EPILACHNA. 

 HEREDITY. 



77 



Since it is difficult to get two broods through in a year and since the loss 

 in hibernation is heavy, the experiments were frequently interrupted at 

 the end of one generation (table 19) . The death-rate from hibernation 

 of the forms with confluence of spots was higher. This matter should be 



() The distance between and 



confluence of spots 2 and 3. 

 (f) Males, 

 (e) Females, 

 (rf) All individuals. 



(a) 19 18 17 16 15 14 13 12 11 10 9 8 T 6 54 3 2 1 1 25 



(b) 3 1 7 5 13 15 46 39 19 18 20 11 83 4 1 



(c) 2 1 4 4 10 13 15 22 24 23 13 6 9 132 1 1 000 0=156 

 <rf) 2 4 5 11 15 26 31* 69 63 42 33 26 22* 9 6 6 1 1 1 00 1 = 374 



FIG. 87. Variation of distance between and confluence of spots 2 and 3 in Epiluchna. 

 borealit at Cold Spring Harbor, New York. 



experimentally tested with large numbers. The heredity of the forms 

 with confluence differs from that of the varieties of Hippodamia with con- 

 fluence, as would be expected where intergrades are more frequent. The 

 forms are inherited as if they represented an extreme in fluctuation, but 



