INTERNAL ANATOMY OF INSECTS. 



small intestine and rectum, and not more than three pairs 

 offaed or united bile-vessels. In the Predaceous beetles, 

 the gullet mostly widens at the base into a considerable 

 crop, followed by a gizzard, a shaggy stomach, and two 

 pairs of united bile-vessels. The whole alimentary canal 

 in these, is never less than double, and sometimes treble 

 the length of the body a . In the carnivorous beetles, at 

 least the Staphylinidte and Silphidat, there is little or no 

 crop, and the gizzard is hidden : in the former, the whole 

 length of the intestinal canal is not twice, while in the 

 latter it is more than four times that of the body b . In 

 these also the intermediate portion of the large intestine 

 is singularly annulated c . In the Petalocera the stomach 

 is usually longer than all the rest of the intestines to- 

 gether, and often convoluted : in the cockchafer the 

 whole intestinal canal is nearly Jive times the length of 

 the body, four parts of which is occupied by the stomach* 1 . 

 In the grub the canal scarcely exceeds the length of the 

 animal e . In Lampyris the stomach exhibits a remark- 

 able appearance, having on each side a series of spheri- 

 cal folds or vesicles f . Have these any thing to do with 

 the secretion of its phosphoric matter ? Tenebrio has a 

 gizzard armed internally with calluses, and a shaggy sto- 

 mach, and Blaps does not differ materially ; their entire 

 canal is more than twice the length of the body s. In the 

 vesicatory beetles (Cantharis, Meloe, &c.) there is no giz- 

 zard, and the canal is less than twice the length of the 

 body h . Little is known with regard to the alimentary 

 canal of the beetles distinguished by a rostrum (Rhynco- 



a Ramdohr Anat. t. ii. iii. xxv. b Ibid. t. iii./. 6. t. iv./. 2. t. v./. 1. 



c Ibid.f. l.c.f. 3. a Ibid. 122, * lbidm 123> 



f Ibid. t. v./. 4. B. E Ibid. !)4. ' 7/w/. -9G , 



VOL. IV. I 



