Myotis thysanodes thysanodes [Miller] and [Allen], U. S. Nat. Mus. Bull., 144:126, May 25, 1928.
Type.—Obtained at Old Fort Tejon, Kern County, California, by T. S. Palmer on July 5, 1891; type in United States National Museum.
Measurements.—Two males and 3 females from Vernon, British Columbia, average, respectively: total length 90.5, 82; length of tail 41.5, 37; hind foot 10.5, 10; ear 18.5, 16; height of tragus 14, 13.
Distribution.—In Washington known only from the southeastern border of the state, namely from Dayton (W. S. M.) and Anatone ([Miller] and [Allen], 1928: 127).
Description.—Myotis thysanodes resembles Myotis evotis, but differs in larger size, smaller ear (reaching less than 5 mm. past nose when laid forward), and in possessing a well developed fringe of hairs along the border of the caudal membrane.
This species of bat ranges over western North America from southern British Columbia to southern Mexico. Two geographic races are currently recognized, only one of which occurs in the United States. This bat is not recorded by [Davis] (1939) as occurring in Idaho and has been found only once in Oregon. The only published account of the habits of thysanodes seems to be that of Palmer (in [Miller], 1897: 84, also [Grinnell], 1918) who found adults and young of various sizes in company with Myotis yumanensis in the attic of an old adobe building near Old Fort Tejon, California, in July, 1891. The specimens obtained in Washington and British Columbia came from dry areas of pine forest.
Myotis volans (H. [Allen])
Hairy-winged myotis
Description.—This species, in Washington, may be easily recognized by its relatively large size and the presence of a distinct keel on the side of the calcar, posterior to the foot.
Four subspecies of Myotis volans are recognized by [Miller] and [Allen] (1928: 136). These range over western North America from southern Alaska to southern Mexico. Two subspecies occur in Washington.