690 MOSQUITOES OF NOETH AMERICA 



tarsi the basal bands are narrow and nearly obsolete on the last joints. Claw 

 formula, 1.1-1.1-1.1. 



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



Male. — Proboscis slender, straight. Palpi exceeding the proboscis by about 

 the length of the last joint; end of long joint and the last two joints some- 

 what thickened and bearing many long dark brown hairs ; long joint clothed 

 with black scales and white ones intermixed, a broad white ring at middle 

 and near base ; last two joints with many white scales at their bases. Antennse 

 plumose, the last two joints long and slender, black, rugose, pilose, the others 

 short, largely pale; hairs of whorls long, dense, black with yellowish brown 

 luster. Coloration similar to the female. Wings narrower than in the female, 

 the stems of the fork-cells longer, vestiture sparse. Abdomen long, depressed, 

 the basal segmental bands broader; lateral ciliation long and abimdant, pale 

 yellow. Claw formula, 1.1-1.1-1.1. 



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



Genitalia (plate 35, figs. 171 and 172) : Side-pieces over twice as long as 

 wide, slender ; distal lobe roundedly prominent, continued along the inner mar- 

 gin narrowly to the basal lobe ; basal lobe quadrately expanded, bearing many 

 small setae with tubercular bases, but without a stout spine. Clasp-filament 

 slender, bearing a few small setse outwardly, at the tip a long articulated ter- 

 minal spine. Harpes slender, concave, the inner margins revolute, hooked at the 

 tip, the point directed outward. Harpagones with a slender cylindrical base, 

 curved, minutely pilose, bearing a terminal filament which is nearly as long as 

 the stem and angularly expanded at middle. Unci approximate, revolute, 

 forming an indistinct basal cylinder. Basal appendages stout and approximate, 

 bearing a row of stout setse at the tip. 



Larva, Stage IV (see the figure of the entire larva, plate 65). — Head broad, 

 rounded, wide behind, abruptly narrowed before eyes, slightly notched at inser- 

 tion of antennae, front margin broadly arcuate. Antennae subcylindrical, slender, 

 a little thickened near base, spined all over and with a fine serration along inner 

 side ; tuft before middle, moderate ; three short terminal spines, a longer one 

 and a short broad digit. Eyes large, transverse, pointed. Both pairs of dorsal 

 head-hairs double; ante-antennal tuft multiple. Mental plate triangular, an 

 apical tooth and twelve on each side, the upper seven rounded and closely set, 

 the rest pointed and more remote toward base, the last one small. Mandible 

 quadrangular, with a patch of spines near base; two filaments near tip with a 

 thorn-shaped basal process; an outer row of cilia from a collar; thirteen fila- 

 ments on outer edge, those next the collar smaller and feathered ; dentition of 

 four teeth on a process, the first largest, the third next so ; a filament before, a 

 tooth with basal notch at base, a broad filament within; process below rather 

 widely furcate, with large hair-tufts; basal angle blunt, seven scattered fila- 

 mentous hairs within ; a row at base. Maxilla elongate hemispherical, divided 

 by a suture; inner half long-haired, a large tuft at tip; outer half with a patch 

 of hair toward base, the filaments next the suture moderate ; palpus short, with 

 four small digits. Thorax rounded, wider than long; hairs abundant, rather 

 long, the subdorsal prothoracic ones single and as long as tlie head. Abdomen 

 moderate, anterior segments short, posterior ones narrow and elongate; hairs 

 rather long, the lateral ones triple on first two segments, single on third to sixth ; 

 a pair of long subventral hairs on third to fifth segments and long subdorsal ones 

 on fourth and fifth. Tracheal tubes rather narrow, but band-shaped, narrowed 

 posteriorly, not markedly angled except in the eighth segment. Air-tube rather 

 long and slender, stout at base, tapering from basal fourth outwardly, four or 

 more times as long as wide; pecten reaching less than halfway, the last two 

 teeth large and detached ; single spine long, with wide base and four to six basal 



