INSECTA. 



377 



stniight: there is neither crop nor gizzard, the chylific stomach is 

 longrcylindrical, and is divided from the oesophagus by a slight con- 

 striction ; the short intestine which succeeds is dilated at its com- 

 mencement, and plicated longitudinally as far as the contracted 

 rectum. In other insects a duodenal and iliac tract of intestine may 

 be distinctly recognised. In the tiger-beetle {Cicendela, Jig. 150) 

 and the carnivorous Carahidcc, 

 there is a small gizzard {b), 

 preceded by the usual ingluvial 

 dilatation of the oesophagus {a) 

 and followed by a long chylific 

 stomach, the external surface of 

 which is beset with secerning 

 follicles (c). The small intes- 

 tine (c) makes a slight bend 

 before terminating in the di- 

 lated colon (/). 



The alimentary canal of the 

 browsing cockchafer is consi- 

 derably longer, and is disposed 

 in three or four coils. But in 

 the Orthopterous vegetable- 

 feeding insects, the canal is 

 characterised by its superior 

 width rather than by its length ; 

 and in them the complications 

 requisite for animalizing the 

 food are chiefly manifested by 

 the gastric division. The oeso- 

 phagus dilates into a wide glandular crop in the cockroaches* and 

 locustsf, and has a similar receptacle appended to it in the mole- 

 cricket.^ The gizzard has a strong muscular coat and a callous 

 epithelium, the inner surface of which is beset with projecting teeth 

 or hooks, as in the cockroach, or with scale-like plates, as in the 

 cricket, generally disposed in longitudinal rows. The tunics of the 

 chylific stomach are produced at its commencement into ciecal ap- 

 pendages, which augment and complicate its cavity. There are two 

 such casca in the common and mole-crickets, four in Locusta ser- 

 rata, six in the migratory locust, and eight in the cockroach. In the 

 coleopterous Duprestidce the stomach is prolonged into two ciccal ap- 



Cicendela campestris. 



Preps. Nos. 607, 608, 609. 



t Nos. 443. 610. 



% No. 611. 



