1907.] Wheeler, Fungus-growing Ants of North America. 799 



as a substratum for the cultivation of edible fungi. No wonder there- 

 fore, that, having emancipated themselves from the precarious diet of other 

 ants, which subsist on insects, the sweet exudations of plants and the excre- 

 ment of phytophthorous Rhynchota, the Attii have become the dominant 

 invertebrates of tropical America! 



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