Psyche 
[March 
1 66 
Richards, O. W. and M. J. Richards 
1951. Observations on the social wasps of South America (Hymenop- 
tera; Vespidae). Trans. Roy. Entomol. Soc. Lond., 102: 1-170. 
Thomson, E. Y., J. Bell, and K. Pearson 
1910. A second cooperative study of Vespa vulgaris . A comparison of 
the queens of a single nest with queens of a general population. 
Biometrika, 7: 48-63. 
1911. A third cooperative study of Vespa vulgaris. Comparison of 
queens of a single nest with queens of the general population. 
Biometrika, 8: 1-12. 
Wilson, E. O. 
1953. The origin and evolution of polymorphism in ants. Quart. Rev. 
Biol., 28(2) : 136-156. 
Wilson, E. O. 
1971. The insect societies. Belknap Press, Harvard University Press, 
Cambridge, Mass., x + 548 pp. 
Wright, A., A. Lee, and K. Pearson 
1907. A cooperative study of queens, drones and workers in Vespa 
vulgaris. Biometrika, 5 : 407-422. 
