This species feeds mainly on forest insects and for this reason is probably of considerable value to man. The stomachs of specimens were usually crammed with the remains of small, soft-bodied insects. =Corynorhinus rafinesquii= (Lesson) Long-eared bat _Description._--Diagnostic characters of the long-eared bat are: medium size (total length about 4 inches); dull, grayish-brown color; exceptionally long ears (over 1 inch from notch); thin, tissue-like membranes; and paired "lumps" on the rostrum. The dental formula is: i. 2-2/3-3, c. 1-1/1-1, p. 2-2/3-3, m. 3-3/3-3 = 36. [Illustration: FIG. 41. Long-eared bat (_Corynorhinus rafinesquii intermedius_), female with young; Boulder Cave, Kittitas County, Washington, July 20, 1928. (Fish and Wildlife Service photo by T. H. Scheffer, No. B-33332.)] Long-eared bats range from southern British Columbia to southern Mexico. Three species are listed by Miller (1924: 82), one of which (_rafinesquii_) is divisible into five geographic races. This bat is colonial and is not uncommonly found in caves, mine shafts, and darkened attics of old buildings. It is of scattered distribution throughout the state. In Washington its distribution in winter is unknown. A specimen from Friday Harbor, San Juan County, taken in March, 1936, indicates that it hibernates in the state. Whitlow and Hall (1933: 245) give a detailed account of individuals found hibernating in winter near Pocatello, Idaho. [Illustration: FIG. 42. Entrance to Boulder Cave, inhabited by long-eared bats (_Corynorhinus_); Kittitas County, Washington, May 26, 1938. (Fish and Wildlife Service photo by Victor B. Scheffer, No. 56.)] John K. Townsend (1839: 325) mentions that the "great-eared bat" at the forts of the Columbia River district (Fort Vancouver) were protected by the "gentlemen of the Hudson's Bay Company for their services in destroying the _dermestes_ which abound in their fur establishments." Townsend mentions also that the long-eared bats seldom left the "storehouses attached to the forts," even at night. My own observations are similar, in that at Boulder Cave, Kittitas County, on July 7, 1936, when not less than 100 long-eared bats were present in the cave, I watched the entrances to the cave until an hour after dark but no bats were seen to emerge. All of the specimens available from Washington were caught in their daytime hiding place. The number of long-eared bats at Boulder Cave has decreased in recent years. On July 12, 1930, bats were so abundant that 90 were captured with a single sweep of a butterfly net (T. H. Scheffer, 1930: 11). On July 7, 1936, it was estimated that there were slightly more than 100 in the cave. On June 11, 1937, the number was less, probably about 75. Little is known of the food habits of the long-eared bat. The stomach of a specimen from Blakeley Island, San Juan County, was crammed with the remains of insects, including the wing scales of _Lepidoptera_ and the wings of small Diptera.