222 ANNUAL REPORT SMITHSONIAN INSTITUTION, 19 34 



Stevens, N. M. 



1905. Studies in spermatogenesis. Carnegie Inst. Washington Publ. No. 

 39, pp. 3-32. 

 Sutton, W. S. 



1902. On the morphology of the chromosome group in Brachystola magna. 

 Biol. Bull., vol. 4, pp. 24-39. 

 Weismann, a. 



1902. Vortrage iiber Descendenztheorie. Jena. 

 Wilson, E. B. 



1905. Studies on chromosomes. I. The behavior of the idiochromosomes in 

 Heraiptera. Journ. Exp. Zool., vol. 2, pp. 371^05. 



