18 



Record of eggs deposited by two elm leaf -beetles.* 





Female in vial. 



Female in tumbler. 



Date. 



Clusters 

 of— 



Total. 



Clusters of— 



Total. 





(2) 







9, 9, 14 



29 







32 





 18 



42 





00 





18 



















18 



18 



26,21 



47 









15 

 20 



15 

 20 



4,26 



30 



June 8 (2 p.m.) 





27 

 3,31 



27 





20 

 23 



(3 p.m.) 20 

 23 



34 







June 12 









11,13 



31 



16,5 



28 



24 

 31 

 21 



28 



3, 7, 8, 11, 15, 19 



63 









14, 27 

 30 

 32 



41 





30 





32 













26,30 



2,6 



3,18 



2,20 



27- 



56 



8 

 21 

 22 

 27 



10,26 



36 



6,25 



4,31 



1, 2. 11, 7, 13 



36 





36 





31 





35 



June 23 



34 



























June 27 



5, 7, 9, 15 



36 



13, 21, 32 

 (dead) i, 17 



66 





21 

















*The examinations were made, as a rule, between 

 were seen in the afternoon they were recorded and the time indicated as in the table 

 ing on Sunday are in bold-face type, and as a rule no observations were made then 



30 and 9 a.m., although occasionally when eggs 

 The dates fall- 



It will be seen that from June 1 to 11 there were usually deposited 

 between 15 and 47 eggs every other day. The 12th, being Sunday, I 

 did not attend to the beetles, but from there being two or more clusters 

 found with each on Monday it is probable that one or more were 

 deposited the preceding day. The record shows that from either the 

 12th or 13th there was a marked increase in the number of eggs laid 

 from then until the 23d, there being as a rule from 8 to 40 deposited 

 daily. In the case of the one confined in the vial the record shows a 

 discrepancy which is greater than the facts warrant. I was unable to 

 attend to the insects on the 18th. Consequently it appears as though 

 two days during this period had been skipped by one beetle, and one 

 by the other, whereas it is probable that but a day passed without the 

 beetle in the vial depositing eggs and that the other really presents an 

 unbroken record iu this respect. During this short period of ten or 

 eleven days there were deposited over half of the total number of eggs 

 produced during the twenty-eight days a record was kept, the figures 

 being 238 and 338, or an average of over 21 and 30 eggs per day, 

 respectively. The average numbers deposited during the first eleven 

 days of the month are 14 and 18, respectively, which shows there was 

 an increase of one-half or more in the case of each beetle after June 11. 

 Those deposited after the 25th were apparently the last efforts of the 



