2 Female Families in Abraxas 



Of these males, one (mating '09. 12) proved to be homozygous for gros- 



sulariata, a second heterozygous ('09. 7), and from the third no images 



were reared. From the two successful matings with grossulariata 



males, the results were 52 (/*, 25 ? and 42 (/, 25 ?. The matings with 



lacticolor males were '09. 8, which yielded 11 J", 15 $ ; '09.15, one female 



only; and '09.18 with 11 females. The single female from '09. 15 was 



paired with a lacticolor male from '09. 7, but laid no eggs ; of the 



eleven females from '09. 18 all were paired, but three produced hardly 



any eggs and no larvae (two of the males used in these infertile matings 



were lacticolor from '09. 8, the third a grossulariata from '09. 12, i.e. all 



were sons of females of the unisexual family '08.2). Of the eight 



fertile pairings, two (^10. ^1, '10. 24) were with lacticolor males ; the 



male of '10. 21 was unrelated and from 80 eggs 24 females were reared, 



with no males; the male of '10. 24 was from '09.7 (son of '08.2) and 



from 100 eggs were reared 22 </, 25 J. Of the six fertile pairings 



with grossulariata males, one ('10. 19) was with a wild male and gave 



from about 75 eggs 25 (/*, 20 $ ; two were with homozygous gross. 



(unrelated) males and gave from 56 and 80 eggs 21 ^, 23 % and 4^/', 5 $ 



('10. 25 and '10. 27). The other three were with heterozygous gross. 



males; in one ('10. 15), in which the male was unrelated, 32c/' and 27 % 



were produced ; the other two, '10. 22 and '10. 28, in which the male in 



each case was from '09. 12 (sons of '08. 2\ produced from 19 and 91 eggs, 



4 $ (3 gross. 1 lact.) and 62 $ (34 gross. 28 lact). In these last matings, 



purely female families including grossulariata as well as lacticolor were 



produced for the first time. 



Another important point arose from the 1910 matings. A lact. 

 female of '09. 8 (a bisexual family, whose mother belonged to the 

 unisexual family '08. 2) was paired with an unrelated lact. ^, and 

 produced 69 ?, 4</' ('10. 17), and in another family (10. 10) descended 

 on both sides more or less nearly from unisexual families (see Table of 

 Matings) 14 $ and 2(/' were produced. The 1910 pairings showed 

 therefore (1) that there is apparently some tendency to infertility 

 among females of unisexual families, at least when mated with related 

 males; (2) that unisexual families including grossulariata individuals 

 can be produced ; and (3) families with enormous preponderance of 

 females were reared from parents which belonged to normal broods 

 themselves, when one or both were descended from unisexual families. 



It is not necessary to describe in detail the matings made in 1911 ; 

 the results of those which are important for the present purpose are 

 given in the table. It will be seen that of twelve matings with females 



