800 MOSQUITOES OF NORTH AMERICA 



The following is an abstract of the table : 



1. Air tube with the tuft beyond the pecten 8 



8. Pecten of the air tube with evenly spaced teeth 13 



13. Comb scales few, in a single or irregularly single row 14 



14. Anal segment ringed by the plate 15 



15. Anal processes moderate, normal 16 



16. Comb of six scales; pecten not reaching half of tube 17 



17. Pecten of air tube running about one-half; anal segment longer 



than wide atlantieus 



Dbsceiption or Female, Male, and Laeva of Aedes atlantictjs : 



Female. — Proboscis rather short, subcylindrical, uniform; labellse conically 

 tapered; vestiture dark brown; setae minute, curved, black, those on labellae 

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

 vestiture dark brown, setse moderate. Antennae filiform, the joints subequal, 

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

 tori subspherical, with a cup-shaped apical excavation, yellowish shading to 

 brown within, with a patch of fine setae ; hairs of whorls sparse, moderate, black. 

 Clypeus rounded triangular, convex, medianly depressed, dark brown, nude. 

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

 on the vertex, broad flat ones on the sides, silvery white on vertex and along 

 margins of eyes, black on the sides, white below, many erect, forked dark scales 

 on the nape; bristles along margins of eyes dark brown, those projecting between 

 eyes whitish. 



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

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

 with narrow curved scales, a rather broad silvery white median stripe from the 

 anterior edge and continued over the antescutellar space to the posterior 

 margin, the rest of the vestiture dark brown; bristles over roots of wings and 

 about antescutellar space dark brown. Scutellum trilobate, the mid lobe with 

 silvery-white scales, each lobe with a group of dark brown bristles. Postnotum 

 elliptical, prominent, brownish luteous, nude. Pleurae and coxae yellowish, 

 clothed witii patches of elliptical, flat, white scales and pale bristles. 



Abdomen subcylindrical, flattened, tapering posteriorly; dorsal vestiture of 

 dull blue-black scales, bristles on posterior borders of segments yellowish, a row 

 of large segmental, lateral, basal, triangular white spots ; venter yellowish-white 

 sealed, with black scales along posterior margins of last three 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, the out- 

 standing ones narrowly ligulate, denser on forks of second vein. Halteres pale, 

 with blackish knobs. 



Legs slender, moderately long; vestiture brownish-black; under sides of 

 femora yellowish white except at tips; tibiae pale beneath, bronzy. Claw 

 formula, 1.1-1.1-1.1. 



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



Male. — Proboscis longer than in the female, straight, deep bronzy-brown 

 scaled. Palpi exceeding the proboscis by the length of the last joint ; end of long 

 joint and last two joints considerably swollen and with dense, long brown hairs ; 

 vestiture deep bronzy-brown throughout. Antennae plumose, the last two joints 

 slender, rugose, pilose, black, the others short, pale, narrowly black ringed at 

 insertions of hair-whorls; hairs long, dense, black with brown luster; tori en- 

 tirely blackish. Coloration similar to the female. Abdomen elongate, depressed, 

 with rather irregular, long and fine, pale yellow lateral ciliation. Wings nar- 



