Drosophila Melanogaster. 293 
The buff females and the tinged-buff compounds are practically insepar- 
able. The two classes of males can be separated into buff and tinged males 
but are here classified together. The wild red eyed form did not appear in 
the F, or F, generation. The IF, males and females show a slight variation 
in color although we were unable to separate the two on a color basis. 
(b) Buff by Tinged 9 
P. whuXO . wtwtXxX 
KF, wtwbux x wt. 
(1) 30 31 
(2) 256 200 
(58) 85 
The tinged males and the tinged-buff compound females of the F, are in- 
separable on a color basis as one might expect since the two colors are sep- 
arated by such a small margin. 
F, wiw'X xX wtwbuX X w'XO whuxXO. 
iL yee Bia pt 72 48 
2: Baas ee ee 127 103 
Ba le at a 113 65 
ANS J 25 GAS Pee ae 242 186 
Be so oe 68 47 
(Ot ee eee ee 112 82 
DP Ob oe de 734 93.1 
The F, males can be separated with difficulty. 
2. Linkage of Buff and Blood. 
(a) Buff 2? by Blood. 
P. whtwxXxX . wXO 
FF, wbuwbXX wbhuXO 
202 198 
F, Females compounds uniform deep red—males like buff. 
i105 whbuwbuX X wbhuwbX X wbhuXO wbhXO 
LSI 9 etalon a Pe cae a Hl ae, 50 69 
(AS a, 275 SS Pes i rane toca 45 46 49 37 
ESP eee en does alin ts 130 148 117 119 
6 a ia ae Wa ee oe 158 154 168 139 
PROTA SE maton, es 384 418 384 364 
Males and females in the F, are easily separated into the different classes. 
