136 



CHAPTER II 



FIG. 3. Spread of the Colorado Beetle {Leptinotarsa decem- 

 lineata Say) in Europe until World War II, starting from 

 Senejac near Bordeaux about 1920. The present eastern 

 limit is tentative only. 

 (According to Alfaro, 1941, i943, and O. Ahlberg, in lift.) 



(Photo P. Ardo.) 



Alfalfa Weevil; fig. 6), the ground-beetle Carahus nemoralis Miill. (fig. 7)^ and many 

 others, which are supposed to be European introductions, in part just because of 

 their rapid expansion. Another ground-beetle, Pterostichus melanarius 111. {vulgaris 



^ The statement made by Evans (1952, p. 217-218), that Carabus nemoralis had been 

 purposely introduced into eastern Canada as a general predator, is due to a misinterpreta- 

 tion of Coscns (1923, p. 10). 



