INTELLIGENCE IN INSECTS 217 



WAGNER, M. Psychobiologische Untersuchungen an Hummeln. 



Zoologica, 46, '07. 

 WASMANN, E. Die psychiche Fahigkeiten der Ameisen. Zoologica, 



Heft. 26, '99. 



Comparative Studies in the Pyschology of Ants and of Higher 



Animals (Trans, from 2nd. ed.), St. Louis, '05. 

 WHEELER, W. M. Ants, N. Y., '10. 



