716 THE AMERICAN NATURALIST. [VoL. XXXV. 
I found about a dozen of the ants, which were readily recog- 
nized as Tomognathus. There may have been a few Lepto- 
thorax in the material, — certainly very few, if any, — but when 
Fic. 17. — 71 th canus Emery. Worker. 
collecting with the sieve it is hazardous to affirm that any 
ants that are found belong to mixed or to independent 
colonies.” 
VI. CoracoBiosis. 
It is very difficult to establish a clear distinction between the 
ants of this and the preceding category, since Strongylognathus 
is obviously transitional. Forel even includes this genus among 
the social parasites, while Wasmann includes the whole of 
Forel’s category among the forms which I have designated as 
dulotic. I believe, however, that I am justified in erecting * 
special category for Anergates, which is the only well-known 
