222 L. M. HICKERNELL. 



EXPLANATION OF PLATES. 



INDEX TO FIGURES. 



ac anterior crop. 



at ascending intestine. 



dt descending intestine. 



int internal gland. 



kk -coil in descending intestine. 



ml -malpighian vessels. 



pc -posterior crop. 



r rectum. 



PLATE I. 



FIG. i. Digestive system of cicada nymph of 2 mm. body length, seen from the 

 left side. 



FIG. 2. Digestive system of cicada nymph of 14 mm. body length, seen from 

 the left side. 



