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17’. Ear when laid forward extending less than 6 milli- 
meters beyond nostril. 
18. Free border of uropatagium distinctly fringed with 
fine hairs. Myotis thysanodes 
18’. Free border of uropatagium faintly or not at all 
fringed. 
19. Length of tibia 15 to 19 millimeters. 
20. Length of tibia less than 17 millimeters. 
Color of back, drab; habitat Lower Sonoran 
zone east of the desert divides. 
Myotis velifer * 
Color of back, light brown; habitat Boreal 
zone on mountains of east-central and north- 
ern California. Myotis lucifugus altipetens 
Color of back, dark brown; habitat extreme 
northern coast belt. 
Myotis lucifugus alascensis 
20’. Length of tibia more than 17 millimeters. 
Color of back, yellowish brown; habitat south- 
ern Sierra Nevada and mountains of south- 
ern California. Myotis longicrus interior * 
Color of back, dark brown; habitat central and 
northern Sierra Nevada and humid coast 
belt. Myotis longicrus longicrus * 
19’. Length of tibia less than 15 millimeters. 
21. Foot 5 to 6 millimeters in length. 
Color of back, pale grayish brown; habitat 
Lower Sonoran zone east of the desert di- 
vides. Myotis californicus pallidus 
Color of back, bright brown; habitat Upper 
Sonoran and Transition zones south of the 
36th parallel. Myotis californicus quercinus :‘ 
Color of back, dark brown; habitat Upper 
Sonoran and Transition zones north of the 
36th parallel. Myotis californicus californicus * 
21’. Foot 7 to 10 millimeters in length. 
22. Height of tragus more than 6.5 millimeters. 
Myotis orinomus 
22’, Height of tragus less than 6.5 millimeters. 
Color of back, cinnamon brown; habitat val- 
ley of the Colorado River. 
Myotis occultus 
Color of back, light buff; habitat Lower 
Sonoran zone east of the desert divides. 
Myotis yumanensis yumanensis 
Color of back, buffy brown; habitat Sonoran 
and Transition zones west of the desert 
divides. Myotis yumanensis sociabilis : 
Color of back, dark brown; habitat extreme 
northern coast belt. 
Myotis yumanensis saturatus * 
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