INTERNAL ANATOMY OF INSECTS. 115 
of life of the animal, we see evidently the all-powerful 
hand of that ALMiGuTry Berne who created the universe, 
upholding by his providence, and the law that he has 
given to every creature, the system that he at first brought 
into existence. 
We now come to the Diptera. These have a very slen~ 
der gullet, to which is attached on one side a long fili- 
form tube, terminating in the food-reservoir, which in 
some instances is simple*, but most generally consists of 
two or more vessels”, collapsing when empty, but vary- 
ing in shape and size when inflated with food: the mouth 
of the stomach in many cases is dilated into a kind of 
ring ©; sometimes there is on each side a blind appendage 
or cecum opening into it, in Bombylius covered with 
shags, which though not connected with the mouth by a 
tube, Ramdohr regards as saliva-reservoirs¢; in Musca 
vomitoria the beginning of this organ below the mouth 
is covered with hemispherical prominences, and in 77- 
pula it is dilated and marked with transverse folds. There 
are usually ¢wo pairs of bile-vessels; in the Muscide 
pedunculate and free*; in Tipula, Bombylius, and Rhagio, 
sessile and unzted'; and in Tabanus sessile and jfired®, 
It is remarkable that in some of this Order—the reverse 
of what usually happens—the alimentary canal appears ta 
be much longer in the larva than it is in the Imago; in 
Musca vomitoria, its length in the former is two inches 
and a quarter, while in the Jaffer it is only one inch and 
* Ramdohr, Jdid, t.xx.f. 1. E, f. G. C. 
b Ibid. t. xix. f. 2. Cif. 3. CCD. t. xx. f. 2. B. 
©. Gbid. t. xix. f. 2. D, 
4 Tbid, £ XX. f, 2. FF. f. 6. DD. 184, 180.— 
© Tid diez WON. f2. OP. f. 3. Fo texxvins 6 3, 2! 
* Tig see Gp Sato. La. ew bid. tate feb 
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