Mammal Species of the World
Click here for The American Society of Mammalogists species account
occurs (regularly, as a native taxon) in multiple nations
Regularity: Regularly occurring
Type of Residency: Year-round
Global Range: Southern Arizona south through western mainland of Mexico to Nicaragua. In the U.S., known from only 4 sites in vicinity of Baboquivari Mountains, Pima County, Arizona (apparently common there, but day roost site unknown). Specimen from near Sun City, Maricopa County, Arizona, sometimes referred to this species, is actually E. PEROTIS (Hoffmeister 1986). Winter distribution and precise limits of range are unknown.
Length: 17 cm
Weight: 61 grams
Size in North America
Range: 160-165 mm
Range: 40-65 g
Habitat and Ecology
Comments: In Mexico, found in arid lowlands. Roost sites in U.S. are not known. Most productive collecting site in Arizona is a pond in mesquite desert at 4,000 ft, 6 miles from the nearest low mountain range (Barbour and Davis 1969).
Non-Migrant: No. All populations of this species make significant seasonal migrations.
Locally Migrant: No. No populations of this species make local extended movements (generally less than 200 km) at particular times of the year (e.g., to breeding or wintering grounds, to hibernation sites).
Locally Migrant: No. No populations of this species make annual migrations of over 200 km.
Life History and Behavior
Apparently one young is born in late June or July.
Molecular Biology and Genetics
Statistics of barcoding coverage: Eumops underwoodi
Public Records: 0
Specimens with Barcodes: 1
Species With Barcodes: 1
IUCN Red List Assessment
Red List Category
Red List Criteria
National NatureServe Conservation Status
Rounded National Status Rank: N1 - Critically Imperiled
NatureServe Conservation Status
Rounded Global Status Rank: G4 - Apparently Secure
Underwood's bonneted bat
Underwood's bonneted bat (Eumops underwoodi) is a species of bat in the family Molossidae found in Belize, Costa Rica, El Salvador, Guatemala, Honduras, Mexico, Nicaragua and the southwestern United States.
Underwood's bonneted bat is sandy brown in color. It is a large bat with a wingspan of 20-22 inches, making it the second-largest bat found within the US, after the greater mastiff bat. Its long, narrow wings and the bones and muscles in its shoulder suggest this bat can fly very swiftly, and E. underwoodi possibly flies all through the night. Like many other species in the genus Eumops, it has a free-hanging tail that sticks far out of its tail membrane.
E. underwoodi is known to eat grasshoppers, leafhoppers, moths and beetles.
This species prefers to roost in tree hollows and under palm fronds, far off the ground. It favors dry roosting sites.
This bat's winter habits are poorly known. In northern parts of its range, it may migrate south for winter.
One pup is born in June or July.
- Miller, B., Reid, F., Arroyo-Cabrales, J., Cuarón, A.D. & de Grammont, P.C. (2008). "Eumops underwoodi". IUCN Red List of Threatened Species. Version 2009.2. International Union for Conservation of Nature. Retrieved 7 February 2010.
- "North American Mammals Eumops underwoodi" http://www.mnh.si.edu/mna/image_info.cfm?species_id=93
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Names and Taxonomy
Comments: See Eger (1977) for information on the systematics of the genus Eumops. Hall (1981) and Simmons (in Wilson and Reeder 2005) recognized two subspecies (underwoodi and sonoriensis).