1012 MOSQUITOES OF NORTH AMERICA 



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 tibiae 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 setae, 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. Air-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. 



