"Vespadelus caurinus" superficially resembles the species "Vespadelus douglasorum", except for the larger size and tinges of yellow in the fur of that species; both species occur in the Kimberley region of the northwest.They may only be easily distinguished from "Vespadelus finlaysoni" by the locality, which do not overlap, or comparison of forearm length as less than 32 mm and usually smaller size overall; the second method of diagnosis is less certain as size ranges are variable in both species.