126 SEX INHERITANCE 



and in behavior, varying from almost normal 

 females at one end of the series to forms that ex- 

 ternally are about like the normal male. Not only 

 are the wings in extreme cases colored hke those of 

 the normal male (with, however, occasional flecks 

 of white like the female), but the size and diverse 

 parts such as the antennae, the hair, the genitalia, 

 and even the gonads are mosaics of male and female 

 characteristics. 



These relations are more interesting when crosses 

 involving different Japanese races are compared. 

 When Jap. G. male is crossed to Jap. K. female, 

 all Fi daughters are slightly intersexual or male- 

 like. When Jap. H. female is crossed to Jap. G. 

 male, the daughters are somewhat more like males, 

 but their instincts are female, and they attract 

 males. The copulatory organs are so changed in 

 the direction of the male that mating is unsuccess- 

 ful; and eggs can not be laid, although character- 

 istic hairy sponges are made to receive them. 

 When Eur. F. female is mated to Jap. G. male, 

 the daughters are more than half-way .transformed 

 into males. The secondary sexual characters are 

 almost male. The instincts and behavior are about 

 intermediate between those of the male and female 

 of the two normal races. Males are scarceh^, or 

 not at all attracted, and no mating occurs. The 

 copulatory organs show the strangest combination 

 of male and female types. There are still typical 

 though rudimentary ovaries. When Jap. X female 

 is crossed to Eur. F. male, a still higher degree of 



