 "P. p. psilotis" is distinguished by being smaller and paler than "P. p. personatus".Molecular phylogenetic studies have shown that Wagner's mustached bat does not have a common ancestor with the other members of its supposed subgenus, "Chilonycteris", and should instead be assigned its own subgenus; as yet, no formal change to the classification has been made.Wagner's Mustached Bat roosts in hot, humid, caves during the day, with colonies that commonly range from 100 to 10,000 individuals, although a few larger colonies are known.