20 



In conclusion, I will mention that of 62 cocoons, gathered at 

 random off oaks, 61, or 82%, produced Tnrtrix viridana. Three 

 female pupae of this species produced hymenopterous parasites and 

 one pupa died. Thus nearly 89% of the pupa gathered belonged to 

 the green Tortrix. The first emerged June 8th, the last June 18th. 

 The sexes were equally divided in the 34 instances noted. Of the 

 remaining seven pupae, four yielded Pandeiiiis ribeana, one, Tortrix 

 loeflhujiana, one, Cacoecia lecheana and one, Gypwnoma dealbana, 

 all belonging to the Tortricina. 



The dates of the appearances of the various stages of this insect 

 will vary from year to year in sympathy with the advanceinent or 

 retardation of the Spring and also in accordance with the latitude 

 of the locality investigated. 



