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 ileum, 
Ramdohr distinguishes by the name of club-shaped 
(Ketilformigen Darm z ). 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- 
rambyx moschatus\ 
4. The large intestines {Intestina magna) consist some- 
times of two portions. * The thick intestine {Dicken- 
darm) t 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 Telephorus, at least in T. fuscus, it is also obso- 
lete d : 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 
1 Ramdohr Anat. 35. " Ibid. t. xxiv./ 1. F. 
c Ibid. 36. /. vii./. 2. kk. t. viii./. 3. g, hh. 
d Ibid. t. xii./. 1. /. xvii./. 1. /. vii.,/'. ."». 
c Ibid. 37. f Ibid. 38. B Ibid. 
