. , ' 
160 INVERTEBRATE ANIMALS. 
flowers. In the butterflies, too, in which the mouth of the 
adult is'strictly adapted for suction, the caterpillar is furnished 
with a masticating mouth, so that it can feed upon leaves, or 
other solid substances. | 
The mouth in the masticating insects (fig. 79, @) leads into a 
membranous and often folded cavity, termed the “crop” (4), 
Fig. 79.—Digestive apparatus of a Beetle (Cavabus auratus). a Gullet; 4 Crop; 
¢ Gizzard; @ Chylific stomach; ¢ Malpighian tubes ; / Intestine; g Cloaca; % 
Renal vessels. 
from which the food passes to a second muscular cavity or 
“gizzard” (c). The gizzard is adapted for crushing the food, 
and often has plates or teeth of chitine developed in its walls, 
It is succeeded by the true digestive cavity (Z), which is termed 
the “chylific stomach.” From this there proceeds an intestine 
(/), of variable length, which usually terminates in a chamber 
called the “cloaca” (g), into which the ducts of the repro- 
ductive organs open. The commencement of the gullet is 
furnished with glandular appendages, which are believed to 
