926 MOSQUITOES OF NORTH AMERICA 



hairs and a median one of small hairs. Coloration as in the female. Abdomen 

 subcylindrical, more elongate than in the female, with many coarse yellowish 

 bristles distally. Wings narrower than in the female, the stems of fork-cells 

 longer, vestiture about the same. Claw formula, 0.0-0.0-0.0; one claw of the 

 mid legs very large, the other minute, setiform. 



Length : Body about 2 mm. ; wing 2 mm. 



Genitalia (plate 38, fig. 254) : Side-pieces about twice as long as wide, 

 conically tapered, basal lobe small, setose. Clasp-filament nearly as long as the 

 side-piece, stout, thickened above the middle, with a minute terminal claw. 

 False harpes slender, concave, margins slightly recurved, tip pointed. False 

 harpagones with a broad triangular base, shaft slender, recurved, divided into 

 a number of slender lamellae. 



Larva, Stage IV. Head elongate, elliptical, bulging at eyes, front arcuate; 

 clypeus medianly emarginate and with a pair of stout prominent spines; an- 

 tennae small and stout, with coarse spines, a single hair near base; both pairs 

 of dorsal head-hairs single, stout, spine-like; ante-antennal tufts multiple. 

 Lateral hairs of first and second abdominal segments long and stout, on succeed- 

 ing segments fine, short and multiple ; subdorsal hairs in ample tufts. Air-tube 

 subcylindrical, about five times as long as wide, slightly tapered ; pecten of 

 about sixteen rather long, sharp, evenly spaced teeth reaching nearly to middle, 

 closely followed by a large multiple tuft. Lateral plate of eighth segment large, 

 with comb of eleven or twelve stout sharp teeth along posterior margin. Anal 

 segment with a chitinous ring, spinose along its posterior border; dorsal tufts 

 of five long hairs on each side; lateral tuft small, multiple; ventral brush long 

 but of few hairs, confined to barred area; anal gills four, equal, moderate, not 

 as long as anal segment, pointed. 



Mr. Jennings found the larvae in a still pool in a small stream and in holes 

 along this stream, which were more or less open crevices under rocks, inhabited 

 by crabs, about a quarter of a mile from the beach, at a good elevation. The 

 adult mosquitoes were hiding in large crevices among the rocks in the immediate 

 vicinity of the holes. The water was fresh. 



Panama. 



Taboga Island, Panama Bay, April 27, 1908 (A. H. Jennings) ; Caldera 

 Island, Porto Bello Bay, January 3, 1908 (A. H. Jennings). 



A good series of UranotcBnia typhlosomata before us shows that the imaginal 

 coloration is constant and agrees with the type ; there are no bluish scales on the 

 disk of the mesonotum. 



URANOTJENIA ANHYDOR Dyar, 



Uranotwnia anhydor Dyar, Proc. U. S. Nat. Mus., xxxii, 128, 1907. 



Original Description of Uranot^nia anthdor: 



A single larva was collected in a swamp full of reeds at Sweetwater Junction, 

 near San Diego, which died before reaching home. Mr. Caudell and I made a special 

 trip to the swamp later to get more larvae, but it had gone dry, leaving little 

 puddles of dying fish and a great quantity of Anopheles larvae, all of which no doubt 

 died within twenty-four hours. 



Larva. Head rounded, scarcely longer than wide, neck circular, the occiput 

 oblique, roundedly angled at the side, then nearly straight, the front margin 

 broadly, squarely truncate; labrum deeply excavate each side of the middle, form- 

 ing a triangular horn-like prominence in the middle and one on each side, midway 

 between the central one and the antennae. Eyes large, semicircular, transverse; 

 two approximate multiple hair tufts above and within the eye, another on the lower 

 part of the front on each side; a large multiple tuft about base of antennae. No 

 trace of the usual thick, club-like hairs; if they are broken, the insertions are not 

 visible. Antennae small, not exceeding the mouth brush, conically tapered on basal 

 two-thirds, a few spines within, a single hair at about the basal third ; four terminal 

 digits, all along and pointed, nearly equal. Deep brown, nearly black, lighter at the 

 margins of the eyes. Thorax nearly circular in outline, flattened; a minute double 



