782 MOSQUITOES OF NORTH AMERICA 



Description of Female, Male, Larva and Egg of Aedes infirmatus: 



Female. Proboscis moderate, subcylindrical, -uniform; labellse conically 

 tapered ; vestitiire black ; setae curved, minute, black, those on the labellse more 

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

 vestiture black, with sparse bristly setae. Antennae filiform, the joints subequal, 

 distal ones slightly longer, rugose, blackish, pilose; second joint but slightly 

 thickened, pale at base ; tori subspherical, with a cup-shaped apical excavation, 

 pale yellow, brownish-black on inner side; hairs of whorls sparse, rather long, 

 black. Clypens rounded triangular, convex, with a slight median groove, black, 

 nnde. Eyes black. Occiput dark brown ; vestiture of narrow scales on the 

 vertex, broad ones on the sides, silvery-white in the middle and along margins 

 of eyes, blackish-brown laterally; many npright, broad, pale scales on the nape; 

 setae along margins of eyes black, those projecting between eyes pale. 



Prothoracic lobes elliptical, remote dorsally, dark brown, similarly colored 

 to sides of mesonotum, with small bronzy-brown scales and dark setge. Meso- 

 notum dark brown, clothed with narrow curved scales, silvery-white in a broad 

 median stripe from anterior edge to posterior fourth, deep bronzy-brown on sides 

 of disk and behind, paler about the antescutella.r space. Scutelhim trilobate, 

 clothed with silveiy scales, each lobe with a group of brownish-black bristles. 

 Postnotum elliptical, prominent, brown, nude. Pleura? and coxaa pale, clothed 

 with patches of elliptical, flat white scales and rows of pale setae. 



Abdomen subcylindrical, tapering posteriorly; dorsal vestiture of brownish 

 black scales with a slight blue reflection, with lateral, basal, segmental, tri- 

 angular white patches ; first segment with a patch of dark scales and many fine 

 pale hairs; venter wholly whitish scaled. Cerci black. 



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

 as its cell, that of second posterior cell somewhat shorter than its cell; basal 

 cross-vein less than its own length distant from anterior cross-vein; scales 

 wholly brownish-black, outstanding ones narrowly ligulate, denser and slightly 

 broader towards tip of wing. Halteres whitish, with dark knobs. 



Legs slender, moderately long; vestiture dull bronzy-brown with a bluish 

 reflection ; femora pale whitish beneath nearly to their apices. Claw formula, 

 1.1-1.1-1.1. 



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



Male. Proboscis moderately long and slender, straight, black scaled. Palpi 

 exceeding the proboscis by nearly the length of the last joint, uniformly dark 

 brown scaled ; end of long joint and the last two joints slightly swollen and with 

 numerous long black hairs. Antennae plumose, the last two joints long and 

 slender, rugose, pilose, black, the others short, narrowly black-ringed at in- 

 sertions of hair-whorls, pale beyond ; hairs long, dense, black shading to brown. 

 Coloration similar to the female. Abdomen elongate, depressed; lateral cilia- 

 tion abundant, fine, pale ; lateral segmental spots large, tending to form narrow 

 basal bands dorsally; eighth segment white scaled above. Wings somewhat 

 narrower than in the female, the stems of the fork-cells much longer, the 

 vestiture sparse. Claw formula, 2.1-2.1-1.1. 



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



Genitalia (plate 29, fig. 200) : Side-pieces over twice as long as wide, 

 rounded at tip ; apical lobe small, continued narrowly two-thirds to base ; basal 

 lobe small, obtusely rounded, densely setose, with a long stout spine within. 

 Clasp-filament slender, slightly swollen medianly, with a long articulated 

 terminal spine. Harpes elliptical, concave, inner margin thickened and revo- 

 lute, tip pointed and recurved. Harpagones with a slender columnar base bent 

 at outer third, minutely pilose ; a long articulated terminal filament, narrowly 



