Analysis of Heteeogeneitt in the Population 319 



10 14 9 11 :14 



\\^ 31~® 



\^ 44--^ / 



'---^"^ ^ - i"-'^ m/^2 



iX—m> ^ 155 



^. '166 



20 eiies) fijSr 107 



22 ^ ^ 214 



<^ 341 " ^^ 



<L^ 207 ^^ 



ffljjjX 200 



-311 



^@- 214 



4g.v m 



^ 106. 



^. 104 



@| 97 



^n^ — 81 



1898 Males. Total 3329. 1431 Females. 



Fio. 138. — Second annual generation at Chicago In 1902, allowing the pronotal 

 pattern. 



1 7 4 



/ 



9— (^\W .....^ / ^—106 



65 'ST3' (cuiii oaji/i 111 



45 ^ ^ 217 



44 ^^ ^ 44 



^r 192 



^ 219 



4SS 155 



@^ 143 



(^ 76 



-12 



^ 411 



^h 131 



^^ 56 



1090 Males. Total 2682. 1592 Females. 



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

 pattern. 



8 51 U 



"--T®>\\\ 



14 

 / 





/ 



^ ^ 9 11 ^ m ^. 56 



U @ ^ 41 31 W> ^_ 44 



31— -^ ^ 36 



42- 



" <^ . 106 



@ 55 ^1 ^ ^^ 



^ oo ^^ ^ 



^gfl 22' 



^ 27 



^^-" ^^—11 



482 Males. Total 1054. 572 Females. 



Fi8. 140. — Second annual generation at Chicago in 1903, showing condition 

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



