8 



BULLETIN 598, U. S. DEPARTMENT OF AGRICULTURE. 



TABLE II Time of emergence of adults of the hickory tiger-moth at North 



East, Pa., 1916. 



LENGTH OF EGG STAGE. 



The length of the egg stage, based on records from 4 egg masses 

 deposited in 1916, was 15 to 16 days. Two masses of eggs deposited 

 June 15 hatched July 1; one mass deposited the same day hatched 

 July 2 ; the fourth mass, deposited June 16, hatched July 3. 



DURATION OF LARVAL FEEDING PERIOD. 



The duration of the larval feeding period varies greatly. Miss 

 Soule (8) records rearing one colony from egg to cocoon in 47 

 days., which passed through only 7 instars. During the season of 

 1915 larvae reared by the writer on Japanese walnut required from 

 62 to 85 days from egg to cocoon, averaging 74.73 days. (See 

 Table III.) 



TABLE III. Duration of the larval feeding period, North East, Pa., 1915. 



1 Average. 



During the season of 1916 larvae reared on the same food plant 

 required 80 to 100 days, averaging 89.04 days. (See Table IV.) 



TABLE IV. Duration of the larval feeding period, North East, Pa., 1916. 



1 Average. 



