LOCUST 



425 



the segments have fused together. In the larvae of insects there is 

 usually a ganglion to each segment. Three large, well-developed 

 ganglia are found in the thorax; the anterior one is connected with 

 the subesophageal ganglia which in turn are connected with the 



--Vo< 



'e-.ej 



*tS!S 



-r^.^. 



if.: 



'fi 



>> 



-•R. 



Fig. 174. — Digestive system of Rhomaelia microptera. A, anus ; C, crop ; Co., 

 colon; G.C., gastric caeca; Int., intestine; M, mouth; M.2\, Malpighian tubules; 

 Oe., esophagus; R, rectum; Sal., salivary glands; St., stomach. (From White, 

 General Biology, The C. V. Aiosby Company,, 



