MOSQUITO BIOLOGY 185 



spot at cross-vein ; abdomen dark brown, with white lateral marks 

 which tend to cross dorsal surface. 



DESCRIPTION OF THE ADULT 



Moderate build, measuring 5-5.5 mm. (.20-.22 inch) long, exclud- 

 ing proboscis, which not quite half length of body. Head velvety black 

 with some white scales scattered on central part ; clearly defined white 

 border to eyes. Proboscis narrow at base, becoming dilated toward 

 tip ; black, with white scales scattered at sides, forming black median 

 line. Palpi in female little over one-third the length of proboscis, 

 three- jointed, basal two joints long and slender, black with few white 

 scales, terminal one very small and wholly white. In male palpi slender, 

 as long as proboscis, three- jointed, basal joint long, terminal one 

 very small; black with some white scales, base of second joint and all 

 of third white; few long bristles on last two joints. Female antennae 

 black with scattered white scales ; in male black with silky brown 

 plumes. 



Thorax velvety black with fine white hairs over surface and long 

 lateral black ones ; two bluish white, narrow dorsal lines on anterior 

 two-thirds ; two similar arcuate lateral ones extending entire length of 

 thorax ; two broken ones on posterior half which extend forward be- 

 tween lateral and central ones. Pleura blackish with few white scales 

 collected into small patches. Femora and tibiae black with white scales 

 sparingly scattered over surface, their apices and base of tibiae in 

 posterior legs white, bases of femora yellowish, especially on under 

 side. Anterior and middle tarsi black, usually without rings, though 

 extreme apices of joints and base of first joints of middle tarsi pale, 

 often distinctly yellowish. Posterior tarsi broadly banded with pure 

 white at both ends of joints, last one wholly white. Claws of male an- 

 terior and middle tarsal joints unequal, larger with long blunt tooth 

 one-third from base, smaller with extremely small acute tooth near 

 base ; posterior claws equal and simple. Female claws equal and simple 

 on all feet. Wing veins clothed with brown and white scales, giving 

 wing grayish appearance. On radius and media, at connection with 

 cross-vein, white scales only, which together form distinct white spot ; 

 scales on basal half of anal vein also white. 



Abdomen brownish black with considerable variation in banding. 

 Always large white spot, sometimes divided transversely in two on 

 basal segment, confined to dorsal surface. Following three segments 

 have narrow, ill-defined basal bands, often entirely obsolete; apical 



