70 



INTERNAL STRUCTURE. 



■vs.— .«i«KiSa**S*6*«- 



C <? G 



Fig-. 41. — Digestive organs of a locust (above) and of a katydid or grasshopper 

 (below). Oes, oesophagus; cr, crop; g; gizzard; c, cascal pouch and tubes; s, stomach: 

 /nt, malphighian tubes ; //, ileum ; c/, colon. Original. 



and then bends at fight angles, and passes into the thorax. 

 In the mesothoraxthe cesophagus gradually enlarges to form 

 a thick-walled pouch, the crop or ingluvies {cr), which oc- 

 cupies the meso- and metathoracic segments. On the sides of 

 the anterior end of the ingluvies are the delicate, white, 

 dendritic, salivary glands, which communicate with two 

 salivary ducts, one of which runs forward on each side of the 

 oesophagus into the head. Running back from the posterior 

 end of the ingluvies to the seventh abdominal segment is a 

 large cylindrical pouch, the proven trie ulus or gizzard (g). 

 Its anterior end is about as large as the posterior end of the 

 ingluvies, and its posterior end is much smaller. Surround- 

 ing the spot, where these two chambers join each other, are 

 sixteen transparent cone-shaped pouches, the pyloric or csecal 

 pouches, (c), placed base to base in such a way as to form a 

 belt of eight fusiform pouches around the digestive tract. If 

 the tracheae, which bind them to the digestive tract, are re- 

 moved it will be found that the pointed ends are free, eight 

 of them running forewards on the sides of the ingluvies, and 

 eight backwards on the proventriculus. Occupying the 

 seventh, eighth and ninth abdominal segments is the ven- 

 triculus, or true stomach, (s) much smaller than the pro- 



