“…The abbreviation NMNH refers to the museum building and is not used as as prefix for catalog numbers, whereas USNM no longer refers to the museum itself and is only used in reference to museum catalog numbers. This is the fifth type catalog of USNM mammals published to date, following Lyon and Osgood (1909; 1,415 specimens reported), Poole and Schantz (1942;2,824 specimens reported), Fisher and Ludwig (2012; 843 specimens reported for the order Rodentia, suborders Sciuromorpha and Castorimorpha), and Fisher and Ludwig (2014;945 specimens reported for the order Rodentia, suborders Myomorpha, Anomaluromorpha, and Hystricomorpha). We continue to deviate from the two earlier catalogs and follow the precedent set by the NMNH Division of Fishes (Vari and Howe, 1991) and Division of Amphibians and Reptiles (Reynolds et al, 2007), as continued by Ludwig (2012, 2014), in which the type collection is divided into smaller, more manageable taxonomic reports, rather than addressed in one monograph.…”