82 Annals Entomological Society of America [Vol. IV, 



when they were killed and removed. Of the remaining five 

 adults, two had died by August 11 and the three others hiber- 

 nated on August 22. (5) Batch e, 56 eggs, came to larval 

 maturity at the average time of 11 p. M., July 25, and gave 



24 adults from August 4 to August 6, which were confined 

 together with food. But a single pair was isolated, observed 

 mating on August 1 1 , though previously, mating had occurred 

 promiscuously. This pair was neglected after isolation and 

 no further reproductive activity occurred; on August 13 at 

 9 a. M., the male entered the soil for hibernation and on August 



25 the pair were removed still alive. Of the remaining 22 

 beetles, 4 hibernated on August 11 at 9 A. M. and by August 

 22, all had disappeared beneath the soil, two having died 

 there. No reproduction, but during the period of feeding, after 

 several days, mating was frequent and promiscuous and there 

 is good reason for believing that reproduction was prevented 

 by actual starvation at a critical period. ((>) Batch/, 32 eggs, 

 arrived at larval maturity at the average time of 6 A. M., July 

 27, and gave 4 adults August 7 and 8; on August 11, 

 a mating pair of this lot were isolated and the remaining two 

 also paired. The first pair mated again on August 13 and 

 August 14 but no oviposition followed and they were removed 

 on August 25, after days of starvation. The second pair 

 had hibernated by August 22, without depositing eggs and 

 with no further observed matings. 



In general it may be stated that the adults of the second 

 generation just after emergence fed voraciously for several 

 days and then began to mate as though eager to reproduce and 

 one pair acutally deposited fertile eggs, insuring at least a por- 

 tion of a third generation. It was at this time in their lives, 

 just following the period of heavy feeding and the beginning 

 of mating that stress of other work caused the food to be neg- 

 lected and after August 8, the beetles were starving and were 

 forced to hibernate. Incidentally, it was also true that their 

 food-plant in nature was also very scarce at this time, so even 

 if at large, it is not unreasonable to suppose that these beetles 

 of the second generation would have been forced into hiberna- 

 tion before reproduction could begin, though willing and able 

 to reproduce. What little evidence we have gathered this year 

 forces us to conclude that the second generation of adults 

 exceptionally are both willing and able to reproduce, merely 



