90 MOSQUITOES OF NORTH AMERICA 



ate, densely covered with scales similarly to those of posterior end of meso- 

 notum, each lobe with a tuft of brown bristles. Postnotum elliptical, promi- 

 nent, dark brown, with a rounded median carina, a tuft of about ten large 

 bristles posteriorly. Pleurae dark brown, coxae luteous, clothed with elliptical, 

 flat silvery-white scales, a large patch of brownish ones behind the prothoracic 

 lobe. 



Abdomen subcylindrical, truncate at the tip, which bears many black hairs; 

 dorsal vestiture black, with faint greenish reflection; first segment with blue- 

 green luster and with pale bristles ; venter pale golden, the colors separated on 

 the sides in a sharp, straight line ; scales raised along medioventral line. 



Wings moderate, hyaline, iridescent; petiole of second marginal cell one- 

 third as long as cell, that of second posterior cell much shorter than its cell; 

 cross-veins nearly incident ; scales of veins black, with a bronzy green reflection, 

 elliptical, many obliquely subtruncate, those on second vein larger and denser. 

 Halteres blackish, except at the base. 



Legs slender, the vestiture black with a blue and violaceous reflection ; femora 

 and tibiae, except tip of latter, brassy beneath ; last tarsal joint of the mid legs 

 and last two of the hind legs white on under side. Claw formula, 0.0-0.0-0.0. 



Length : Body about 4 mm.; wing 3.5 mm. 



Larva, Stage IV (plate 87, fig. 376). Head rounded anteriorly, posterior 

 angles slight ; antennae moderate, smooth, uniform ; dorsal head-hairs all single. 

 Lateral hairs of abdomen multiple on first two segments, double on third, single 

 on the rest. Comb of eighth segment of about nine separate teeth in a single 

 row. Air-tube straight, slightly tapered, about five times as long as wide, a row 

 of single hairs on dorsal aspect, a few on posterior aspect, and a dense fringe of 

 long, fine hairs along posterior line nearly to tip ; a few terminal hairs, the hooks 

 stout. Anal segment as long as wide, dorsal plate large; dorsal tuft of three 

 long hairs on each side, lateral hair single, subventral tuft of two long hairs and 

 attached to dorsal plate. Anal gills subequal, stout, more than twice as long as 

 the segment. 



The natural breeding-places of the species are unknown. Mr. Busck took a 

 single larva, about which he says : 



" A single larva taken, together with Culex and Anopheles larvae, in a nearly 

 quiet pool of a slow-running, cold, clear brook in the mountains back of Empire. 

 This is a very unusual breeding-place for a larva of this genus, and it is prob- 

 able that this single larva had been washed out by a rainstorm from a Tillandsia 

 on an overhanging branch or from an overflowing tree-hole or bamboo-joint." 



Mr. Busck informs us that there had been heavy rains just preceding his dis- 

 covery of the larva, and that to both himself and Mr. Jennings, who accompanied 

 him, the discovery of the larva seemed unusual and it looked to be out of place. 

 The adults were taken commonly at Lion Hill, where they came to bite in the 

 daytime. Mr, Busck reports that they bit viciously. He says : 



" This was the common mosquito in the Black Swamp from Ahorca Lagarto 

 to Gatun, and came in numbers whenever one stepped into the shade of the 

 brush. I was not able to locate its larvae." 



Panama. 



Lion Hill, Canal Zone, 64 specimens caught in the act of biting (A. Busck) ; 

 bred from a single larva taken in a quiet pool in a brook near Empire, Canal 

 Zone, May 7, 1907 (A. Busck) ; Tabernilla and Gatun, Canal Zone, 1909 (A. H. 

 Jennings). 



This species was first described as a Sabethes, the eyes appearing to be con- 

 tiguous at the vertex. A close inspection shows that they are really separated by 

 a narrow wedge, although they are considerably invaginated in the type speci- 

 men. We are therefore enabled to correct the generic location. The species is 



