108 INTERNAL ANATOMY OF INSECTS. 



haps may in some cases be regarded as analogous to the 

 jejunum in vertebrate animals. The third pair of the 

 small intestines, which perhaps represents the Hewn, 

 Ramdohr distinguishes by the name of club-shaped 

 (Keidforrtiigcn Darm*}. It may generally be regarded 

 as only a continuation of the former thickened at the 

 end so as to resemble a club reversed. It is however 

 sometimes separated from the thin intestine, as in Ce- 

 ranibyx moschatus b . 



4. The large intestines (Intestina magna] consist some- 

 times of two portions. The thick intestine (Dicken- 

 dar?ri), which may be regarded as a kind of ccecum, is 

 found only in the larvae of the Lamellicorn beetles, but 

 never in the perfect insect. In shape it is oval and 

 folded ; whence it is thicker than the rest of the intesti- 

 nal canal, and is constantly filled with excrement . The 

 second portion of these intestines is the rectum (Mast- 

 darm), which terminates in the anal passage. This part 

 is scarcely ever wanting, except when the insect evacu- 

 ates no excrement, which is the case with the grubs of 

 bees, wasps, and the antlion (Myrmeleon}. In the imago 

 of TeleplioruS) at least in T. Juscus, it is also obso- 

 lete 11 : in most cases, however, it is very distinct from 

 the preceding intestine. Sometimes it consists of only 

 one tunick composed of muscular fibres 6 . When the 

 gullet is wide, the rectum is usually so likewise; but 

 when it follows a club-shaped or thick intestine, it is 

 narrow f . It generally may be termed short ?. When 



a Ramdohr Anat. 35. " Ibid. t. xxiv./. 1. F. 



c Ibid. 36. t. vii./. 2. kk. t. viii./. 3. g, ////. 



a Ibid. t. xii./, 1, /, xvii./. 1. /. vii./. ^. 



c Ibid. 37. f Ibid. 38. c Ibid. 



