INSECTS AFFECTING PARK AND WOODLAND TREES 



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Broods in New York State. The life cycle of this insect is c<)ini)leled 

 in 17 \i';irs and yet it appears in some portions of New York State at 

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

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

 different years. These appearances have been very closel)- followed by 

 entomologists during the latter half of the last century at least, and some 

 records include much earlier dates, so that the periodicity of this insect is 

 established bcyoml all question. Dr Fitch in 1S56, records g broods as 



Fig. 43 Map showing the distribution of the broods of the 13 year 

 Dep't Agric. Div. Eiit. Bui. 14, n. s. 1898. ] 



occurring in the different parts of the United States, and mentions 3 as 

 appearing within the borders of New York. Dr Lintner stated in 1885 

 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 New 

 York State are briefly as follows : 



