146 ALICE M. BORING. 



EXPLANATION OF PLATE IV. (Aphrophora spumaria). 



FIGS. 26-29. Equatorial plates of primary spermatocytes of four different 

 individuals with different somatic markings, one largest chromosome in each (A). 



FIGS. 30-32. Growth stages of primary spermatocytes. 



FIGS. 33, 35-37. Anaphases of primary spermatocytes, X toward one pole. 



FIGS. 34-37. Drawings showing small chromatin bodies, which may be super- 

 numeraries. 



