316 



The Mechanism of Evolution" in Leptinotaesa 



m--^ 





214 

 219 



'•"S^^mr 197 



■83 



/ ^^^ 



55 41 3g 5g 41 



818 Males. Total 1546. 728 Females. 

 Fia. 132. — First census at San Marcos in 1908, showing the pronotal pattern. 



^'Xn 



183--^ 



^^^^k 244 



1073 Males. Total 2263. 1190 Females. 



Fig. 133. — Second census at San Marcos In 1908, showing sudden change in 

 the population as a whole and sudden appearance of isolated groups in biotypes 

 6, 8, 12, and 10. 





87 



11— ^iv^; 



41 ^ 



15 — -J^ 

 7 1 



^I^JV^^fi^ 414 



■ / /:l'^ '•■•!>% 17 



/ / ^^\ \,i^ 8 



"'"*"■ 277 



51 12 



\ 



9 31 55 



1230 Males. 



17 — - 



61 X ^. 



60 i#> 



26 25 31 11 41 33 



92 



Total 2531. 1301 Females. 



Fig. 134. — First census at San Marcos in 1909, showing an increased array 

 in pattern conditions with total elimination of isolated groups present in the popu- 

 lation in previous censuses. 



