19111 



Notes on the Colorado Potato Beetle 



F9 



3. Mating. 



The observations on this habit are also limited, but those 

 matings actually observed are summarized in Table VII. 

 In a single ease, the time actually involved from beginning to 

 end of the act was obtained, being three and one-half hours 

 (10:30 a. M. to 2 p. M., June 18, Pair No. 3, hibernated adults.) 



TABLE VII. 



Frequency of Mating in Reproducing Pairs. 



Different Generations, 190S. 



• Male escaped. t Male died July 26. t Male entered soil for hibernation. 

 ° Only observed mating; hibernation followed within 10 days. 



Mating was observed during the following hours of the day: 

 Practically at any hour between 7 A. M. and 11 p. M., more 

 commonly at 9, 10 and 11 A. m. and 1, 2, 3, 4 and 6 P. M. or 

 at fractions of those hours. The function was observed most 

 commonly at 9 and 10 A. M., over 31 per cent of the 58 times 

 the act was observed being either at or between those two 

 hours. Fifty per cent of the observed matings occurred in the 

 morning and fifty per cent, in the afternoon or evening. Ob- 

 servations were continued throughout most of the night, up 

 at least until midnight, commencing again at six o'clock in 

 the morning. 



