400 THE AMERICAN NATURALIST [Yol. LVI 



phila is, to the nearest whole figure, 97 days. To de- 

 termine it for white males we have Table I, calculated 

 from Glover's Table 9. 



I Beqistration States ok thx 



From this it appears that there is almost exactly one 

 survivor at 98 years. So then we have as biologically 

 equivalent life spans 



97 days of Drosophila life as imago = 86 years 



