We studied the richness and abundance of beetle families in two successional forest fragments located in close proximity on the campus of the University of Puerto Rico at Mayagüez (UPRM), western Puerto Rico. The study period extended from April to December 2005 and included nine monthly repetitions of quantitative samples using necrophilous, pitfall, and light traps. A total of 30 beetle families—48% of the families reported on the Island—and 38,126 individuals were obtained. The among-site variation was low, as both