324 ADELE M. FIELDE. 







THREE SPECIES OF CAMPONOTINE ANTS WITH ONE SPECIES 



OF MYRMICINE ANTS. 



Group 12. Camponotus pennsylvanicus, Formica sanguine a 

 and Formica subsericea with Stenamma fulvum ; workers of each 

 species. 



ONE SPECIES OF PONERINE ANTS WITH ONE SPECIES OF 



MYRMICINE ANTS. 



Group ij. Stigmatomma pallipcs with Stenamma fulvum ; 

 queens of the former with workers of the latter. 



ONE SPECIES OF PONERINE ANTS WITH ONE SPECIES OF 



CAMPONOTINE ANTS. 



Group ij. Stigmatomma pallipes with Formica subsericea ; 

 workers of each. 



ONE SPECIES OF PONERINE ANTS, ONE SPECIES OF CAMPONOTINE 

 ANTS AND ONE SPECIES OF MYRMICINE ANTS. 



Group 75. Stigmatomma pallipes, queens and workers, with 

 workers of Formica subsericea and of Stenamma fulvum. 



In my artificial mixed nests, there is a close affiliation of ants 

 of different species. Those of different subfamilies sometimes 

 lick one another. Introduced young is carried about and taken 

 care of without regard to its origin. Ants of one genus accept 

 regurgitated food from those of another genus. 



Ants appear to associate readily with all harmless familiars. 

 In the wild nests of Stenamma fuhnim I often see gray sowbugs 

 roaming about, and they do not molest the ants, nor are they 

 molested by the ants. On my putting a sowbug into an artificial 

 nest of these ants, they seemed to treat it sportively, two or three 

 young ants sometimes mounting upon its back and riding there, 

 like children making excursions on an elephant. In my artificial 

 mixed nests, small ants often ride on large ones, or stand on 

 their backs and lick their heads. 



Natural mixed nests probably originate among ants that seek 

 in their abodes the same degree of moisture and of warmth. The 

 habitat of each species being determined by the food-supply, the 

 humidity and the temperature, any two species finding the same 



