DIGESTIVE ORGANS OF INSECTS. 



1^5 



and capacious canal for their assimilation; as is shown in 

 Fig. 319, which represents them prepared in a similar man- 

 ner to the former. In this herbivorous insect, the oesopha- 

 gus (o) is, as might be expected, very short, and is soon di- 

 320 lated into a crop (*p;) this is followed by a very 



long, wide, and muscular stomach (s,) ringed 

 like an earth-worm, and continued into a long 

 and tortuous intestine (i, i,) which presents 

 in its course several dilatations (c, c,) and re- 

 ceives very elongated, convoluted, and rami- 

 fied hepatic vessels (h,h.) Fig. 320 is a highly 

 magnified view of a small portion of one of 

 these vessels, showing its branched, form. 



In the alimentary canal (Fig. 321"^) o^ihe ^crida aptera 



(Stephens,) which is a species of grass- 

 hopper, feeding chiefly on the dewberry, 

 we observe a long oesophagus (o,) which 

 is very dilatable, enlarging occasionally 

 into a crop (i,) and succeeded by a round- 

 ed or heart;shaped gizzard (g,) of very 

 o 325 complicated structure, and connected with 

 two remarkably large biliary pouches (u 

 and B,) which receive, at their anterior 

 324 extremity, the upper set of hepatic ves- 

 sels (v V.) A deep furrow in the pouch 

 (b,) which, in the horizontal position of 

 the body, lies underneath the gizzard, 

 divides it apparently into two sacs. The 

 intestinal canal is pretty uniform in its 

 diameter, receives in its course a great 

 K number of hepatic vessels (h ir,) by se- 

 parate openings, and after making one 

 convolution, is slightly constricted at n, 

 and is dilated into a colon (c,) on the 



* The figures relating- to this insect were engraved from the drawings of 

 Mr. Newport, who was also kind enough to supply me with the description 

 of the parts they represent. Fig. 321 is twice the natural size. 



