Analysis of Heteeogeneity in the Population 319 



10 14 9 11 14 





31--J^ 

 \^ 21 — 





22 ^^) (^^^ 214 



^. 311 



fi^ 214 



4^V 171 



^ loe 



88 ® ^k- 166 



<^) 341 



^^) 207 



(^ 2C0 



@^ 104 



Q^ 97 



^232^- — 81 



1898 Males. Total 3329. 1431 Females. 



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

 pattern. 



I 7 4 



/ 

 9- ®^^^ j^^ / ^ 106 



31- 



86—--^^ ^ 71 



r..^ 45 (^ ^ 217 



^^ 111 



73-— <ijM>j) (^ 15, 



^) 411 



<§M0 131 



M^ 56 



\B 44 



(^ 192 



^ 219 



4Sj> 155 



/^. 143 



(55) 76 



1090 Males. Total 2682. 1592 Females. 



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

 pattern. 



8 51 11 

 9"(^\\\ 8-^ 



14 



r.^ 



^ ^ 9 11 (^ ^ 



^ 9 



_ 56 



11 -^ij}^ ^ 41 31 J^ ^ 44 



31 — -^m ^^ ^ 42 -^ <^- ' 



^ 77 ^j j^ 



^ 55 ^ ^ ^^ 



®- 88 



55 



482 Males. Total 1054. 572 Females. 



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

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



