yi> .L\'TS. 



a huge head and mandibles, often adapted to particular functions (right- 

 ing and guarding the nest, crushing seeds or hard parts of insects), 

 and a thoracic structure sometimes approaching that of the female in 

 size or in the development of its sclerites (Pheidolc). 



21. The dcsincnjatc is a form intermediate between the typical 

 worker and dinergate, such as we find in more or less isolated genera 



FIG. 59. Aplurnogastcr picea. an ant with monomorphic workers. (Photograph liy 



T. G. Hubbard and Dr. O. S. Strong.) 



of all the subfamilies except the Ponerinre, c. g., in Caniponotns ( Fig. 

 45, a), some species of Pheidolc (Fig. 52, b-c), Solcnopsis and Pogo- 

 nomyrinc.r, Aztcca, Dorylus (Fig. 62, &\ Eciton, etc. The term might 

 also be employed to designate the intermediate forms between the small 

 and large workers in such genera as Monoinoriitiii, Formica, etc. 



