1 84 Heredity and Euo^enics 



huge ])reponderance of the si'^iiaticollis l>pe. The census 

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

 following count: 



S']\;}ialuolii^ Type AI id-Type Undo:iriiUna]lii 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. 

 Xine pairs, taken at random, of the iindecivilineata typ^ 

 were bred out as pedigreed cultures during August and 

 part of September, 1905, and ga\'e uniformly an undecim- 

 liiicata progen)'. Se\'en pairs of the sigiiaticoUis type, 

 which were bred out, gave uniformly a signaticollis progeny, 

 and out of iive other pairs there appeared individuals of the 

 mid-tvpe and of the iindccimlineata t^'pe, showing that 

 some of the sigiialicollis t}'pe 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 pre})onderance of yellow 

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

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



The adults of Generation III emerged early in September; 

 a census made about the middle of Sei)tember ga\'e the 

 following : 



Si);ndlkollis Type Mi'.l-Type Undcximliiicala Type 



2,452 827 218 



