Technical Abstract: Corn rootworms (Coleoptera: Diabrotica spp.) are serious pests of maize around the world. Larvae feed on corn roots, which reduces uptake of water and nutrients and lowers plant yield. Current control practices rely on soil insecticides or genetically modified corn varieties. Although some researchers have investigated natural enemies of adult rootworms, there is a lack of information on predators and parasites that attack soil-dwelling, immature corn rootworm stages. In 2006, we conducted a replicated field study to explore how corn variety impacted density of larval corn rootworms and potential subterranean predators, including ground beetle larvae and predatory mites. Corn varieties tested included two commercially available hybrids, and a corn rootworm resistant Bt variety and its susceptible isoline. Weekly soil cores were taken from June through July, and arthropods extracted using berlese funnels.