D 



FIG. 40. Leptinotarsa decemlineata. Stages in cyst formation in testis. 

 A. Spermatogonia (spg), cells of terminal cap (t.c), and epithelial 

 cells (ep). B. Mi totic division of spermatogonium. C. Later stage 

 in same process. D. Binucleate spermatogonial cell within epithe- 

 lial envelope. E. Four spermatogonia connected by spindle re- 

 mains. F. Spermatogonia from cyst containing eight cells. 

 G. Section through cyst containing thirty-two spermatogonia. (127) 



