NO. 8 ANATOMICAL LIFE OF THE MOSQUITO SNODGRASS 



41 



on the sides of the first abdominal segment of the pupa covered by 

 the metathoracic wing pads. The tracheal system of the pupa, how- 

 ever, is so weakly developed that it would hardly seem capable of 

 supplying the amount of air carried by the living pupa. Manzelli 



PhL 



Fig. 16. — The pupa. 



A, Aedes aegypti, male pupa, lateral. B, Same, terminal part of female 

 abdomen. C, Culex sp., thorax and base of abdomen, dorsal. D, Same, end of 

 female abdomen, dorsal. E, Same, apical structures of male abdomen. F, Same, 

 phallic organ of male pupa, ventral. 



br, suspensory brush of first abdominal tergum ; H, head ; N$, metanotum ; 

 PhL, phallus ; Prb, proboscis ; Reel, rectum ; S, sternum ; T, tergum ; tf, tail fin ; 

 Tmp, respiratory trumpet; IV t, mesothoracic wing; Ws, metathoracic wing; 

 I-X, abdominal segments. 



(1941) described and figured the pupa as "enclosed in a sac-like struc- 

 ture," which he says "has long been seen by all mosquito workers and 

 is usually known to them as the pupal shell." This is a curious state- 

 ment, since no such structure exists. Furthermore, the "shell" is said 



