272 Sex Inheritance in Pediculus humanus var. corporis 



A. All three kinds of families have been obtained. Excluding 

 from consideration those broods in which the number of adults raised 

 is less than four, it will be noticed that there are two female, five 

 male, and three mixed broods, but in the latter there is a decided 

 preponderance of females over males, viz. 18 to 8. Another note- 

 worthy result is that obtained in N2, NS, and iV 5, where crosses 

 between adults from the same families in two cases produced male 

 broods, and in the other, a female one. It is evident, therefore, that 

 there must be two kinds of males, or two kinds of females, or two kinds 

 each of both sexes. 



TABLE IL 



Female from, a feraale faw^ily x male from, a mixed family. 



Number of 

 family 



M 1 

 M 3 

 M\^ 



N 9 

 ^10 

 i^l3 

 NU 

 Nil 



Female parent 



ex L 19 

 exL 19 

 ex L 19 



ex M 

 ex M 

 exM 

 ex M 

 ex M 



ex O 

 ex 



Male parent 



ex L 18 

 exL 8 

 exL 18 



ex M 8 

 ex ilf 8 

 ex ilf 10 

 exMlO 

 ex Mil 



ex 19 

 ex 19 



Number of 

 females 



Number of 

 males 



Sterile 



1 

 32 



37 

 37 

 12 



Sterile 



1(?) 



B. It is unfortunate that the one certainly mixed brood (P3) 

 contains but four individuals. The result, such as it is, resembles 

 that obtained in the preceding series, as regards the preponderance of 

 females over males in the mixed broods. With regard to the other 



