312 MOSQUITOES or NORTH AMERICA 



Male. — Proboscis long and straight, slightly enlarged towards apex, black 

 scaled. Palpi slender, exceeding proboscis by nearly the length of last two 

 joints, tip of long joint and the last two joints with mimerous long black hairs, 

 slightly enlarged ; vestiture of black scales, with bronzy and blue luster, without 

 rings. Antennae plumose ; last two joints long and slender, rugose, pilose, black, 

 the others short, whitish, with black rings at insertions of hair-whorls, hairs 

 long, dense, black. Coloration similar to the female. Wings hardly narrower, 

 the stems of the fork-cells slightly longer, vestiture nearly tie same. Abdomen 

 long, somewhat enlarged apically, ends of segments witii long hairs, tip with 

 numerous coarse bristies, lateral ciliation coarse, sparse, rather short, the seg- 

 mental basal lateral white spots larger than in the female and narrowly united 

 dorsally on some of segments. Claw formula, 1.1-1.1-0.0. 



Length : Body about 2.5 mm. ; wings 2.5 mm. 



Genitalia (plate 11, fig. 78) : Side-pieces over twice as long as wide, tips 

 rather sharply conically tapered ; prominences on inner side divided into three 

 portions, arising close together; outer brajich slender, bearing a rod with hooked 

 tip, a narrow leaf -like appendage and five setae ; central branch not as long as 

 outer one, bearing a single long, stout filament with hooked tip ; third branch 

 still shorter and bearing an appendage similar to that of the middle branch. 

 Clasp-filament stout, attenuated in middle, tip expanded, divided by a groove, 

 bearing a small terminal spine, outer aspect roughened with coarse denticles. 

 Harpes with outer branch represented by an angle only, inner one long, slender, 

 ending in comb of evenly spaced teeth. Harpagones lamellate, scarcely divided, 

 extending in a curved broad plate with slightly revolute edges and emarginate 

 tip. Basal lobes rounded, thick, setose. 



Larva, Stage lY (plate 108, fig. 362) . — Head rounded, broad, widest through 

 eyes, much wider than long; antennae large, prominent, a large tuft beyond 

 middle, the part of shaft beyond this more slender ; two of the terminal hairs 

 considerably removed from apex ; shaft spinose. Skin abundantly pilose ; lateral 

 abdominal hairs in threes on first segment, twos on second, fives on third, threes 

 on fourth to sixth. Lateral comb of eighth segment of rather few spines, two 

 rows deep. Air-tube rather slender, about six times as long as wide, very 

 slightly widened at extreme tip; terminal hooks large and curved, with median 

 tooth; pecten covering the basal two-fifths, the teetii short, evenly spaced; six 

 large multiple tufts on posterior line, the first well within pecten, the last far 

 before apex. Anal segment longer than wide, ringed by the plate, which is 

 spinose on its posterior border; dorsal tuft of three hairs of different lengths 

 on each side; ventral brush large, confined by the chitinous ring. Anal giUs 

 short, equal, considerably shorter than anal segment. 



The larvae live in ground-pools, often with algae. Mr. Jennings got them in a 

 ditch in open ground, in a small pool with algae beside a railroad track, and in a 

 swamp back of a dump. 



Panama. 



Ancon, Canal Zone, November 18, 1907 (A. H. Jennings) ; Cartagenita, 

 Paraiso District, Canal Zone, November 16, 1907 (A. H. Jennings) ; Mira- 

 flores. Canal Zone, December 10, 1907 (A. H. Jennings) ; Tabernilla, Canal 

 Zone, December 15, 1908 (A. H. Jennings). 



CULEX SPISSIPES (Theobald) Dyai & Enab. 



Melanoconion spissipes Theobald, Men. CuUc, iii, 242, 1903. 



Melanoconium spissipes Blanchard, Las Moustlques, 396, 1905. 



Melanoconion spissipes Coqulllett, U. S. Dept. Agr., Bur. Ent, Tech. ser. 11, 24, 1906. 



Melanoconion spissipes Peryassfl, Ob Culicid. do Brazil, 49, 238, 1908. 



Culex spissipes Dyar ft Knab, Proc. U. S. Nat Mus., xxxv, 58, 1908. 



Melanoconion spissipes Theobald, Mon. Culic, v, 457, 1910. 



