PLATE 11 



EXPLANATION OF FIGURES 



91 to 100 Tettigidea parvipennis pennata Morse. 



91 Spermatogonium, 13 chromosomes. Sex chromosome ranks fifth in the 

 series, being between the fourth and fifth autosomes in size. 



92 Spermatogonium, 13 chromosomes. 



93 to 98 Late prophases of first spermatocyte. Chromosomes in some cases 

 illustrated out of their natural position to provide more room. 



99 First spermatocyte division. The no. 4 pair is lacking, lost in sectioning 

 the cell. 



300 



