Analysis of Hetbeogbnbity in the Population 



395 



Two censuses were taken in the season of 1907, with the results shown in 

 figures 94 and 95, where no difference in the character of the population was 

 found in either generation. There were now records of 8 generations without 



7 19 <S?-W 

 410 Males. 



15 



Total 815. 405 Females. 



Fio. 92. — Census of first annual generation at Chalcicomula In 1906, showing 

 a reduction of the array In population. 



411 Males. Total 875. 





/ V% 



11 14 



464 Females. 



79 



142 



63 



77 



Fie. 93. — Census of second annual generation at Chalcicomula In 1906, showing 

 marked reduction In the array. 



46- 

 27- 





\ 



3 5 19 



592 Males. 



Total 1141. 549 Females. 



Fig. 94. — Census of first annual generation at Chalcicomula in 1907, showing 

 a somewhat increased array of conditions in the pronotal pattern. 



625 Males. Total 1200. 575 Females. 



Fts. 95. — Census of second annual generation at Chalcicomula in 1907, showing 

 a marked reduction of the conditions in all lines with the exception of biotypes 8 

 and 9, Into which the majority of the population seem to have been thrown. 



trace of any of the behaviors found in the other locations, so at the end of this 

 year a large sample was taken to Chicago for testing in the laboratory, and there 

 were iatroduced into the colony in September 425 individuals at random from 



