116 INTERNAL ANATOMY OF INSECTS. 



sels, like those of the two preceding Orders, are nume- 

 rous, short, and free a . In the ants and ichneumons there 

 is an approach to a gizzard b . In the wasp and humble- 

 bee the stomach is very long, with muscular rings sur- 

 rounding it c . In this Order the larvae at first have no 

 lower intestines and void no excrement d , but as they ap- 

 proach to the pupa stafe one begins to appear e . 



The next insects whose alimentary canal we are to 

 consider, are those which, taking their food by suction, 

 have no occasion for masticating organs : this may in 

 part be predicated of the preceding Order, in which 

 most of the tribes in their perfect state imbibe fluid food, 

 and use the ordinary organs of mastication principally in 

 operations connected with their economy ; and their crop, 

 in which the honey in many is stored up for regurgita- 

 tion, may be regarded in some degree as analogous to the 

 food-bag of the Diptera and other suctorious insects. 



The two sections of the Hemiptera Order differ widely 

 in the canal we are considering, and I shall therefore 

 give a separate account of each. In the Hetcropterous 

 section, appended to the gullet by a long convoluted ca- 

 pillary tube, besides the usual saliva-reservoirs there is 

 often a double vessel, which Ramdohr regards as dis- 

 charging the same function, but which in many respects 

 seems rather analogous to the food-reservoir of the Di- 

 ptera f . As I have had no opportunity of examining this 

 vessel, I shall content myself with stating this idea, and 

 describe the vessel more fully hereafter. The gullet, in 



a Ramdohr t. xii./. 6. H. t. xiii./. I./ 



b Ibid. t. xiv./. 2, 3, C. c Ibid. t. xii./. 6. D. t. xiii./. l.b. 



o Ibid. 133. /. xii./ 13. e Ibid.f. 4. 



f Comp. Ramdohr t. xxii./. 3. M. FIG. 4. 3. with /. xxi./. 1. /. 



