PLATE 23. 



26 



29 



# 24 



27 i5^25 



22 







.'^'"^. w' 14 



R 





z'^^' 



I 





I.? 2 



V 



f 



ll'i 





'o illustrate orthogenesis in the color p;itterns of the elytra of the genus T.eptinotarsa. 



Heliolvt)'- CD..BOBtO'i 



