THE CODLING MOTH IN MICHIGAN. 



17 



FIRST BROOD OF PUP^E OR SUMMER PUPJE. 



Time of pupation. — The time of pupation may be determined from 

 the records of the pupal stage and the emergence of moths of the 

 same brood (see fig. 11) since it is to be expected that the rate of 

 pupation approximates that of the emergence of the moths resulting 

 from these pupse. 



Table XIV. — Length of the pupal stage of the first brood, Douglas, Mich., 1910; sum- 

 mary of Table XIII. 



Length of pupal stage (Tables XIII and XIV). — The pupal stage 

 of the first brood varied from 9 to 25 days with an average of 13.6 

 days. The experiments of Table XIII include observations taken 

 during the greater part of the pupal period. 



Table XV. — Time of emergence of moths of the summer brood from band-collected mate- 

 rial of 1910. 



