INSECTS AFFECTIXC PARK AND WOODLAXn TREES 



235 



Broods in New York State. The life cycle of this insect is completed 

 in 1 7 years and )et it apjjears in some portions of New ^'o^k State at 

 much more frequent intervals. The reason is found in the fact that 

 several broods occur in the State. The adults of each emeroje in 

 different years. These appearances have been very closely followed by 

 entomologists durini;:^ the latter half of the last century at least, and some 

 records include much carher dates, so that the pcriodicit)' of this insect is 

 established be\-ond all (juestlon. 1 )r bitch in 1856, records 9 broods as 



Dep't A 



occurring; in the different parts of the I' nited .States, and mentions _^ as 

 appearing within the borders of New York. Dr Lintner stated in 18S5 

 that 5 broods were known to occur within the bounds of this .State. 

 Dr C. L. Marlatt in 1898 records 6 broods, one of these being based on a 

 doubtful record. The several broods which have been recorded from Xew 

 York State are briefly as follows : 



