, basal joint 

 with black bristle-like hairs on the inside. 



Thorax deep dusky brown, with narrow-curved scattered bronzy scales, with 

 numerous black bristles in front and a few over the roots of the wings; scutellum 

 brown, with numerous large and small border-bristles to the mid lobe; metanotum 

 brown; pleurae brown, with patches of grey scales. Abdomen entirely covered with 

 dusky-black scales, the segments with more or less marked yellowish-grey basal 

 lateral spots; border-bristles dusky; venter with dull creamy grey scales and traces 

 of dusky apical bands. Legs entirely brown, except the coxae and bases of the 

 femora, which are pallid grey; ungues large, equal, all three pairs with a very large 

 tooth. 



Wings very slightly brown, with typical brown Culex scales; the fork-cells short; 

 the first sub-marginal a little longer and narrower than the second posterior, its base 

 about level with that of the latter, its stem about half the length of the cell; stem 

 of the second posterior about two-thirds the length of the cell; posterior cross-vein 

 longer than the mid, about two-thirds of its own length distant from it; halteres 

 with pale ochraceous stem and slightly fuscous knob. 



Length. 5 to 6 mm. 



Habitat. British Guiana (Dr. Low). 



Observations. Described from five $'s. They were taken in the bush on the 

 Pomeroon mission and on the Christianburg River. The species is very distinct and 

 can at once be told by the bristly basal antennal joint, its general dusky-brown ap- 

 pearance and markedly serrated ungues. One specimen shows the brown proboscis 

 very dark at the apex. It bears some resemblance to Gilesia aculeata, Theobald, 



Dr. Low tells me it is a common forest species widely distributed in virgin forest 

 in British Guiana. 



Description of Female of Aedes nubilus (Male and Larva Unknown) : 



Female. Proboscis moderate, siibcylindrieal, very slightly expanded at tip; 

 vestiture black; setae minute, curved, black, those on the labellee more promi- 

 nently outstanding. Palpi short, about one-fifth as long as the proboscis, 

 slightly enlarged at tip, clothed with black scales and rather long black 

 bristles. Antennae with the joints subequal, black, rugose, pilose, second joint 

 slightly stouter, yellow at base, somewhat bristly ; tori subspherical, with a cup- 

 shaped apical excavation, brownish yellow with a brown spot on inner side on 

 which there are a number of short setae; hairs of whorls rather long, sparse, 

 black. Eyes purplish-black. Clypeus short, elliptical, prominent, blackish 

 brown, nude. Occiput brown, clothed medianly with narrow, curved, sordid 

 whitish scales, a large quadrate patch of flat, dull black ones at the sides, the 

 cheeks and the margins of the eyes silvery white scaled ; many erect forked black 

 scales on the nape. 



Prothoracic lobes elliptical, remote dorsally, dark brovm, with a few pale 

 scales and black bristles. Mesonotum dark brown, uniformly clothed with nar- 

 row, curved, dark bronzy brown scales, a short row of silvery ones on either side 

 of the small antescutellar bare space. Scutellum trilobate, clothed with narrow, 

 shining white scales medianly, a few small black ones laterally, each lobe with a 

 group of black bristles. Postnotum elliptical, prominent, sordid ochraceous 

 brown, nude. Pleurae blackish brown, coxae luteous, with patches of flat white 

 scales and rows of short brown bristles. 



Abdomen subcylindrical, flattened, the posterior segments tapered; dorsal 

 vestiture dull black without luster, somewhat brownish in the centers of the 

 segments, a series of white, triangular lateral patches at bases of segments, 

 larger posteriorly and dorsally visible on segments 5, 6 and 7; first segment 

 black scaled and with many pale setae ; venter yellowish white scaled, with nar- 

 row, apical, black segmental bands, faint in some specimens. Cerci black. 



Wings rather broad, hyaline, faintly infuscated; petiole of second marginal 

 cell about half as long as its cell, that of second posterior shorter than its cell ; 

 basal cross-vein about its own length distant from anterior cross- vein ; vestiture 

 dark brown, the outstanding scales narrowly ligulate. Halteres whitish, with 

 black knobs. 



