THE 
AMERICAN NATURALIST 
VoL. XXXV. November, IQOI. No. 419. 
THE PARASITIC ORIGIN OF MACROÉRGATES 
AMONG ANTS. 
WILLIAM MORTON WHEELER. 
. THE genus Pheidole among ants is in several respects 
noteworthy. The unusually large number of species which 
it comprises afford valuable materials for the taxonomist, 
While their wide distribution and geographical variation can- 
in habits of the species of this extensive genus. And, 
finally, a fascinating congeries of morphological and physio- 
of the 
E = all the known species of Pheidole the worker phase 
is represented by two very different forms : small-bodied, 
EU big-headed, 
ag prions from the Zoilogical Laboratory of the University x bese 
877 
