FIG. 409. The Argentine ant (Iridomyrmex humilis Mayr.) 

 a, worker ; b, fertile queen. (After Newell) 



FIG. 410. Mound nest of western agricultural-ant (Pogonomyrmex occidentalis 

 Cress.), showing entrance hole in mound, and cleared space around it 



(After Headlee and Dean) 

 258 



