132 MOSQUITOES OF NORTH AMERICA 



Wings rather narrow, hyaline ; petiole of second marginal cell less than 

 one-half as long as its cell, that of second posterior cell about equal to its cell ; 

 basal cross- vein almost incident with anterior cross-vein; scales of veins nar- 

 rowly ovate, black, with blue reflection on the costa, broader and dense on 

 second to fourth veins, mostly with obliquely subtruncate tips. Halteres whitish 

 with black knobs. 



Legs rather long and slender, black with bronzy and blue reflection, the femora 

 whitish beneath at base, tibiae and tarsi with a bright bronzy luster beneath. 

 Claw formula, 0.0-0.0-0.0. 



Length: Body about 3.5 mm,; wing 3 mm. 



Male. Palpi slender and shorter than in the female, about one-seventh the 

 length of proboscis. Antenna similar to those of the female, the joints -wath 

 small secondary subapical whorls, the hairs of the basal whorls longer and 

 more abundant than in the female. Coloration as in the female. Abdomen 

 elongate, subcylindrical, somewhat expanded apically, with numerous terminal 

 coarse dark-brown bristles. Wings with the stems of the fork-cells longer than 

 in the female, the basal cross-vein about half its length from the anterior cross- 

 vein. Middle legs with the tarsi arcuated outwardly ; tarsi without white mark- 

 ings ; middle tarsi with a single claw, those of the hind tarsi slightly unequal ; 

 formula, 0.0-0-0.0. 



Length : Body about 3.5 mm. ; wing 2.7 mm. 



Genitalia (plate 3, fig. 13) : Side-pieces over twice as long as wide, slender, 

 the tips conically tapered; a single seta on outer aspect and three long ones 

 in a row towards base. Clasp-filament with a slender stem, the tip branching 

 into three lobes ; outer lobe erect, serrate, with a long crest at the tip ; middle lobe 

 upright, smooth ; inner lobe elliptical, projecting at right angles, bearing a row 

 of long hairs outwardly. Basal lobes of side-pieces small, rounded, triangular, 

 setose. Harpes slender, tips approximate, obscurely dentate, the pair forming 

 a large basal cone. Harpagones and unci forming two similar smaller cones. 

 Basal appendages represented by a row of five setaj on each side. Penultimate 

 segment with a rounded hairy prominence at each lateral angle and a smaller 

 prominence ^vithin it, also hairy. 



Larva, Stage IV (plate 91, fig. 293) . Head rounded, angles slight. Antennae 

 small, cylindrical, smooth, without perceptible hair; a slender spine and three 

 short ones and a digit on a long, slender pedestal at tip. Eyes small, round. 

 Head hairs slight. Mental plate broadly arcuate from an excavate triangular 

 base ; a stout central tooth and nine on each side, all very regular and even, the 

 last one a little more pointed and separated. Mandible quadrangular, slightly 

 spined at the base outwardly; a very long hair from a tubercle basad of the 

 middle ; two long filaments and a short one before tip ; an outer row of cilia from 

 a collar ; a short row of branched filaments on outer margin ; dentition of four 

 teeth on a long process, the first the longest; a spine before, two small teeth 

 at base, a narrow filament and row of hairs within ; process below long, thick, 

 continuous with the basal angle, slightly widely furcate without, a row of hairs 

 along outer margin ; a row of stout divided hairs within ; a row of long hairs at 

 base. Maxilla hemispherical, base oblique, no suture; a series of stout curved 

 spines along inner margin, inner half of surface covered with long converging 

 hairs; a round tuft of hairs at tip, with a stout spine \\dth furcate apex on the 

 inner side ; a long spine below ; two little processes at middle of outer margin. 

 Palpus small, stout, with minute apical digits. Thorax rounded, abdomen 

 slender, the hairs well developed. Air-tube moderate, about three times as long 

 as wide, conically tapered outwardly, a few scattered hairs, mostly single; no 

 pecten, a broad black basal ring. Lateral comb of eighth segment of thirteen 

 or less smooth, thorn-shaped scales in a straight row, preceded by an elongate 

 irregularly elliptical plate. Anal segment about as wide as long, with a dorsal 



