Different initial densities of parent C maculates (F.), 4, 8, 16, 32 and 90 beetles, considerably affected insect development, respective performance, food consumption and weight losses of cowpea and faba bean seeds. Results cleared that developmental time of C. maculates (F.) reared in cowpea or faba bean seeds did not significantly differ with different population density of parent beetles. However, female fecundity significantly decreased by increasing beetle density, but mortality percentages of immatures as well as adult progeny were increased by increasing density of parent adults. Estimated of cowpea or faba bean seeds consumed and percentages of damaged and lost seeds were positively correlated with the increase of initial density of beetles. Results indicate that 75.5% and 47.3% damaged cowpea and faba bean seeds were obtained at a density of 4 L.etles, however, these values increased to 99.6% and 89.3% at a density of 40 beetles. Seed density (5, 10, 20, 90 and 80 seeds) of cowpea Or faba bean showed significant increase of female fecundity, total developmental time and number of newly emerged beetles as the seed density increased. However, mortality rate of immature reared in cowpea or faba bean seeds was negatively correlated with seed density. Seed consumption, damage and weight losses of infested seeds steadily increased by the increase of seed density to 90 seeds, after which considerable decrease in the former parameters was obtained by increasing seed density to the level 80 seeds.