LITTLE BROWN BAT 



length, 3.6 inches; tail vertebrse, 1.7 inches; hind foot, 

 .36 inch; forearm, 1.6 inches; ear from notch, .8 inch. 

 Found in "Austral and Transition Zones from the Pacific 

 coast to the eastern edge of the Rocky Mountains; south 

 to Vera Cruz, Mexico." (Miller) 



Hollister Bat. — Myotis occuUus Hollister. 



Differs from other North American species of Myotis in low, 

 flat braincase and wide, flat rostrum. Upperparts rich 

 glossy brown with cinnamon tint; underparts paler, tinged 

 with buffy. Total length, 3.6 inches; tail vertebras, 1.6 

 inches; hind foot, .6 inch. Found along the west side of 

 the Colorado River from Needles, California to Yuma; 

 limits of range unknown. 



Fringed Bat. — Myotis thysanodes Miller. 



A large species with moderately long ears (which reach 

 about a quarter of an inch beyond tip of nose when laid 

 forward), wing attached to hind foot at a point between 

 ankle and base of toes, free border of interfemoral membrane 

 thickened and densely haired. Upperparts dull yellowish 

 brown; underparts paler; membranes dark. Total length, 

 3.5 inches; tail vertebras, 1.5 inches; hind foot, .32 inch; 

 forearm, 1.65 inches. Found in "Lower Sonoran Zone from 

 near the southern border of the United States to San Luis 

 Potosi and Michoacan, Mexico." (Miller) 



****** * 



Some species of this genus is usually the commonest small 

 Bat of any given region. The genus is almost cosmopolitan 

 in distribution, being found over a large part of both the 

 Eastern and Western Hemispheres, and some one of the many 

 American forms is generally to be seen at dusk anywhere 

 in North America where Bats can find flying insects. Myotis 

 can generally be told by its small size, the only other North 

 American Bat as small being Pipistrellus. These two genera, 

 however, can probably not be distinguished on the wing by 

 the layman. 



The flight of Myotis is fairly rapid, but because of the ample 

 membranes is more a series of full-winged flutterings than the 

 rapid beats of some of the more narrow-winged Bats such as 

 Tadarida. The flight is quite erratic and as a rule the Bat 

 flies at no great height above the ground. It is difficult to 

 observe when the light becomes dim because it seldom comes 

 against the sky-line unless directly overhead. 



The voice of this Bat is a very fine, wiry squeak, and 

 attention is often directed to the presence of Myotis by this 

 note which, however, is pitched so high as to be inaudible 

 to some individuals. 



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