1911] Heredity in Adalia 289 



part of the period, because just before the last three batches the 

 proportion was 16 melanopleura and 18 annectans, and the last 

 three batches gave 3 melanopleura and 10 annectans, thus mak- 

 ing a sudden change in the proportion. This male was in ail 

 probability pure annectans as there has not been found, in my 

 experience, any proven case of annectans carrying melanopleura 

 characters. The characters carried by the female could have 

 had no influence whatever in the results, since neither of the 

 characters carried by the female was dominant to the char- 

 acters carried by the male. Either the melanopleura or the 

 annectans characters of the male would realize themselves 

 whether they met an annectans or a humeral is character of the 

 female. These results approximately show that the melano- 

 pleura-annectans hybrids carry the characters in the proportion 

 of half and half. The somewhat high percentage of melano- 

 pleura obtained in these cases was more than balanced by the 

 extremely low percentage obtained in the case of the progeny of 

 the cage of melano pleura-annectans hybrids, in which case 

 melanopleura constituted less than half of the progeny when it 

 should have constituted three-fourths. The mortality in this 

 latter case, however, was so great that the data are hardly 

 sufficient. 



Another melanopleura female from melano pleura-annectans 

 hybrid parents after being fertilized by some of its melano- 

 pleura brothers was isolated for a few days, during which time 

 it laid three batches of eggs. From these eggs were reared 

 9 melanopleura, 3 humeralis, and 1 annectans. Excepting the 

 one annectans, this was just the right proportion for the progeny 

 of two hybrids according to the Mendelian law. This annectans 

 individual, (if it did not get in by mistake which was very 

 unlikely, great care having been exercised) must have been due 

 to fertilization by a melano pleura-annectans male probably 

 before the melanoplcura-humeralis male. The female was 

 then mated with a humeralis male and after that 14 adults 

 were obtained, G melanopleura and 8 annectans. The results in 

 this case seem to indicate that there had been a cross between 

 the melanopleura ancestors of this female and humeralis, while 

 still in nature and that in the first generation reared in captivity 

 the dominant melanopleura had kept it concealed, so that it 

 was not until the second generation that the crossing between 

 two hybrids happened to take place, -thus allowing the humeralis 

 character to appear. 



