MAMMALS OF THE REGION 129 



room shows where the earth and rock have caved in 

 and evidently filled an original opening. 



The cave bat is a medium-large, dull brown bat, with 

 short, pointed ears. 



CALIFORNIA BAT 



Myotis californicus pallidus 



One old skull of this little bat from the deepest room 

 in the cave was found among other bat bones of about 

 the same age. 



The little pale California bat is one of the very small 

 species. It has a spread of wings of about nine inches, 

 and is of a pale brown color, with dark brown 

 membranes. 



CANYON BAT 



Pipistrellus hesperus hesperus (Fig. 1+1) 



These pale bufTy bats, with strikingly black wings 

 and ears, are the midgets of our northern bats, adults 

 weighing four to five grams, and their wings spreading 

 only about eight or nine inches. They are the most 

 abundant bats in the canyons, where they swarm around 

 the springs and waterholes early in the evening, but 

 are so quick and crooked in flight as to be very difficult 

 to shoot. A considerable number were collected, but 

 at a large waste of ammunition. They seemed to 

 appear suddenly from cracks in the canyon walls, but 

 no special caves or gathering places could be found. 

 Some small bats, probably these, were seen flying about 

 in the mouth of the big cave, but no trace of them 

 could be found inside. 



