Fic. 40.— Leptinotarsa decemlineata. Stages in cyst formation in testis. 
A. Spermatogonia (spg), cells of terminal cap (¢.c), and epithelial 
cells (ep). B. Mitotic division of spermatogonium. C. Later stage 
in same process. D. Binucleate spermatogonial cell within epithe- 
lial envelope. #. Four spermatogonia connected by spindle re- 
mains. F. Spermatogonia from cyst containing eight cells. 
G. Section through cyst containing thirty-two spermatogonia. (127) 
