INTERNAL ANATOMY OF INSECTS. 11] 
quadrangular canal*. In the Homopterous section of 
this Order Ramdohr seems to have examined but few; 
Chermes however and Aphis exhibit one remarkable fea- 
ture; they have no dile-vessels, at least he could discover 
no trace of these organs>. Their intestinal canal is very 
simple, their stomach very long, widest above, and some- 
what convoluted, with a very slender gullet®. In Ce- 
reopis spumaria the structure is more complex, and ex- 
tremely singular. It has ¢wo or rather three stomachs ; 
the two first of a horny substance, and the last a slen- 
der somewhat convoluted membranous tube, which be- 
coming reversed, is attached by what should be deemed 
its lower extremity to the first stomach, from the other 
side of which emerge the lower intestines, terminating in 
a thick pear-shaped rectum. At the same point of the 
first stomach the four bile-vessels are attached, they 
grow gradually thicker for about a third of their length, 
when they become twisted like a cord, and taper towards 
the rectum, to which also they are attached? From 
this structure it should seem that the food has to pass 
twice through the first stomach, before the process of 
digestion is complete, and it is rejected at the anus. 
The next suctorious Order is the Lepidoptera: in 
these the gullet is long and slender, surrounded at the 
beginning with a loose transparent skin, and at the base 
furnished with a pair of lateral sacs, forming the honey- 
stomach, and probably analogous to the food-reservoirs 
of the Diptera, which when blown up are of an oval 
form; the stomach, as in the bugs, consists of ¢wo por- 
@ Ramdohr ¢. xxii. f. 1. .D, E.f. 3. C, D.f. 4. C. ° Ibid. 198. 
° Ibid, t. xxvi. f. 2. 4. 4 Tbid. t. xxxiil. fi 3. 
