164 Annals Entomological Society of America [Vol. I, 



July 22nd, when two mated pairs were removed to comprise the 

 pairs of the first generation. The remaining 7 beetles of both 

 sexes were fed until 10 a. m., July 27th, and then left to starve, 

 and the soil in the jar allowed to become hard and dry. On 

 the morning of August i ith, drops of water were added to the soil, 

 and some of the adults drank of it ; two of the beetles were then 

 buried just below the surface of the earth. Nearly two months 

 later, September 20th, three of the beetles died, and were found 

 lying on the surface of the soil, which was now hard and caked, 

 though it had been moistened from time to time. On September 

 25th, one adult was alive on the surface of the soil and the other 

 three were exhumed alive; the soil was then dry and compact, 

 but was again moistened from above on that date. The exhumed 

 beetles again entered the soil; the one remaining above died on 

 October 3rd. On October 17th, the three adults remaining were 

 again exhumed alive and replaced on top of the soil, which they 

 soon re-entered. Finally on November ist, they were carefully 

 examined and found in apparently good condition. They were 

 placed on fresh, sifted soil, together with the male of Pair No. i 

 of the hibernating individuals, allowed to enter it, and the jar 

 containing them was placed in a place suitable for hibernation. 

 They finally emerged on February 26 (i), April 7 (i) and April 

 II (i), 1 90S, and are alive today (April 30, 1908). 



Summarizing, the 7 beetles of mixed sexes lived as follows, 

 after feeding was discontinued: 3 lived from July 27th to Sep- 

 tember 20th, or 55 days; i lived from July 27th to October 3rd, 

 or 68 days; the remaining three lived at least until April 30, 1908, 

 or over. 



It is to be remarked that no reproduction occurred after food 

 was discontinued, though a few eggs were deposited on July 23rd, 

 during the period of feeding. As is to be expected none of the 

 adults were observed mating either. 



2. Length of the Period of Ovipositton. By consulting table 

 II, in which is given the number of eggs deposited by pairs of 

 difi'erent generations in 1907, it is seen that the period of oviposi- 

 tion varied considerably for each generation, and was very much 

 the longest for the pairs of the hibernated individuals. The 

 table below makes the difl'erences more apparent. 



The period had a range of from 3 to 85 days, according to gen- 

 eration. Tower (1906, p. 237, table 104) gives the average 



