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 brown stripe on upper surface, which 

 is expanded at tip and there encircles the joint; knees yellowish white ; aU tibiae 

 entirely dark above, apex broadly yellow white, lower surface yeUow-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 basaUy, 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 plumosej 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, 2.1-2.1-0.0. 



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



Genitalia (plate 35, fig. 233) : Side-piece stout, somewhat elongate, rounded 

 at apex; basal lobe sUght, bearing two very stout approximate setse; apical lobe 

 represented by a stout setae 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 antennae, tiie front margin arcuate. Antennae small, subcylindrical, 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 



