480 MOSQUITOES OF NORTH AMERICA 



longer than second posterior cell and nearly twice as long as its stem. Halteres 

 brownish, the knobs darker. 



Legs long, slender ; fore and mid femora with a black stripe on upper surface, 

 which gradually broadens and at tip encircles the joint, at anterior fifth a 

 yellowish-white spot on inner side, outer side entirely yellowish white except at 

 tip ; hind femora yellowish white, a dark bro^vn stripe on upper surface, which 

 is expanded at tip and there encircles the joint; knees yellowish white; all tibise 

 entirely dark above, apex broadly yellow white, lower surface yellow-white 

 scaled; tarsi black, all three pairs with the first and second joints narrowly 

 yellow-white at bases, the third, fourth, and fifth joints with faintly indicated 

 pale basal rings. Claw formula, 0.0-0.0-0.0. 



Length ; Body about 4.5 to 6 mm. ; wing 5 to 6.5 mm. 



Male. Proboscis nearly straight, slightly thickened on distal half, labellae 

 more elongate and obtuse; vestiture pale on basal half below. Palpi long, 

 slightly exceeding the proboscis, slender basally, last joint club-shaped, apex of 

 long joint and last two joints clothed with long black hairs; vestiture black, 

 long joint whitish at base and broadly white ringed beyond middle; last two 

 joints white ringed at bases. Antennae densely plumose; last two joints long 

 and slender, rugose, pilose, black, the others short, slender, whitish, with black 

 rings at insertions of hair-whorls. Occiput with erect, forked scales of vertex 

 pale yellowish, those on the sides black. Abdomen long, slender, depressed, 

 broadened posteriorly, with abundant, fine pale lateral ciliation; venter with 

 apical dark segmental bands, last segment entirely dark scaled above. Wings 

 much narrower than in the female, the stems of the fork-cells longer ; vestiture 

 less abundant. Claw formula, 3.1-2.1-0.0. 



Length : Body about 5 to 6.5 mm, ; wing 4.5 to 5.5 mm. 



Genitalia (plate 35, fig. 232) : Side-piece stout, somewhat elongate, rounded 

 at apex; basal lobe slight, bearing two very stout approximate sets; apical lobe 

 represented by a stout setse and a group of small ones. Clasp-filament rather 

 slender, tapering gradually from slightly expanded base and bearing a small 

 apical articulated spine. Harpe elongate, slender, with apex slightly expanded, 

 divided into two major apical teeth and one or two smaller subapical ones. A 

 basal sensory lobe, oval or subglobular, crowned with numerous stout setae. 

 Harpago conical, thin, membranous. Unci approximate, convolute, ventral 

 margin broadly rounded and tapering to a truncate posterior edge. A short row 

 of about eight stout spines on ventral line of penultimate segment. 



Larva, Stage IV. Head rounded, narrowed before eyes, a notch at insertion 

 of antennas, the front margin arcuate. Antennae small, subeylindrical, sparsely 

 spined, swollen toward base ; a large hair-tuft a little before middle ; four sub- 

 equal terminal setae, one of which arises before tip ; a small digit. Eyes large, 

 pointed. Both pairs of dorsal head-tufts and ante-antennal tuft multiple. 

 Mental plate elongate-triangular, with a central tooth and twelve on each side, 

 the last one small and widely remote, followed by a still smaller basal notch. 

 Mandible quadrangular, elongate, the part beyond the collar especially promi- 

 nent; two stout and two feathered filaments before the collar, preceded by two 

 shorter feathered filaments ; a row of cilia from a collar ; twelve tufts of fila- 

 ments on outer margin, those next collar long and not more than double, outer 

 ones progressively shorter and tufted; dentition of four teeth, sessile, the first 

 longest; four slender teeth before; a row of small serrations at base, a serrate 

 filament and six feathered hairs within ; process below widely furcate, with hairs 

 on both forks ; basal angle slender and incurved ; a group of hairs within ; a row 

 of long hairs at base. Maxilla irregularly hemispherical, divided by a suture 

 which runs inwardly, the inner part being nearly parallel to base; inner half 

 hairy toward margin, with a group of hairs near angle of suture ; a rather short 



