8 BULLETIN 965, V. S. DEPARTMENT OF AGEICULTURE. 



wherever it has become estabhshed. Only on the margins of the 

 Argentine ant infestations does one find colonies of the native Pre- 





Fig. 4.— Characteristic traUs of the Argentine ant on a tree trunk. 



nolepis, Formica, and others. They have repeatedly been observed 

 to dislodge the large red agricultural ant (Pogonomyrmex califormcus 

 Buckley) from its nest, though sometimes this species persists for a 



