57-16 



Proceedings of the American Academy of Arts and Sciences. 

 Vol. 67. No. 16.— Novembek, 1922. 



STUDIES ON INSECT SPERMATOGENESIS. 



IV. THE PHENOMENON OF POLYMEGALY IN THE SPERM CELLS 

 OF THE FAMILY PENTATOMIDAE. 



By Robert H. Bo wen.. 



FaoM THE Dbpartmbnt of Zoology, Columbia Univehsitv. 



With Two Plates. 



