While determining a collection of interesting Histeridae taken by the writer and others in Mexico during the past few years, three species were found to belong to the genus Pseudister Bickhardt. As two of these were undescribed, and as one species described from New York and one from Paraguay have been masquerading for many years under a different genus, the following short review is necessary to straighten out the existing confusion. Through the kindness of Dr. K. G. Blair and Dr H. Scott of the British Museum, types of all the species considered in this paper have been examined by the writer.