126 PROCEEDINGS OF THE NATIONAL MUSEUM vol. ho 



species of bats. Vorhies (1935, p. 225) quoted Mexican informants as 

 saying "there were many bats in the drifts [side shafts of a mine] and 

 among them was the one spotted one." Hardy (1941, p. 293) observed 

 Myotis subulatus and Plecotiis townsendii in a Utah cave in which 

 Euderma had been reported. 



Apparently Euderma rests suspended by the feet with head down 

 (Parker, 1952, p. 480) ; an informant of Hardy (1941, p. 293) reported 

 hibernating individuals suspended by the thumbs, with head up. 

 Parker (1952, p. 480) recorded that a captive specimen walked with 

 wrists and feet, and could thus travel over horizontal surfaces with 

 considerable facility. Durrant (1935, p. 226) was told that a captive 

 moved about its cage in pursuit of flies held with forceps. 



When the bat is alert the normal carriage of the ear is erect, directed 

 slightly forward, with tip bent slightly back. When disturbed, the 

 bat folds ears, but not the tragus, down against the side of the neck, 

 much in the fashion of Plecotus townsendii (Parker, 1952, p. 480). 



Some individuals were docile, with little inclination to resist handling 

 (Parker, 1952, p. 481), but one was said to have "had plenty of fight" 

 when molested (Hall, 1939, p. 103). One was being attacked by one 

 or more "yellow jackets," and had sustained injury to the humeral 

 areas of both wings w^hen it was found. It was attempting to fend off 

 the insects v/ith its feet (Parker, 1952, p. 480). 



The voice of this bat has been described as a "soft, extremely high- 

 pitched, metallic squeak" (Parker, 1952, p. 481); a hissing noise and 

 rat-like squeak (Hall, 1939, p. 103); and a typical bat chirp (Durrant, 

 1935, p. 226). Also, it clicks its teeth together (Hall, 1939, p. 103) 

 and makes "a queer grinding noise by gnashing its teeth" (Ash craft, 

 1932, p. 162). 



The report of an individual that flew through an open door or win- 

 dow into a house at about 11 p.m. (Nicholson, 1950, p. 197) indicates 

 that Euderma, like Plecotus auritus, may be nocturnal rather than 

 crepuscular. 



Food : Although several captive individuals eagerly accepted water 

 to drink, few showed interest in various types of food. One ate cottage 

 cheese (Parker, 1952, p. 481). Another, force-fed at first, later readily 

 took flies offered with forceps. It accepted five flies at each of two 

 daily feeding periods. When flies were ofl'ered it wrinkled up its nose, 

 chirped, and advanced as rapidly as possible to seize the fly. It also 

 eagerly pursued empty forceps. This individual lived for three weeks 

 in captivity. Its death was accidental (Durrant, 1935, p. 226). Food 

 habits under natural conditions are not known. 



Data on migration, hibernation, reproduction, and molt are lacking 

 for this species. 



Local names: "Spotted" bat is the name in most general usage, 



