30 BULLETIN 417, U. S. DEPAKTMENT OF AGRICULTURE. 



Table 4. — Record of eggs deposited by five -pairs of Calosoma scrutator, 1909. 



Date. 



Pair 

 No. 

 1772. 



Pair 

 No. 

 1786. 



Pair 



No. 

 1787. 



Pair 

 No. 



1789. 



Pair 

 No. 

 2704. 



Date. 



Pair 

 No. 

 1772. 



Pair 

 No. 



1786. 



Pair 

 No. 

 1787. 



Pair 



No. 

 1789. 



Pair 

 No. 

 2704. 



June 14 

 17 

 18 

 19 

 20 

 21 

 22 

 23 

 24 

 25 

 26 

 27 

 28 







42 

 1 

 18 

 30 

 10 

 42 

 57 

 22 

 14 

 11 

 3.5 

 30 







June 29 



30 



July 1 



2 



3 



9 



15 



16 



19 



Aug. 1 



11 



Total.. 





7 



52 

 19 

 2 

 11 



20 

 2 



""26" 



24 



"4' 



36 



1 























1 



15 

 67 

 40 

 27 

 9 

 2 

 31 



25 

 13 

 33 

 19 



"l9" 

 3 



4 

 4 



1 









38 

 '"68" 



"*46' 



4 



'"io 



17 



""is" 



8 















11 







0) 











17 



0) 











C 1 ) 







( 2 ) 







161 



84 



396 



234 



177 









1 Female died. 



2 Female entered hibernation. 



After the females had ceased oviposition at the end of the season 

 the males in each of the four jars died. They were replaced with 

 males from the same shipment, but all the females died soon after, 

 except one (No. 1789) which entered hibernation and again laid eggs 

 in 1910. This female deposited 26 fertile eggs in 1910 and died during 

 the summer. Table 4 is inserted to show the duration of oviposition 

 each year and indicates the large number of eggs sometimes deposited 

 by a female in a single day. 



The total number of fertile eggs deposited by two females in 1910 

 was 81. There were other females in stock but they did not deposit 

 eggs. Other beetles received during the first days of June and July, 

 1911, did not deposit eggs that year. 



LONGEVITY. 



One female that was received from Washington, D. C, May 18, 

 1909, lived until July 21, 1910. This adult reproduced in both 1909 

 and 1910 and a few other specimens lived as long as this female, but 

 no record was kept concerning reproduction. The age of these beetles 

 was unknown at the time they were received but most of the speci- 

 mens lived two years in confinement. 



It is probable that the length of life is considerably greater under 

 natural conditions. 



HIBERNATION. 



The notes at hand on the hibernation of this species present some 

 great variations as to the time of entering and emerging. Of the 

 beetles received in the spring of 1909, those that lived until the fall 

 entered hibernation between September 8 and October 12. The first 

 female of this lot emerged May 9, 1910, and one on each of the follow- 

 ing dates: May 26 and June 4, 12 and 16. One male emerged June 

 30. The depth of the cavity of only one female could be determined 

 and this was 1 inch below the surface. 



One pair of beetles collected at Onset, Mass., during August, 1909, 

 reproduced during the latter half of September and entered hiberna- 

 tion October 8. The female died during the fall or following winter 

 and the male was unearthed from a cavity 9 inches deep in the hiber- 

 nation cage June 23 the following summer. 



