Neochlamisus gibbosus (Fabricius) is a common leaf beetle in eastern and central North America (Karren, 1972). We provide detailed illustrated descriptions of each life stage based on field studies of a population on its host plant, Rubus laudatus Berger (Rosaceae), in Kansas, U.S.A. We found some previous diagnostic characters and some new ones can diagnose the species. We report two hymenopteran parasitoids, Conura sp. (Chalcididae) and Testrastichus sp. (Eulophidae), and one unidentified mite species on the juvenile defensive fecal case. Chemical analysis of the fecal case and host plant found little overlap in chemicals, suggesting that the beetles are manufacturing their own chemicals.