sport in Melasoma and its Behavior in Heredity 23 1 



It is noticeable that the mosaic I noted in the previous genera- 

 tion (Table II) failed to recur. 



Table III, category a, shows AB again not breeding wholly true, 

 but predominating more extensively than in the previous genera- 

 tion; that is, there is relatively a larger number of wholly AB 

 broods. Its preponderance in mixed broods appears to be not 

 so great, though fewer mixed broods occurred. Here, again, as in 

 the previous generation, we find an absence of the S character 

 in the offspring. 



Extracted B, Table III, category b, that is B born of AB par- 

 ents, produces broods with the B type predominating (5 : i), and 

 in greater proportion than in the previous generation (Table II, 

 category d). The reverse might reasonably have been looked for 

 since in the latter case there were but two generations of AB 

 parents, whilst in the former there are three generations of AB 

 parents. It is in line, however, with the normal prepotency of B 

 over AB. 



Hybrid S (Table III, category c)\ that is, S from S xAB, a 

 cross that had produced only S offspring when mated with a simi- 

 larly produced individual, produced mixed broods of two kinds; 

 that is, broods of S and B, the S character predominating, or 

 broods of S, B and AB, the S character again predominating, AB 

 taking second rank and B occurring as a minority. It is possible 

 from the known behavior of S and B with relation to each other, 

 that B from hybrid S is but an offshoot from S and therefore 

 must in this connection be considered with relation to S only. 



Category d shows pure S (pure with reference to AB) again 

 completely dominating in the progeny of S xAB. 



Individuals of this generation ceased feeding in the laboratory 

 during the latter part of August, 1905, and were placed for hiber- 

 nation in a dark, cool, well-ventilated shaft connected with the 

 breeding room. They were isolated by broods. 



During the first week of March, 1906, the insects began to move 

 about in the cages. They were then brought into the breeding 

 room and feeding began. A large number of S individuals sur- 

 vived the winter, while but twenty-five AB survived. 



On March 5, 1906, matings were made in the following cate- 



