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Annals Entomological Society of America [Vol. I, 



in the afternoon, but on July 6, twice in the afternoon; mating 

 was observed at the following hours of the day: 3 p. m. (May 31) ; 

 noon (July 15) ; 4 p. m. (May 29, July 21) ; 2 p. m. (June 5, Aug. 6) ; 

 10 A. M. (July 22); 11:30 A. M. (July 22); II A. M. (July 24); 4 

 p. M. (Sept. 5) ; 7 p. M. (Sept. 5) ; the observations seem to show 

 that mating occurs as frequently in the morning as in the after- 

 noon. The table also shows the relations between mating days 

 and period of mating to period of oviposition and number of egg- 

 masses deposited. 



* Male entered earth, July 2. t Male died, August 16. % Male entered earth, p. m., Aug. 5th. 



• Male entered earth, a. m., August 7th. ® Began to hibernate, Sept 7th. 



4. Potency of Fertilization. No experiments were made to 

 test this directly, but in the case of Pair No. i of the hibernated 

 beetles some data have been obtained on it. Although the male 

 left his mate on July 2nd and buried himself into the soil, the 

 female continued to produce eggs until 2 p. m., August 24th, less 

 than four days before her death, and 52 1-2 days after having 

 been deserted by the male. During these 52 1-2 da^^s, she depos- 

 ited no less than 591 eggs or more than half of the total number 

 deposited by her during the season; these eggs were deposited 

 in 29 separate masses ranging from i to 60 eggs and averaging 

 20.3 eggs per mass; the daily rate of deposition for this mateless 

 period was about 11.2 eggs. The eggs were tested for fertility 

 at frequent intervals with positive results, and up until p. m., 



