AX APTEROUS MUTATION IX BRUCHUS. 



169 



number of progeny manifested in apterous mat ings, it is very 

 pp.li.il>le that there must be some defect of the genital organs of 

 the apterous females because (Table I.) of the nineteen pairs of 



TABLE I. 



:i i i TE BREEDING RECORDS FOR APTEK 



indicated below as all winged with no ai 

 v both winged and apter< 



* It .ill winged pairs in Fi with Fj offspring. 



aptiTou- iVmalrs mated only four produced offspring. Two of 

 tlu-M- urn -in-le pairs of the first seven apterous mutations: 

 P.iii> J .m<l 6 respectively. The other two apterous p,u'i> \\ere 

 l>iv<l a- m.i cultures and they produced offspring. Aside from 

 thi- apparent sterility, it is possible that the genitalia of the 

 fi-iualr is too Mnall for the male to copulate with the female in 

 r\ rry in-tan. 



