Analysis of Heterogeneity in the Population 



275 



biotyp«s 10 and 11 were separated by slight gaps, and in the females the extreme 

 end of biotype 8 was wanting. 



The second generation in this season showed the nearly complete development 

 of all of the lines in the population, no biotypic groups being absent, and none 

 separated from the mass of the population by discontinuities of any sort. This 



f'i^'^^'i^ 



92- 



141- 



77 ^^^ 



86 ^ 



107 



79 



81 



4M134 





%m9^—22 141 

 -84 

 -71 



50 22 18 



& 



^'—18 





imi'-w — ^^^ 



,^-;*r-- 36 



i^p'- 219 



|*W'; : v^'^Kr 417 



"'7^;;,;^^-: 209 



/ \ 'b*^<?ii 44 



95 _^5j 



44 '"-*■ 



186 



210 



/ 

 12 



- ^ JSfe 310 



*W< «tt- 444 



''W^ M 199 



2289 Males. Total 4507. 2218 Females. 



Fig. 60. — Census of first annual generation at Chapiiltepec colony In 1907, 

 •howingr great difference in the array presented by the two censuses In the pronotal 

 pattern and also different from those present In the preceding censuses. 



42 -^ K. 



64 -'■r'';jl^:::-i 



106 ^^^%.'^'-. 



77 >^- '\ 



191 -^f 



188 -'--W ' 



314-—-- ^ 



14 42 31 



im^i^ — 88 



■' !^ 140 



^ 126 



:^ 141 



m 419 



60-||jKi^ 



88--^||«S 



9i-||ji 



50—-?;-- -j 



141 --- 



45 



211- 

 416- 



-•mo 





--541 



98 





m 



^ 



I 



1^. 



17 18 46 



11 19 74 

 3170 Males. 



12 31 41 4 



Total 6782. 3612 Females 



12 44 31 



^-19 



M- --81 

 4ij|tr 59 



p^4:^ — 198 



r^j 241 



219 



341 



461 



.^. 214 



V ^ - - — 196 



\ ,*-^-. -— 45 



\ \ ■<^- 8 



12. 60 



Fig. 61. — Census of second annual generation at Chapultepec colony in 1907. 

 The population was numerous and showed nearly the complete array possible for 

 the pattern in the population. Only a few of the extreme members in each of the 

 general lines are absent. 



condition in the population is not often attained at any location in this species, 

 and appears apparently only under the influence of optimum conditions in the 

 climatic complex. The findings in the two censuses of the season of 1907 

 are shown in figures 60 and 61, the conditions of the climatic complex in 

 climatic record 4. 



