8 BULLETIN" 598, U. S. DEPARTMENT OF AGRICULTURE. 



Table II. — Time of emergence of adults of the hickory tiger-moth at North 



East, Pa., 1016. 



Date of emergence. 



Total 

 number 

 of maths. 



Number 



of 

 males. 



Number 



of 

 females. 



Date of emergence. 



Total 

 number 

 of moths. 



Number 



of 

 males. 



Number 



of 

 females. 





1 

 1 



4 



8 

 4 

 3 



1 

 1 

 3 

 7 

 3 

 2 





June 10 „ 



1 

 1 



a 

 i 





1 



10 





19 







12 



i 



l 

 l 

 l 



22 





1 



13 



24 





1 





Total 







15 



25 



17 



8 









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 larvse reared by the writer on Japanese walnut required from 

 62 to 85 days from egg to cocoon, averaging 71.73 days. (See 

 Table III.) 



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



Number of 

 individuals. 



Duration 

 of larval 

 feeding 

 period. 



Number of 

 individuals. 



Duration 

 of larval 

 feeding 

 period. 



j Number of 

 individuals. 



Duration 

 of larval 

 feeding 

 period. 



1 

 1 



1 

 1 



1 

 1 



Days. 

 62 

 64 

 66 

 68 

 70 

 71 



1 

 2 

 1 

 2 

 1 

 3 



Dais. 

 72 



74 

 75 

 70 

 77 

 78 



2 

 2 

 1 

 1 



Days. 

 79 



80 

 82 

 85 



22 



i 74. 73 



1 Average. 



During the season of 1916 larva? 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. 



Number of 

 larvae. 



Duration 

 of larval 

 feeding 

 period. 



Number of 

 larvae. 



Duration 

 of larval 

 feeding 

 period. 



j Number of 

 larvae. 



Duration 

 of larval 

 feeding 

 period. 



3 

 2 

 4 

 9 

 G 

 21 

 4 



Days. 



80 

 82 

 83 

 84 

 85 

 86 

 87 



15 



31 

 26 

 4 

 6 

 8 



Days. 

 88 

 89 

 90 

 91 

 «2 

 93 



2 

 2 



1 

 1 



145 



Days. 

 94 

 95 

 96 

 100 



189.04 



1 Average. 



