PLATE 2 



EXPLANATION OF FIGURES 



Onco peltus, excepting 28, 29, 45, 46, which are from Lygaeus. Enlargement 2250 

 diameters. 



22-23 Final anaphases of the first division. The sex-chromosomes not visible 

 in these views. 



24-25 Polar views of two daughter-chromosome plates from the same stage as 

 the foregoing (from different spindles) showing the X F-bivalent near the center 

 (no. 712). 



26-27 Similar views of sister-groups from the same spindle (no. 760). 



28-29 Sister-groups from the same spindle. Lygaeus. 



30-32 Interkineses, showing the chromosome-groups, the first in side-views, 

 the others in face-view showing all the chromosomes (no. 760). 



33 Prophase of second division. 



34-35 Second division metaphase in polar view. 



36-44 The same in side-view, the sex-chromosomes seen separating in several 

 of the figures (36-41, equal type, no. 712; 42-44, unequal type, no. 760). 



45-46 (photo. 6) Second division metaphases of Lygaeus, lying side by side 

 in the same section, one in polar view, one from the side. 



434 



