_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. The record stations in Washington for the pale, southern race are all in arid places and the dark, coastal race is a forest animal. Most of the specimens taken by me (all of the dark race) were in clearings or along roads through timber near the crests of hills. They appeared relatively late in the evening, after the big-brown and the silver-haired bats had been in the air for some time. Often they were taken in company with _Myotis lucifugus_ and _Myotis yumanensis_. They were appreciably larger than those species and their flight was slower and less erratic. They usually flew in relatively straight lines or large circles at from ten to forty feet from the ground. At Lake Kapowsin, Pierce County, they were attracted by swishing a long pole in the air. At Renton, King County, one was shot as it hunted insects at a city street light several hours after dark. =Myotis volans longicrus= (True) _Vespertilio longicrus_ True, Science, 8:588, 1886. _Vespertilio nitidus longicrus_ H. Allen, U. S. Nat. Mus. Bull., 43:103, March 14, 1894. _Myotis lucifugus longicrus_ Miller, N. Amer. Fauna, 13:64, October 16, 1897. _Myotis longicrus_ Lyon and Osgood, U. S. Nat. Mus. Bull., 62:271, January 28, 1909. _Myotis volans longicrus_ Miller and Allen, U. S. Nat. Mus. Bull., 144:140, May 25, 1928. _Type._--Obtained in the "vicinity of Puget Sound, Washington" by D. S. Jordan, and catalogued in the U. S. National Museum on December 16, 1886. _Racial character._--Color dark.