Analysis of Heterogeneity in the Population 319 



10 14 9 11 14 



\ \ 



'M "-"^ / 



^y. 341 ^_ ^^^ 



^VU) 207 ^■' 



^m 2C0 zl^ 



^V^ 104 ^^^ 



^u^ 81 



1898 Males. Total 3329. 1431 Females. 



Pig. 138. — Second annual generation at Chicago in 1902, showing the pronotal 

 pattern. 



I 7 4 



/ 



»--<&' \^ j,...^ / ®— 106 



^^L / ^ 170 



111 



73 i^}^ (^ 151 



45 ^ ^ 217 



^) 411 



^ 131 



<Sm|^ 56 



^ 44 



44 ^ ^- 44 



<^ 192 



^^ 219 



^g^ 155 



^- 143 



Q^ 76 



1090 Males. Total 2682. 1592 Females. 



Fio. 139. — First annual generation at Chicago in 1903, showing the pronotal 

 pattern. 



8 51 11 



^ ^ 9 11 (^ ^ ^ 5g 



11 -^ ^ 41 31 J^ (^ 44 



S1-- -^ ^^ 36 ^ ^ (^— 89 



77 



42 



^L— 106 



,^^ 55 ^1 ^ ^^ 



(^ 88 ^^ 55 



^gsl 22 



@> 27 



<^--14 ^i^— 11 



482 Males. Total 1054. 572 Females. 



Fia. 140. — Second annual generation at Chicago In 1903, showing condition 

 in population and existence of isolated groups in biotypes 3 and 4. 



