Analysis of Heteeogeneity in the Population 301 



In the season of 1907 the first generation showed a curious reduction of the 

 line composed of biotypes 1, 2, 3, and 4 ; 1 and 3 were entirely absent in the 



4 29 31 19 -^\ 9 21 44 



! ! / ^-7 81— m \ I / 



^ I I ' iuC _ 22 33-— ^ ' ' '' -,-, 



m' V-53— -.63 21 -— ^ ^ ^Xr^— 77 



mm 74 ^ *<* '^ — 81 



-^ HM< -- 14& 109 m m --121 



*f^ *h. 219 108 



JSS* *h- 196 



«* ^i<^ 314 ''^ ^31 



, iM* -ri^ 198 



/ \ •¥?' --—85 

 / •>/ 46 



^ ^evV - 219 



97 

 46 



\ OC? 9 



19 



1955 Males. Total 4221. 22G6 Females. 



IS of first anni 

 :onditions pres 

 amount of fluctuating variability 



Fig 105 — Census of first annual generation at Puebla in 1906, showing same 

 array of pattern conditions present in figure 104, but somewhat decreased in 



18 8 31 44 



1787 Males. Total 3695. 1908 Females. 



Fig. 106. — Census of second annual generation at Puehia in 1906 showing a 

 restriction in the array of pattern conditions, the appearance of isolated groups 

 and increased fluctuation in the line composed of biotypes 1, z, 6, ana 4. 



males, while 1 was present and 2 and 3 absent in the females. The same condi- 

 tion prevailed in the second generation of this year, where biotype 1 was present 

 in both sexes, but 2, 3, and most of 4 were absent, as were also 10, 11, and 12 in 



