1958] 
Wilson — Chemical Releaser 
51 
Tinbergen, N. 
1952. Derived activities: their causation, biological significance, origin 
and emancipation during evolution. Quart. Rev. Biol., 27 : 1-32. 
Whelden, R. M. 
1957a. Notes on the anatomy of Rhytidoponera convexa Mayr {“ violacea” 
Forel) (Hymenoptera, Formicidae). Ann. Ent. Soc. Amer., 50: 
271-282, 3 pis. 
1957b. Notes on the anatomy of the Formicidae. I. Stigmatomma 
pallipes (Halderman). J. New York Ent. Soc., 65: 1-21, 2 pis. 
Wilson, E. 0. 
1959. Source and possible nature of the odor trail of fire ants. Science, 
129:643-644. 
