330 



The Mechanism of Evolution in Leptinotaesa 



14- 



18 ( 



24 



12 



9— — 



31' 



33' 



29-— 



16 



42 



-m 



■-m 



! Ti 



^ 11 



I ^ 46 



^ sr 



m 55 



m 61 



m> m 74 



' ^V 177 



51 



42 



14 



/ \ \ ^—-31 



11 4 9 



Population 850, First Generation. 



19 

 15 



20 -( 



31 



42 1^ 



14 ^ 



14 ^ 



19 



11 



5 



-m ^- 



! / / ^ m- 



/ / / \ ^ 



10 5 7 



Population 901, Second Generation. 



^-"1 

 (2m^— -12 



W> 38 



35 



40 



41 



83 



--96 



211 



86 



45 



Pig. 149. — Census showing conditions in the first and second generations in 

 1907 at Chapultepec test colony. 



7— J 



n——m 



21 



44 



46 



71 



(£m^-9 



<»— 5 



(§M^- — 7 



46 



83 



92 



77 



86 



43 



7 4 11 



Population 697, First Generation. 



^ m— 



15 "I 

 5 — 

 8— "HI 



1 



42 ~l^ 



6 .,^ 



7-- 

 14— 



5— 

 31 — 



p — 4 



17 



-m m" — ^2 

 ^ m «^ 



51 



(m — 4 

 ^ — ^ 



Population 370, Second Generation. 



Fig. 150. — Census showing conditions in first and second generations in 1908 

 at Chapultepec test colony. 



