STUDIES ON CHROMOSOMES 



79 







a 



c 



XY- 



XY 



J 



k 



Fig. 3 First and second spermatocyte-divisions in the two species of Nezara. 

 a, 6, first division, hilaris, polar views: c, d, corresponding views of viridula; first 

 division, hilaris, side view showing five of the chromosomes in position and the 

 other three to the right above;/, corresponding view of viridula; g, middle ana- 

 phase, viridula, showing division of Y; h, first division metaphase, hilaris, all the 

 chromosomes artificially spread out in series; i, corresponding view of viridula; 

 j, k, second division metaphase, hilaris, polar views; I, m, corresponding views 

 of viridula. 



