THE INTELLIGENCE OF ' 'THE LOWER ANIMALS" . 93 



PLATE IV 



Fig. 



EXPLANATION OF PLATE IV. 



Fig. I. Xenodusa cava Lee. (original). Fig. 2. Formica sanguined 

 subsp. rubicunda, Em. a female ; b pseudogyne ; c normal worker 

 (original) . Fig. 3. Thorax of a normal worker of F. rubicunda (original) . 

 Fig, 4 .--Thorax of a treudogyne of F rubicunda (original) . 



