1907.] 



Wheeler, Fungus-growing Ants of North America. 



805 



EXPLANATION OF THE PLATES. 



Plate XLIX. 



Fig. 1. — Cyphomyrmex rimosus Spinola var. comalensis var. nov. Worker. 



Fig. 2. — Cyphomyrmex wheeleri Forel. Worker. 



Fig. 3. — Atta (Trachymyrmex) turrifex Wheeler. Worker. 



Fig. 4. — Atta {Trachymyrmex) septentrionaUs McCook. Worker. 



Fig. 5. — Atta (MoeUerius) versicolor Pergande. Worker. 



Fig. 6. — Atta (Mycetosoritis) hartmanni s\^. nov. Worker. 



Fig. 7. — The same in profile. 



Fig. 8. — A. (M.) harttnanni sp. nov. Male. 



Fig. 9. — Atta (Trachymyrmex) arizonensis sp. nov. Deiilated female in profile. 



Fig. 10. — Head of same fi'om above. 



Fig. 11. — Atta texana Bucklej. Soldier. 



Fig. 12. — Thorax of same in profile. 



Fig. 13. — Atta texana. Media. 



Fig. 14. — Atta texana. Minima. 



Plate L. 



Atta {Mycocepurus) smithi Forel. Worker. 



Same in profile. 



Sericomyrmex opacus Mayr. Worker. 



Myrmicocrypta brittoni sp. nov. Worker. 



Same in profile. 



Apterostigma pilosum ]\Iayr. Worker. 



Atta se.rdens L. Brazil. Hypopygium of male. 



Atta cephalotes L. Panama. Hypopygimn of male. 



Atta insularis Guerin. Cuba. Hypopygium of male. 



Atta texana Buckley. Texas. Hypopygium of male. 



Atta mexicana F. Smith. Mexico. Hypopygium of male. 



Atta (MoeUerius) versicolor Pergande. Male. Genitalia from above. 



Unusual triple nest-entrance of Trachymyrmex turrifex. 



Unusual double nest-entrance of Mycetosoritis hartmanni. 



Bromatia of fungus (Tyridiomyces formicarum gen. et sp. nov.), 



eaten by Cyphomyrmex rimosus and its various subspecies and varie- 



Pl.\te LL 



Fig. 30. — Nest diagram of Mycetosoritis hartmanni (Nest X of the table on p. 

 763), showing four chambers, the connecting galleries, and the pendent fungus 

 gardens. 



Fig. 31. — Nest diagram of M. hartmanni (Nest T of the table on p. 763), with 

 three chambers all containing fungus gardens. 



Fig. 32. — Nest diagram of M. hartmanni (Nest V of the table on p. 763), with 

 three chambers. 



