818 MOSQUITOES OF NORTH AMERICA 



Male. — Proboscis straight, long and slender, bronzy-black scaled. Palpi 

 nearly as long as the proboscis ; end of long joint and last two joints slender, 

 but slightly thickened and with the hairs moderate, rather sparse, black ; vesti- 

 ture bronzy-black. Antennae plumose, the last two joints long and slender, 

 rugose, pilose, black, the others short, sordid-luteous, ringed with black at 

 insertions of hair-whorls ; hairs of whorls long, abundant, dark brown. Colora- 

 tion similar to the female. Occiput entirely silvery-white scaled. Mesonotum 

 completely overspread with silvery white, except at posterior end where there are 

 traces of brown scales. Abdomen elongate, depressed, with a median dorsal 

 ridge which fades out posteriorly ; lateral silvery-white spots of fifth, sixth and 

 seventh segments on dorsal surface; eighth segment dorsaUy silver-sealed; 

 lateral ciliation rather short, coarse, pale. Wings narrower than in the female, 

 the stems of the fork-cells longer, the vestiture less abundant. Claw formula, 

 2.1-2.1-0.0. 



Length : Body about 5 mm. ; wing 4 mm. 



Genitalia (plate 33, fig. 231) : Side-pieces over twice as long as wide, rounded 

 at tips, apical lobe absent, basal lobe a rounded area bearing numerous setae 

 with tubercular bases. Clasp-filament small, slender, with an articulated 

 terminal spine half as long as the filament. Harpes elliptical, concave, inner 

 margin revolute, tip pointed and recurved. Harpagones with a short columnar 

 base bearing a long fine seta near tip and a terminal articulated long narrowly 

 ligulate filament. Unci approximate, revolute, forming a large basal cylinder. 

 Basal appendages very short, bearing three rather long spines. 



Larva, Stage IV (plate 119, fig. 409). — Head rounded, widest through eyes, 

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

 tennae moderate, slender, with a few small spines and a single hair before middle; 

 a long and a short subapical spine, two moderate apical ones and a digit on a 

 pedicel. Both pairs of dorsal head-hairs double, ante-antennal tuft multiple. 

 Mental plate triangular, with a. central tooth and ten on each side, the two basal 

 ones small and remote. Mandible quadrangular, with a few spines at base; 

 two filaments before tip ; an outer row of cilia from a collar ; a row of filaments 

 on outer margin and a row of fine obscure hairs from coincident bases ; dentition 

 of four teeth on a long process, first and third slightly longer; a long spine and 

 a short one before, a broad filament and a row of serrate hairs within ; process 

 below widely furcate, with a row of hairs down the middle extending below the 

 dentition and a tuft at the tip of each limb; basal angle moderate, with a row 

 of stout hairs within ; a row of hairs at base. Maxilla elliptical, divided by a 

 suture ; inner half roundedly protuberant, with a double row of teeth on margin, 

 long at apex and diminishing at base, a large patch of hairs within and a row 

 of cilia near the suture, a row of long hairs at tip ; outer half with two articu- 

 lated filaments near middle, a small spine at apex and a few hairs toward base of 

 palpus; palpus short and stout, with four rudimentary apical digits. Thorax 

 rounded, wider than long. Abdomen moderate, the anterior segments shorter; 

 lateral hairs in fives on first segment, in threes on second, in twos on third to 

 sixth; subdorsal and ventral hairs in stellate tufts. Air-tube stout, tapered, 

 about three times as long as wide; pecten reaching to the middle, the single 

 tooth a long spine with a stout basal branch and one or two short serrations; 

 a single small tuft of about five hairs beyond the pecten. Lateral comb of 

 eighth segment of many scales in a triangular patch; single scale elongate, 

 blunt, evenly fringed with spinules. Anal segment longer than wide, with a 

 dorsal plate reaching well down the sides, shallqwly emarginate on lateral 

 margin ; dorsal tuft a long hair and brush on each side ; a lateral tuft of five 

 long hairs ; ventral brush well developed, with a few tufts preceding the barred 

 area; anal gills about as long as the segment, roundedly tapered. 



