_Type._--Obtained on San Francisco Mountain, 8250 ft. elevation, Coconino County, Arizona, by C. H. Merriam and V. Bailey on August 4, 1889; type in United States National Museum. _Measurements._--Three males and 2 females from eastern Washington average: total length 77; length of tail 37; hind foot 7; ear 15; height of tragus 8. One weighed 5.4 grams. _Distribution._--Desert areas of eastern Washington, including the Columbian Plateau and the lower Columbia River Valley. Marginal records are: 5 mi. S Grand Coulee Dam (W. W. D.) in the north, Wenatchee (W. W. D.) in the northwest, Lyle (W. W. D.) in the southwest, and Bly (Miller and Allen, 1928: 171) in the southeast. _Description._--_Myotis subulatus_ is closely similar to _Myotis californicus_, but is more orange in color and has the skin on the face more nearly black. Specimens cannot be identified with certainty until the cleaned skulls are examined. The more flattened cranium and less abruptly rising forehead separate _Myotis subulatus_ from _M. californicus_. This species is confined to the United States and northern Mexico. Two races are recognized by Miller and Allen (1928), of which one occurs in Washington. It is the commonest bat in the desert of eastern Washington. It lives far from trees on plains and in sandy or rocky areas, emerging rather early in the evening. It is not difficult to shoot. Its flight is erratic. The animal usually hunts in large, irregular circles at 10 to 25 feet from the ground. It has not been found in its daytime retreat but may hide in crevices in rocky outcrops. Near Vantage, Grant County, individuals were shot as they hung up in a concrete underpass to digest food. The stomachs of specimens taken were so crammed with the remains of insects that their abdomens were greatly distended. The underpass seemed to be only a resting place, not inhabited by day. Others were taken when they came to rest in the loft of a barn at Selah, Yakima County. They usually did not arrive at the barn until an hour after sunset and were still present there at midnight. =Lasionycteris noctivagans= (Le Conte) Silver-haired bat _V[espertilio]. noctivagans_ Le Conte, McMurtrie's Cuvier, Anim. Kingd., 1:431, 1831. _Vesperugo noctivagans_ True, Proc. U. S. Nat. Mus., 7:602, 1885. _Lasionycteris noctivagans_ Allen, U. S. Nat. Mus. Bull., 43:105, March 14, 1894. _Type._--None designated; described from a specimen obtained in the "eastern United States." _Measurements._--Five males from San Juan County, Washington, average: total length 96.2; length of tail 46.4; hind foot 8.5; ear 16; height of tragus 7.2; weight 8.2 grams.