184 Heredity and Eugenics 



huge preponderance of the signaticollis type. The census 

 of a random sample taken the last week in July gave the 

 following count : 



Signaticollis Type Mid-Type Undecimlineata Type 



1,244 1,192 367 



These individuals were not removed from the colony; 

 the census of the sample was made, the individuals put 

 back, and the colony allowed to encounter the conditions 

 and behavior which it would meet in a state of nature. 

 Nine pairs, taken at random, of the undecimlineata type 

 were bred out as pedigreed cultures during August and 

 part of September, 1905, and gave uniformly an undecim- 

 lineata progeny. Seven pairs of the signaticollis type, 

 which were bred out, gave uniformly a signaticollis progeny, 

 and out of five other pairs there appeared individuals of the 

 mid-type and of the undecimlineata type, showing that 

 some of the signaticollis type were hybrid in character. 

 Six pairs of the mid-type were also bred out as pedigreed 

 stock, and showed themselves to be in every case hybrid. 

 The third generation was produced in August and early 

 September, 1905. In this the larvae were of the same 

 four classes, but showed a huge preponderance of yellow 

 larvae (ylS). A count made late in August, when perhaps 

 the bulk of the larvae had entered into pupation, gave the 

 following results : 



Whs WhS ylS Yls 



205 227 849 321 



The adults of Generation III emerged early in September; 

 a census made about the middle of September gave the 

 following : 



Signaticollis Type Mid-Type Undecimlineata Type 



2,452 827 218 



