DATA OF DISTRIBUTION. 



The Species of this genus, like the rest of the Chrysomelidse of North 

 America, show a marked tendency toward the development of groups about 

 some central type. In Leptinotarsa this is carried to the extent that all 

 of the species fall into well-marked series not connected hy intermediate 

 conditions. Kach of these is traced with ease backward into the genus 

 Zygogramma, which is the ancestor of the genus Leptinotarsa. 



The species fall naturally into the following groups : 



Fi.AvopusTui.ATA Group. 



Leptinotarsa stali. 



evanescens. 

 dohrni. 

 belli, 

 flavopustulata, 



HaIvDKmani Group. 



lyeptinotarsa dahlbomi. 

 liogei. 

 haldemani. 

 hbatrix. 

 violescens. 

 chlorizans. 

 litigiosa. 

 tlascalana. 



IvAcerata Group. 



Leptinotarsa lacerata. 

 heydeni. 

 puncticollis. 

 modesta. 

 chalcospila. 



LiNKATA Group, 

 Leptinotarsa undecimHneata. 

 diversa. 

 angustovittata. 

 signaticolHs. 

 multitseniata. 

 oblongatB. 

 melanotborax. 

 rubicunda. 

 intermedia, 

 decemlineata. 

 defecta. 

 juncta. 



DiivECTA Group. 

 Leptinotarsa calceata. 



novemlineata. 



dilecta. 



flavitarsus. 



nitidicoUis. 



obliterata. 



Uneolata. 



pudica. 



typographica. 



distinguenda. 



RuBiGiNosA Group. 

 Leptinotarsa rubiginosa. 



Zetterstedti Group. 

 Leptinotarsa zetterstedti. 



The distribution of these groups over North America shows a strong 

 development in numbers and in species in southern Mexico. Only i reaches 

 the northern United States and Canada, 3 reach the southern United States, 

 and 6 northern Mexico, while 30 are found in southern Mexico only, 4 in 

 Guatemala, and 2 as far south as Costa Rica and Panama. 



