Four main phenotypes of Propylea japonica (Thunberg) occur in Wuhan, China: ancora, dionea,feliciae, and tessellata. The occurrence of these phenotypes in broad bean, wheat, and com was investigated. Body size, prey capacity, and starvation resistance were assessed for their relatedness to the different phenotypes. Individuals of ancora were dominant in the three crops and abundance of feliciae and tessellata was low. In various crops, the body length of feticiae adults was found to be larger than that of tessellata, and body width of ancora females was larger than that of tessellata females. Males of ancora consumed more Aphis craccivora Koch (about 45 per day) than males of feliciae. There were, however, no significant differences in starvation resistance among the four phenotypes. Our results demonstrated that the most abundant phenotype, ancora, had some advantages in terms of body width and voracity, while the less dominant phenotypes (feliciae and tessellata) were, respectively, less voracious and of smaller size. This indicates that body size and prey capacity may relate to the variable phenotype abundance occurring in crop environments.