Species: Lasiurus cinereus
Encyclopedia of Puget Sound
Dorsum yellowish brown to mahogany brown, or mixed dark brownish and grayish, strongly frosted with white; venter whitish on belly, pale brown on chest, yellowish on throat; entire upper surface of interfemoral membrane is heavily furred; ears rimmed with black; length of head and body about 85 mm; adult total length 120-146 mm; forearm 46-55 mm; mass 25-35 g; greatest length of skull 17.0-18.7 mm; maxillary toothrow 5.3-6.5 mm; skull robust, rostrum broad and short, zygomatic arches widespread (Hall 1981, Shump and Shunp 1982, Ingles 1965).
Articles:
This article originally appeared in the State of Washington Bat Conservation Plan. Further information is available from the Washington Department of Fish and Wildlife.

The Washington Department of Fish and Wildlife recently released a Bat Conservation Plan for the 15 species of bats found in Washington State. All but four of these species occur within the greater Puget Sound watershed1, including:

Classification
Mammalia
Chiroptera
Vespertilionidae
Lasiurus
NatureServe
Classification
Ecology and Life History
Dorsum yellowish brown to mahogany brown, or mixed dark brownish and grayish, strongly frosted with white; venter whitish on belly, pale brown on chest, yellowish on throat; entire upper surface of interfemoral membrane is heavily furred; ears rimmed with black; length of head and body about 85 mm; adult total length 120-146 mm; forearm 46-55 mm; mass 25-35 g; greatest length of skull 17.0-18.7 mm; maxillary toothrow 5.3-6.5 mm; skull robust, rostrum broad and short, zygomatic arches widespread (Hall 1981, Shump and Shunp 1982, Ingles 1965).