AEDES ATLANTICUS 801 



rower than in the female, the stalks of the fork-cells longer, the A^estiture less 

 abundant. Claw formula, 2.1-2.1-1.1. 



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



Genitalia (plate 28, fig. 192) : Side-pieces three times as long as wide, 

 conically tapered; apical lobe slender, prominent, conical, basal lobe broadly 

 expanded, three times as wide as long, setose, with a stout spine within. Clasp- 

 filament slender, slightly expanded in the middle, with a long terminal articu- 

 lated spine. Harpes narrowly elliptical, concave, inner margin thickened, 

 revolute, tip pointed, outcurved. Harpagones with a very stout bent columnar 

 stem, finely pilose and with a terminal filament, which is broadly expanded 

 medianly, the tip bluntly rounded. Unci approximate, revolute, forming a small 

 basal cylinder. Basal appendages approximate, short, bearing five short spines. 



Larva, Stage IV (plate 126, fig. 437). Head rounded, widest through eyes, 

 narrowed before, a notch at insertion of antennae, front margin arcuate. An- 

 tenna?, moderate, slender, sparsely spined, a small tuft towards middle; three 

 short irregular spines and a stout digit at tip. Both pairs of dorsal head-hairs 

 single, ante-antennal tuft multiple. Mental plate elongate triangular, with a 

 small central tooth and sixteen on each side, basal ones progressively stouter 

 and more remote. Mandible rounded quadrangular, with an area of short 

 spines outwardly near base ; a long filament and a short one from a notch before 

 tip ; an outer row of cilia from a collar ; a row of long filaments on outer margin 

 and a row of fine slender hairs with coincident bases; dentition of four teeth 

 on a process, first and fourth slightly longer; two spines before, two short double 

 teeth at base, a broad filament and a row of feathered hairs within ; process 

 below furcate, with a row of hairs on outer margin and a tuft at tip of each 

 limb ; basal angle moderate, a row of sparse coarse hairs within ; a row at base. 

 Maxilla irregularly hemispherical, divided by a suture; inner half with a row 

 of stout filaments with divided tips on the margin, a row of stout hairs within 

 and a row of cilia near the suture ; inner half with two filaments near apex, a 

 long spine near apical hair-tuft, a short spine on margin and sparsely dis- 

 tributed hairs over the surface; palpus short and stout, rounded, with four 

 rudimentary apical digits. Thorax rounded, wider than long. Abdomen 

 moderate, anterior segments shorter ; lateral hairs in threes on first segment, in 

 twos on second, single on third to sixth. Air- tube stout, slightly tapered on 

 outer half, two and a half times as long as wide; pecten running to middle, of 

 few teeth, followed by an ample tuft; single pecten-tooth a long spine with 

 three basal branches. Lateral comb of eighth segment of six large thorn-shaped 

 scales in a row; single scale with large central spine and short basal spinules. 

 Anal segment as long as wide, ringed by the plate ; dorsal tuft a long hair and 

 brush on each side; ventral brush well developed, confined to the barred area; 

 anal gills regularly tapered, lower pair as long as segment, upper pair longer. 



The larvffi inhabit temporary ground-pools. Dr. Dyar found them in a semi- 

 permanent marshy pool, containing leaves of small water-plants, but joined to a 

 railroad ditch. They were associated with Psorophora floridense and P. ciliata. 

 Professor Smith found the larvae in woodland pools with Aedes canadensis and 

 A. sylvestris. He found the adults in low swampy woods, from which they did 

 not emerge, and only bit when their haunts were invaded. Larvae appear at 

 intervals during the season, and the eggs undoubtedly hibernate. 



Southern Atlantic States. 



New Brunswick, New Jersey, August 1 (through J. B. Smith) ; Sanford, 

 Florida, March 17, 1905 (H. G. Dyar) . Reported also from Staten Island, New 

 York (Felt). 



Aedes atlanticus takes the place of Aedes tormentor upon the Atlantic coast, 

 but both species occur in Florida. As remarked in the discussion of A. tor- 



