THE CRANBERRY GIRDLER, 9 



Table II. — Number of eggs per female of the cranberry girdler, Whitesbog, 



N. J., 1915. 



Pair No. 1: 



Pair No. 2. 



Pair No. 3. 



Pair No. 4. 



Date of deposi- 

 tion. 



Number 

 of eggs. 



Date of deposi- 

 tion. 



Number 

 of eggs. 



Date of deposi- 

 tion. 



Number 

 of eggs. 



Date of deposi- 

 tion. 



Number 

 of eggs. 





7 

 98 

 30 

 12 

 14 





1 

 1 

 1 



6 

 17 

 59 

 75 



May 22.. ^ 



May 23 



May 24 



May 25 and 26 



May27 



May 28 



79 

 103 





 32 



9 

 12 



July 24 



July 25 



July 26 



July 27 



July 28 



July 29 



July 30 



July 31 



55 







8 







78 







21 



June 13 





49 







3 







17 







12 





161 



160 



235 



243 



The greatest number of eggs laid in a single day by one female 

 was 103, and the greatest number laid during the life of a given 

 female was 243. The length of the egg stage varies with the season, 

 those eggs deposited in May requiring a longer incubation period 

 than do those laid in July, as shown in Table III. 



Table III. — Length of the egg stage of the cranberry girdler, Pemberton and 



Whitesbog, N. J., 1915. 



Date of deposition. 



Date of hatching. 



Length of 

 stage. 



Date of deposition. 



Date of hatching. 



Length of 

 stage. 







Days. 



18 



17 



16 



18 



16 



18 



7 



8 



7 



8 







Days. 



7 



May 22 . . 



..do 



Julv 26 



do 



6 



May 23 . 



..do... . 



"Do 



Aug. 2 



7 



Do 



June 10 ' 



July 27 



Aug. 3 



7 



May 26 . . . . 



July 28 



Aug. 5 



8 





June 17 



July 30 



Aug. 6 



7 





.do... 



July 31 



do 



6 









Aug. 13 



6 





do 



Aug. 9 



Aug. 15 



6 



July 24 

















Average length of the egg stage, 9.63 days. 



LARVA STAGE. 



The larva leaves the egg through a hole which it cuts in the apex, 

 or slightly to one side of the apex, and emerges as soon as the aper- 

 ture is large enough to permit the passage of the head, crawling 

 rapidly out and appearing very active at this period. In small cans 

 the larvse were fed fine cranberry roots, the bark and wood feeding 

 habit being acquired apparently during later life. As remarked by 

 Ainslie (12), some species of Crambinae defy all attempts to rear 

 the larvse, and C. hortuellus falls into this class in the experience of 

 the writer. 



88633°— Bull. 554—17 2 



