102 INTERNAL ANATOMY OF INSECTS. 
nerally 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 intes- 
tine, as in Callichroma moschatum*. 
4. The large intestines (Intestina magna) consist some- 
times of two portions. The thick intestine (Dicken-darm), 
which may be regarded as a kind of cecum, 1s found only 
in the larvee 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 intestinal canal, and is 
constantly filled with excrement®. The second portion 
of these intestines is the rectum (Mastdarm), which ter- 
minates in the anal passage. ‘This part is scarcely ever 
wanting, except when the insect evacuates no excrement, 
which is the case with the grubs of bees, wasps, and the 
antlion (Myrmeleon). In the imago of Telephorus, at 
least in 7\ fuscus, it is also obsolete®: in most cases, how- 
ever, it is very distinct from the preceding intestine. 
Sometimes it consists of only one tunick composed of 
muscular fibres?. When the gullet is wide, the rectum 
is usually so likewise; but when it follows a club-shaped 
or thick intestine, it is narrow’. It generally may be 
termed shortf. When wide, it often contains a great 
quantity of excrement, as the gullet does of undigested 
food; but when narrow, the excrement seldom remains 
long in it. This intestine also in a few cases has a lateral 
enlargement or cecum ( Blind-darm), being a continuation 
of the same skin; but perhaps this enlargement is really 
* Ramdohr dnat. t. xxiv. f. 1. F. 
» Ibid. 36. t. vii. f. 2. kk. t. viii. f. 3. g, hh. 
* Tbid. t. xu. f. 1. t. xvii. f. 1. 2. vii. f 5. @ Thid. 37. 
* [bid. 38. t Tbid. 
