144 



DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



of the female was 44. 3 days, or 2.5 days longer. In summarizing the 

 two series we find that the earliest pupa occurred March 2, the latest 

 pupa May 11, the earliest adult April IS, and the last adult June 11. 

 The shortest pupal stage was 30 days, the longest 56, and the average 



March 



April 



May 



FIG. 32.— Diagram showing pupation of spring brood of larvse, 1911. (Original.) 



42.4 days. From the total adult emergence record (fig. 33) it will 

 be seen that the earliest adult emerged on March 24 and the last on 

 June 20, so that by using the average pupal period the earliest pos- 



FiG. 33.— Diagram showing emergence of mollis; overwintering brood of 1911. (Original.) 



sible pupa must have occurred about February 9, and thus the theo- 

 retical span of the pupal period included the time between February 

 9 and June 20, or 131 days. Tables XXVIII and XXIX show, 

 respectively, the pupal stages in the capsules and vials. 



