THE MOSQUITO 



45 



various mouth appendages can by a skilful 

 use of dissecting needles be separated out, 

 but in nature they are all packed together in 

 a case ; the arrangement in the case is shown 



,mn 



.nix 



Sal 



Fig. 14. — Transverse section through 

 the middle of the proboscis of a female 

 Anopheles maculipennis, showing the rela- 

 tive position of the parts when at rest. 

 Two tracheae and two pairs of extensor 

 and flexor muscles are seen in the labrum. 

 Ixe, Labrum + epipharynx ; tr, trachea ; 

 mus, muscles ; hp, hypopharynx ; sal, 

 salivary duct ; mx, first maxilla ; mn, 

 mandible. (From Nuttall and Shipley.) 



by Fig. 14, which represents a trans vese section 

 of the proboscis. The term ' proboscis ' is 

 given to the totality of all these structures 

 taken and packed together. With the excep- 

 tion of the labium and of the tactile maxillary 

 palps all the mouth appendages lance into 

 the skin. The proboscis of the male is, how- 



