﻿STAEVATIOX AND SEX -RATIO 



2i 



G'-neratLun. 



First 



Second 



Third 



Fourth 



Fifth 



Sixth 



TABLE III.— History of Straix No. i5. 



Five Pairs. 



F 





F 



i 



S 



F 



1 



s 



! 



F 



i 



F 



! 



S 



1 



F 



s 



1 



Total Iniiividuah Sex-Rntio. 



Countid. Males: F' moles. 



434 



139 



289 



912 



1 : L09 

 (202 :222) 



1 : .25 



(4:1) 



1 : .78 



(78 :61) 



1 : .95 



(148:141) 



1 : 1.88 



(18:34) 



1 :1.34 

 (389:523) 



Seventh F 

 Total 



188 

 2009 



1 : 1.11 



(89 : 99) 



1 :1.16 

 (928 : 1081) 



Generation. 



First 



TABLE lA'. — History of Straix 4. 



Five /'airs. Total Individuals 



I Counted. 



41' 



Sex- Ratio. 

 M lies : females . 



1 : 1 40 

 (174 : 243) 



'Second 



(Fed Flies) 



Third 



Total 



90 

 507 



1 : 1.19 



(4^1^49) 



1 : 1.36 

 (215 : 292) 



