Carpenter et al: Mosquitoes of Southern U. S. 



35 



Baslstyle (Bs). — The basistyles are a pair of large, hollow, thigh-like 

 processes apparently arising from the ninth sternite. They usually bear long 

 setae and scales, and may or may not possess apical, subapical, or basal lobes 

 on the inner surfaces. A subapical lobe (S-L) is evident in Cidex and bears 

 important rods, spines, and leaf-like appendages. An apical lobe (A-L) is 

 often present in Aedes, with varying shape and vestiture. A basal lobe (B-L) 

 is present in several genera, but is best developed in some of the Aedes, where 

 it may give rise to one or more large spines and characteristic hairs. The 

 basal lobe is represented in Anopheles by only the large, parabasal spines (P- 

 S) ; it is always absent in Cidex, which Ijears instead the subapical lobe, prob- 

 ably homologous with the basal lobe of Aedes. 



Dististyle (Ds). — An articulated appendage, the dististyle, is borne on the 



x-S- 



Fig. 13. Diagram of male terminalia of Culex (right plate of phallosome is shown 

 in bold lines for clearness, although it lies beneath the tenth sternite). B-P, basal plate; 

 Bs, basistyle; Ds, dististyle; Ds-C, claw of dististyle; IX-S, ninth sternite; IX-T, 

 ninth tergite; IXT-L, lobe of ninth tergite; Ph. phallosome; Ph-DA, dorsal arm of 

 phallosome; Ph-T, lateral teeth of phallosome; Ph-VA, ventral arm of phallosome; 

 S-L, subapical lobe; SL-A, appendages of subapical lobe; X-S, tenth sternite; XS-BA. 

 basal arm of tenth sternite; XS-C, crown of tenth sternite; XS-DA, dorsal arm of 

 tenth sternite. 



