518 MOSQUITOES OF NORTH AMERICA 



subtruncate, covering the lower ones, which are lanceolate; fringe dusky. 

 Halteres with the knobs dark scaled. 



Legs dusky scaled with a sprinkling of yellowish scales ; femora and tibiae with 

 numerous scattered yellowish scales and without pale rings or apical spots ; tarsi 

 of front and middle legs dorsally white marked at bases of second, third, and 

 fourth segments; hind tarsi with all but first segment basally white-ringed, 

 the rings narrowed beneath. Claw formula, 0.0-0.0-0.0. 



Length : Body about 3.5 to 5 mm. ; wing 3 to 4.5 mm. 



Male. Proboscis moderately long, straight, slightly swollen apically; vesti- 

 ture of brown scales with yellow ones intermixed, without pale ring. Palpi 

 very long, exceeding the proboscis by more than the length of the last joint; 

 long joint about three-fourths the length of proboscis, slender, the apical third 

 dilated ; last two segments stout, the last slightly longer, blunt at tip ; vestiture 

 of dusky scales with yellow ones intermixed, the constriction below middle of 

 long joint pale, bases of last two joints narrowly silver scaled ; apex of long joint 

 and last two joints with a dense mass of very long brown hairs. Antennae 

 densely plumose ; last two joints long, slender, rugose, pilose, brown, the others 

 short, pale, with dark rings at insertions of hair- whorls; hairs of whorls long, 

 brown with yellowish silky luster; tori large, deep brown, with whitish scales. 

 Clypeus large and prominent. Occiput with yellowish, narrow recumbent scales 

 and numerous black, erect, forked ones ; sides of head white scaled. Coloration 

 similar to the female. Abdomen long, depressed towards apex, nearly straight 

 sided; lateral ciliation coarse, abundant, long, dark brown. Wings rather 

 narrow, vestiture sparser than in the female ; second marginal cell considerably 

 longer than its petiole ; base of second posterior cell nearer the base of the wing 

 than the second marginal cell ; basal cross- vein more than its own length from 

 anterior cross-vein. Knobs of halteres dark, with dusky scales. Claw formula, 

 2.0-2.0-0.0. 



Length : Body about 4.5 mm. ; wing 3.5 mm. 



Genitalia (plate 34, fig. 228) : Side-pieces about three times as long as wide, 

 narrowed a little at middle, without lobes ; clasp-filament very stout tapering to 

 tip, a slender branch at basal fourth, a short, stout, inserted terminal spine. 

 Harpes elliptical, with strongly revolute inner margins, tips bent over and 

 serrated. Basal lobe of side-piece represented by a long rounded process, 

 attenuated centrally, lying upon the side-piece and reaching well toward its tip, 

 bearing two inserted terminal stout spines. Unci forming a short basal cylinder. 



Larva, Stage IV (plate 128, fig. 446). Head flat, quadrate, transverse; the 

 eyes on a rounded, slight prominence near the posterior angles ; anterior division 

 of eye narrow, transverse, curving around from upper to under surface ; posterior 

 division small, rounded, covered by a curved stout transparent spine ; front of 

 head partly rounded, prominent; clypeus emarginate, with a stout articulated 

 spine on each side of the emargination ; a tuft of fine radiating hairs arises be- 

 neath the middle ; a large hair-tuft near base of antenna, the other head-hairs 

 rudimentary. Antennae large, broadly inserted, a broad, stout tooth beneath the 

 insertion; shaft long, nearly uniform from base to terminal process, with a long 

 tuft of hairs near the middle of that portion ; half of the terminal region is pro- 

 duced as a long slender rod, as long as the rest of the antenna and doubling its 

 length, which thus considerably exceeds the width of the head ; two small proc- 

 esses are borne on the tip of the rod, the other two are long hairs. Mouth- 

 brushes long, fine, moderate. Mental plate small. Thorax and abdomen normal, 

 the abdominal segments uniform ; hairs small, the long lateral ones single ; each 

 segment has a small dorsal chitinization and a broad ventral band weakly 

 chitinized, extending each side in a rounded point covering the origin of the sub- 



