420 



ZOOLOGY. 



fied in their shape. At the base of this proboscis we distin- 

 guish anteriorly a small membranous piece, which is the re- 

 presentative of the labium 

 or lip, and on each side a 

 small tubercle, the last 

 vestige of the mandibles. 

 We observe also here the 

 rudiments of the maxillary 

 palpi, and behind is found 

 a small triangular lip 

 carrying two very large 

 labial palpi, composed of 

 three joints, and almost 

 always velvety and covered 

 with scales (e). 



525. The alimentary 

 canal presents in general a 

 sufficiently complex struc- 

 ture ; sometimes it is 

 straight, and offers pretty 

 nearly the same diameter 

 throughout its whole 

 length; but in general 

 it is more or less flexuous, 

 and has several successive 

 enlargements and contrac- 

 tions. We distinguish, 

 then (Fig. 443), a pharynx, 

 a gullet, a first stomach 

 or crop, a second stomach 

 or gizzard, whose walls 

 are muscular, and often 

 provided with horny parts 

 adapted to triturate the 

 food ; a third stomach, 

 called the cliylifying 

 stomach, whose texture is 

 soft and delicate ; a small 

 intestine, a ca3cum, and 

 Fig. 443. Digestive Apparatus.* a rectum. As ill the 



* a, head carrying the antennae, mandibles, &c. ; b, crop and gizzard, fol- 

 lowed by the chyle-forming stomach; c, biliary vessels; d, intestine; e, 

 s ecreting organs ; f t anus. 



