1012 :mosquitoes of xorth ainierica 



scales at outer third of costa involving first and second veins, a small patch 

 involving the same veins close to apex of wing, a small patch of pale scales on 

 each branch of second vein; fourth vein with two pale spots on stem and one 

 on each fork ; sixth vein with a long patch of pale scales in the middle. Halteres 

 whitish, with brown knobs. 



Legs long and slender; brownish-black, tips of femora and tibias narrowly 

 whitish. Claw formula, 0.0-0.0-0.0. 



Length : Body about 5 mm. ; wing 4.5 mm. 



Male. Proboscis slender, straight, black-scaled. Palpi slightly longer than 

 the proboscis ; last two joints short, swollen, club-shaped, with dense, long brown- 

 ish hairs ; vestiture dark throughout. Antennae plumose ; last two joints long 

 and slender, rugose, pilose, black, the others shorter, subequal, pale, with black 

 basal rings ; hairs of whorls long, dense, brown, with silky luster. Coloration as 

 in the female. Abdomen long, depressed, somewhat narrowed near base, gray 

 pruinose ; lateral ciliation long and abundant, pale yellowish. Wings narrower 

 than in the female, the stems of the fork-cells longer, the vestiture sparser. 

 Claw formula, 2-0.0-0.0. 



Length : Body about 5 mm. ; wing 4.5 mm. 



Genitalia (plate 40, fig. 268) : Side-pieces about twice as long as wide, 

 conical, bearing a long stout spine at middle of inner margin, at base a pair of 

 stout spines inserted on low tubercles, a pair of unequal spines arising from a 

 detached conical piece. Clasp-filament longer than side-piece, slender, slightly 

 enlarged at base and apex, with a small and stout articulated terminal spine. 

 Basal appendages large, leaf-like. Unci slender, columnar, bearing two tufts 

 of long spines which project at right angles. 



Larva, Stage IV (see the figure of the entire larva, plate 84). Head 

 rounded, elongate, longer than wide, bulging at sides, front conically produced ; 

 both pairs of dorsal head-hairs single but numerously branched, in a line between 

 antennae, a smaller hair at base of antennae ; two long approximate setae on the 

 front margin. Antennae subcylindrical, slightly tapered, spined on one side; 

 a tuft of four hairs at basal third ; two long dentate articulated terminal 

 processes, one short one and a small hair-tuft. Eyes large, pointed. Mental 

 plate small, narrow, with a median tooth and four on each side, first and second 

 subequal, well spaced, third distant, fourth small. Mandible quadrangular, 

 convex without; seven large branched hairs on dorsal aspect in a group, two 

 smaller ones near them; two pairs of flat appendages near tip; an outer row 

 of cilia ; terminal dentition of twelve teeth, the upper three projected, bearing 

 the fourth, fifth, and sixth on the lower declivity; two filaments above, three 

 large ones within, a square finely dentate process below ; a thick process at end 

 of dentition, another at base, between these a dense row of setfe, the central ones 

 longest. Maxilla rounded rectangular, palpus attached by a narrow constric- 

 tion ; numerous short setae and spines on inner aspect ; palpus with round pro- 

 jecting base, dendritic tuft without, terminally five digits and two flattened 

 appendages. Thorax rounded quadrate, about as long as wide; hairs short, 

 consisting of branched hairs, single hairs and tufts, the mesothorax sparsely 

 haired. Abdomen stout, anterior segments shorter ; long, feathered lateral 

 hairs on the first three segments, double on the first and second, single on third ; 

 posterior hairs small, smooth ; a dorsal series of six pairs of fan-shaped tufts on 

 second to seventh segments (plate 130, fig. 451), the first pair small, the others 

 well developed ; elements of tufts bluntly notched towards tips. x\ir-tube sessile, 

 subquadrate, roundedly angled posteriorly. Lateral plates of eighth segment 

 posteriorly with a series of spines, longer and shorter ones irregularly arranged. 

 Anal segment about as long as wide, with a small dorsal plate ; dorsal brush a 

 long and a short tuft on each side ; a single long lateral hair below plate ; ven- 

 tral brush well developed, of long branched tufts ; anal gills moderate, about as 

 long as the segment, bluntly pointed. 



