Two _Eptesicus_, kept in captivity for several weeks, exhibited very different personalities. One was shy and sullen. It cowered in the back of its cage and attempted to bite when handled. It would eat only small quantities of finely scraped liver tendered to it on a spoon. If a bit of liver adhered to its face it would shake violently and refuse to eat more. When it had eaten its fill, it would seize the spoon in its teeth and spill the remaining food. The second specimen was tame and greedy. It ate insects, liver, earthworms, and even pieces of flesh. After two days in captivity it learned to come to the door of its cage at a person's approach and open its mouth, in anticipation of food. If it dropped bits of liver on which it was chewing it would descend from the top of its cage to retrieve them, squeaking indignantly while doing so. It also descended to the floor of the cage to lap water from a dish. It habitually hung head downward from the roof of its cage, but reversed its position when evacuating urine or feces. Engler (1943: 96) discovered that big brown-bats will kill and eat smaller bats, at least in captivity. =Lasiurus cinereus cinereus= (Beauvois) Hoary bat _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. [Illustration: 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. The genus _Lasiurus_ is found in North America, South America, and the Hawaiian Islands. _Lasiurus cinereus_ ranges from British Columbia to southern South America. Osgood (1943: 53) records two subspecies from Chile.