Eumops chiribaya is considered a medium-sized member of its genus. The holotype had a forearmlength of and a weight of. An adult male specimen had a forearm length of and a weight of. It can be distinguished from other bats in Peru by its lack of a nose-leaf, tail extending beyond the edge of the uropatagium, large antitragus, reduced tragus, ears joined over the forehead, smooth upper lip, and ears longer than.