1957] 
Weber — Cephalotes atratus 
69 
attacked freely. Later, apparently as a result of the syste- 
matic search and collecting, the ants became timid, drop- 
ping from the tree or running to the opposite side of the 
branch when approached. Finally the remainder formed 
on another tree into temporarily immobile small clusters. 
These remnants of an aggressive colony lacked the stimuli 
of the queen, brood and other workers that might be 
necessary to maintain their normal behavior. The colony 
was also noteworthy in containing large numbers of 
anomalies whose cause remains obscure. 
Literature Cited 
Kempf, W. W. 
1951. A taxonomic study on the ant tribe Cephalotini (Hymenoptera: 
Formicidae). Rev. de Ent., 22: 1-244. 
Weber, N. A. 
1938. The food of the giant toad, Bufo marinus (L.), in Trinidad and 
British Guiana with special reference to the ants. Ann. Ent. Soc. 
Amer. 31: 499-503. 
1947. Binary anterior ocelli in ants. Biol. Bull., 93: 112-113. 
Wheeler, W. M. 
1936. Binary anterior ocelli in ants. Biol. Bull., 70: 185-192. 
1937. Mosaics and other anomalies among ants. Harvard Univ. Press, 
Cambridge, 95 pp. 
Whiting, P. W. 
1938. Anomalies and caste determination in ants. Jour. Hered., 29: 
189-193. 
