120 



ANNALS NEW YORK ACADEMY OF SCIENCES 



F> 



( FNb fNb Black 2 



J fNB fNb Barred $ 



( FNb fNB Barred 2 10 + 1 



! FNb fNb Black 9 6+1 



fNb fNB Barred $ 6 + 5 



fNb fNb Black $ 8 + 6 



Bach Mating s. — (5) The 6 black F x females used in (3) and (4) 

 were bred to a pure Barred Eock male and gave 9 barred young, fulfill- 

 ing expectation (fig. 3). 



FNb fNb Black 5 



fNB fNB Barred $ 



FNb fNB Barred 2 



fNb fNB " $ 



Fig. 4. — Cross of Laugshan £ to t\ barred J 



'(6) The 4 barred F x females used in (3) were bred to a pure Lang- 

 shan male. Of the 30 offspring, 14 were barred (1 # , 1 5 ) and 16 black 

 (0 $ , 3 2). This corresponds closely to the expected equality in ratio 

 (fig. 4), except for the possible barred female. The determination of 

 sex in this case was made on rather poorly preserved material. 



