276 Sex Inheritance in Pediculus humanus var. corporis 



M4 M6 M4 Me Mio Me M4 Me 



M4 Mio Mia Me M4 Mio M4 Me 



Ni3 



Chart showing the ancestry of families P3 and P13. The nature of the family of 

 the parent is indicated in each case, ? ? signifying a female, c? «? a male, and 

 <f ? a mixed family. The experimental number of the family is also given. 



Of each pair, the female parent is on the left and the male on the right. 



