Citation: N. Gobbi et al., COMPARATIVE COLONY PRODUCTIVITY OF POLISTES-SIMILLIMUS AND POLISTES-VERSICOLOR (HYMENOPTERA, VESPIDAE) AND THE EVOLUTION OF PARAGYNY IN THEPOLISTINAE, Zoologische Jahrbucher. Abteilung fur allgemeine Zoologie und Physiologie der Tiere, 97(3), 1993, pp. 239-243