THE CODLING MOTH IN MICHIGAN. 



49 



ever, the pupation period was longer. From the records of emer- 

 gence of moths we ibid that the earliest pupae must have appeared 

 about June 30 and the last pupa 1 about August 24. 



Length of pupal stage.— In the course of rearing work two separate 

 tests on the length of the pupal stage have been made. One of these 

 (Tables XLVIII and XLIX) includes primarily observations on 

 the pupal stage; the other (Table LV) contains observations on the 

 life cycle of the insect. The results of Table XLVIII, including 132 

 insects, show that the period varied from 6 to 21 days, with an aver- 

 age of 14 days. The results from the life cycle series (Tables LV 

 and LVI), covering 75 observations, showed a variation of 11 to 24 

 days, and an average of 15.18 days. 



Table XLIX. — Length of pupal stage of the summer brood, Douglas, Mich., 1911; 

 summary of Table XL VIII. 



Table L.- 



Time of emergence of moths of the summer brood from band records, Douglas, 

 Mich., 1911. 



