Abstract
Water content of adult body was measured on several kinds of bean weevil attacking stored beans, namely Bruchus rufimanus, Callosobruchus chinensis (two geographical strains), C. maculatus (three strains), C. analis, C. phaseoli, C. rhodesiensis?. and Zabrotes bifasciatus. The change in water content of the body with the lapse of adult life and its sexual difference were different with the species, but these were almost the same within the geographic strains of a species. Among these species or the strains in each species, reciprocal relation was found between the body weight and the water content. Bruchus rufimanus which feeds on the succulent seed of growing plant in the larval stage was most heavy in its body weight and lowest percentage of water content, while the relation turned vice versa in Zabrotes bifasciatus whose larva feeds mainly on dryed seed under stored condition. Five species of genus Callosobruchus took their intermediate situation between these two extremes.
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