Vespertilio cinereus (misspelled linereus) Beauvois, Catal. Raisonné Mus. Peale, Philadelphia, 1796:18 (p. 15 of English edition by Peale and Beauvois).
Lasiurus cinereus H. [Allen], Smithsonian Misc. Coll., 7 (no. 165): 21, 1864.
Atalapha cinerea True, Proc. U. S. Nat. Mus., 7:602, 1885.
Type.—None designated. Type locality Pennsylvania, probably near Philadelphia.
Measurements.—Ten specimens from California average: Total length 130.5; length of tail 54.8; hind foot 10.7; ear 16; height of tragus 9.5; weight (of 3) 20.4 grams.
Distribution.—Recorded from Seattle (W.S.M.) to the north, Westport (W.S.M.) to the west and Pullman (W.S.M.) to the east.
Fig. 46. Record stations for the hoary bat, Lasiurus cinerea, in Washington.
Remarks.—The hoary bat is the largest and most distinctively marked kind of bat in the state. Adults are usually more than 5 inches in total length. The fur is exceptionally long and soft. The wing-membranes are thick and leathery. The posterior half of the wing-membrane is black; the anterior half is pale. The interfemoral membrane is furred. Dorsally the color of the fur is mottled white and seal-brown, giving a silvery-gray effect. The ears are short and thick; the feet short and wide. The dental formula is: i. 1-1/3-3, c. 1-1/1-1, p. 2-2/2-2, m. 3-3/3-3 = 32.