756 MOSQUITOES OF NORTH AMERICA 



Description of Female, Male, and Labva of Aedes impiger: 



Female. Proboscis moderately long, subcylindrical, uniform; labelte coni- 

 cally tapered; vestiture black with slight bronzy luster; setae minute, curved, 

 black, those on labellae more prominently outstanding. Palpi short, less than 

 one-fifth as long as proboscis ; vestiture black with some white scales intermixed ; 

 setae moderate, bristly, black. Antennae filiform, the joints subequal, rugose, 

 pilose ; second joint somewhat enlarged, brown, pale at base ; tori subspherical, 

 with a cup-shaped apical excavation, luteous brown, with a patch of small brown 

 sets on inner side ; hairs of whorls moderate, sparse, black, Clypeus roundedly 

 triangular, prominent, nude, black. Eyes black. Occiput black, with narrow, 

 curved, pale-ocherous scales on vertex, broad, flat, dull whitish ones on the sides; 

 many short, erect, forked yellowish scales on the nape ; setae along margins of 

 eyes black, those projecting forward between the eyes pale. 



Prothoracic lobes elliptical, remote dorsally, black, clothed with narrow 

 curved yellowish-white scales and black bristles. Mesonotum black, clothed with 

 narrow, curved, pale bronzy-brown scales which are divided medianly by two 

 longitudinal narrow stripes in which the ground-color prevails and the scales 

 are smaller and slightly darker ; scales surrounding antescutellar space lighter ; 

 bristles numerous, moderate, black. Scutellum trilobate, black, clothed with 

 pale ocherous scales, each lobe with a group of pale bristles. Postnotum ellipti- 

 cal, prominent, brown, slightly pruinose. Pleuras brown, coxae luteous, clothed 

 with narrow golden-brown scales above, elliptical, flat, white ones below, and 

 with rows of pale bristles. 



Abdomen subcylindrical, flattened, tapering posteriorly; dorsal vestiture of 

 black scales, each segment with a rather broad basal white band which widens 

 somewhat laterally; first segment with dull white scales and with many long 

 pale hairs ; venter largely sordid white scaled. Cerci black. 



Wings rather long, hyaline ; petiole of second marginal cell a little shorter 

 than its cell, that of second posterior cell about equal to its cell ; basal cross-vein 

 about its own length distant from anterior cross-vein; scales blackish brown, 

 outstanding scales broadly linear. Halteres pale, with whitish knobs. 



Legs moderately long and slender; femora largely black scaled above, yellow- 

 ish-white below, a black ring close to apex ; knees white ; tibiae with dull yellow- 

 ish-white and bro"\vnish-black scales intermixed, the pale scales predominating 

 on under sides; tarsi brownish black scaled, the first joint largely pale scaled 

 beneath, the black scales increasing outwardly, terminal joints wholly black. 

 Claw formula, 1.1-1.1-1.1. 



Length : Body about 5.5 mm. ; wing 5 mm. 



Male. Proboscis long, slender, straight, black. Palpi exceeding the proboscis 

 by about the length of the last joint; vestiture of dull bronzy-black scales ; end of 

 long joint and last two joints slightly enlarged, with abundant, long black hairs. 

 Antennae plumose, the last two joints long, slender, rugose, pilose, black, the 

 others short, brown, with black rings ; hairs of whorls very long, brown with silky 

 luster. Coloration similar to the female. Abdomen elongate, depressed, the seg- 

 mental white bands broader than in the female ; lateral ciliation long, fine and 

 abundant, pale brownish. Wings narrower than in the female, the stems of the 

 fork-cells longer, the vestiture sparse. Claw formula, 1.1-1.1-1.1. 



Length : Body about 6 mm. ; wing 5 mm. 



Genitalia (plate 21, fig. 168) : Side-pieces nearly three times as long as wide, 

 rounded at tip ; apical lobe roundedly prominent, without basal continuation ; 

 basal lobe digitate, appressed, with a side-piece bearing two stout apical setae. 

 Clasp-filament long, swollen in middle, with four small seta towards tip, a long 

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



