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JOURNAL OF ECONOMIC ENTOMOLOGY 



[Vol. 4 



sented by seventy-two and forty-six weevils respectively, l^rcd from 

 the earliest and latest eggs of the original hibernating weevils. The 

 lots of squares from which they were reared were small and the factor 

 of food condition had a large effect in retarding the development. 

 In addition, the earliest period is represented })y weevils reared before 

 the best methods of keeping infested squares were found, and these 

 weevils were therefore further retarded by this extra deleterious effect 

 on their supply of food. The average developmental periods in the last 

 three periods were also considerably increased from the normal by the 

 poor condition of the squares used late in the season. These threfr 

 periods were also represented by rather small numbers of weevils. 

 Also, the sixth period is represented only by weevils reared from the 

 earliest eggs of two lots of weevils and hence from small lots of squares. 



TABLE IX 



RELATION BETWEEN LENGTH OP DEVELOPMENT AND TEMPERATUBB 



Comparative Duratioji of Developmental Period in Males and 



Females 



Before the work had progressed very far it was noticed that, in 

 general, a relative majority of the earliest weevils reared from the 

 different lots of squares were females and that the percentage of 

 males increased as time passed. A summary of the records in this- 

 respect shows the following: of the 86 lots of squares, the females 

 had the shortest average development in forty, the males in twenty- 

 two, from ten lots only females were reared, from seven lots only males, 

 and in seven cases the developmental period for both sexes was the 

 same. The weighted average developmental period for the 475 

 males reared was 13.88 and for the 393 females 13.49 days, a difference 

 of 0.39 days. 



A summary of the figures based on oviposition days is given in 

 Table X. 



