The Department of Mammalogy of the American Museum of Natural History houses over 300 specimens of African colobus monkeys (genera Colobus and Procolobus). The collection consists of red, olive, and black-and-white colobus (Procolobus badius, P. verus, Colobus angolensis, C. guereza, C. polykomos, C. satanas, and C. vellerosus). Taxonomic notes, pelage descriptions, and range are noted for each species and subspecies. For each specimen, the following data are given: catalog number, date collected or recorded, sex, age, nature of specimen, locality, name of collector, and measurements.