(Uploaded by Plazi for the Bat Literature Project) A morphological evaluation of different Myotis montivagus subspecies and M. annectans is presented. Using evidence provided by cranial and dental features and multivariate statistical analyses, we raise the four montivagus subspecies to species level, recognizing M. borneoensis, M. federatus, M. montivagus and M. peytoni as distinct species. Diagnoses, distribution and ecological data are given for each of these species and the morphologically very similar M. annectans. The conservation status of M. montivagus sensu lato should be reconsidered as our elevation of these subspecies to species results in a significantly smaller distribution range for each taxon.