THE ELM-LEAF BEETLE IN NEW YORK STATE 



11 



numbers by May 12th. and oviposition began about the 25th, so 

 that the record of these two individuals is probably lower than 

 the normal as they may have deposited several clusters of eggs 

 before being captured. They were both supplied with fresh 

 leaves from day to day and the eggs removed and counted as 

 soon as detected. The female producing the smaller number of 

 eggs was confined, in a small, corked vial, while the other enjoyed 

 the freedom of a, jelly tumbler. The difference in conditions 

 undoubtedly had some influence on eg^ production and the pro- 

 tection from unfavorable weather conditions enabled the beetles 

 to approximate the maximum quota of eggs. The record is of 

 great value since it shows most clearly how long oviposition may 

 be continued by a single individual and the desirability of spray- 

 ing early in the season for the purpose of killing the beetles. 



^f^.-^.-:^ji^^^ 







Fig. 1. — Work of elmleaf beetle larvae. 



The young grubs emerge from the eggs early in June or in 

 about five or six days after oviposition, and soon begin to feed on 

 the under surface of the leaves, producing the familiar skeleton- 

 ized appearance well represented in figure 1, which is caused by 



