Carpenter et al. : Mosquitoes of Southern U. S. 



135 



Phallosome (Ph) heavily sclerotized, conical, open ventrally, closed dorsally 

 on basal half; apical half of each plate with a broad lateral thorn-like projec- 

 tion and a dorsal longitudinal toothed ridge. Claspette (CI) extending to apical 

 third of basistyle, stem slender; apex with a broad glabrous sickle-shaped fila- 

 ment inserted on outer angle, and a strong fleshy thumb-like projection directed 

 mesad, clothed with numerous flexible setae. Basistyle (Bs) cylindrical, rounded 

 apically, about two and one-half times as long as broad, clothed with sparse 

 scales and numerous long setae; basal and apical lobes absent. Dististyle (Ds) 

 about two-thirds as long as basistyle, somewhat bowed inward medially, taper- 

 ing at outer third, with short stout setae arising from inner surface; a dorsal 

 angular projection present at outer fifth; tip curved and terminating in a short, 

 strong claw (Ds-C). 



LARVA. (Fig. 68). — Large larva. Head quadrate, concave anteriorly, broader 

 than long. Antenna about one-third as long as head, extending near anterior 

 margin of head, sparsely spined; antennal tuft represented by a single short 

 hair on outer third. Mouth brushes formed of stout prehensile hairs, each 



Fig. 68. Larva of Psorophora ciliata (Fabricius). A. Terminal segments. 

 B, Mouth Brush. C, Pecten spine. D, Comb scale. E, Head. 



