Wagner's Bonneted Bat

Eumops glaucinus is a medium-sized mastiff bat, but its size varies across its range. It is roughly 24–25 centimeters (9.4–9.8 in) long and between 30 and 47 grams (1.1 and 1.7 oz) in weight, with pregnant females sometimes heavier. The male is generally larger than the female. The species has a short, shiny pelage of bicolored hairs that are lighter at the bases, and the overall coat color can be black, brown, grayish, or cinnamon. The underparts are duller and paler. The bat has a long snout. It lacks a leaf-shaped nose appendage and protruding upper lip, but it has a keel above the eye. The ears are about 2 centimeters (0.8 in) in length and are wider than long. They are joined to form the "bonnet" shape. The wingspan is about 41–47 centimeters (16–19 in). The wings are narrow, as in other mastiff bats. The wings are adapted to long but rapid flights, especially in open areas. This bat has a musky odor. The male has a gular-thoracic gland of unknown function; it may be used to mark females or territory.

This bat is common in subtropical and tropical forest habitat, but it has often been recorded living in urban areas, including large cities. It appears to be attracted to the heat of metal roofs. It can also be found in deserts, swamps, and scrubland. It roosts in the canopies of trees and in cavities in the trunks, including abandoned woodpecker nests. It has been observed in royal palm (Roystonea regia), degame (Calycophyllum candidissimum), gumbo-limbo (Bursera simaruba), and Cuban palm (Copernicia gigas). It has been recorded at elevations up to 2,750 meters (9,020 ft). This species may live near other bats, such as the velvety free-tailed bat (Molossus molossus), the broad-eared bat (Nyctinomops laticaudatus), the little goblin bat (Mormopterus minutus), and Pallas's long-tongued bat (Glossophaga soricina).

The origin of E. glaucinus is found in the Blancan of the Pliocene roughly 3.3 million years ago.

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