cave as a winter hibernaculum, and several specimens of this 

 species were captured here in 1990. Four-eared Bat Cave is less 

 extensive than either Little Ice Cave or Mystery Cave, with two 

 large rooms extending inward approximately 70 m from the 2 m by 6 

 m entrance (aspect 225°), and the cave is dryer and warmer 

 (approximately 8.8° C with 73% humidity). This cave was trapped 

 seven times between 22 June and 9 September, and 32 bats were 

 captured (Table 11) . 



TABLE 11. — Bats Captured at Four-eared Bat Cave, 

 Species Males Females Total 



Eptesicus fuscus 12 

 Myotis ciliolabrum 14 

 Plecotus townsendii 1 



3 

 2 



12 



17 



3 



Total 



27 



32 



Syke's Cave (T. 9 S., R. 28 E. , Sec. 22. Elevation: 1738 m) is 

 located approximately 3 km north of Four-eared Bat Cave on a 

 steep ridge in Utah juniper blacksage. The cave is similar in 

 structure to Royce Cave, consisting of a 30 m diameter chamber 

 leading to a 3 m X 2 m entrance (aspect 135°) via a 10 m tunnel, 

 This cave was dryer and warmer than the other caves with a 

 temperature of 13° C and a humidity of 57%. This cave was 

 trapped once on 6 August (Table 12) . 



TABLE 12. — Bats Captured at Syke's Cave 

 Species Males Females Total 



Myotis lucifuqus 

 Myotis ciliolabrum 

 Myotis evotis 



1 

 3 



1 



1 

 4 



1 



Total 



DISCUSSION AMD RECOMMENDATIONS FOR FURTHER WORK 



The capture of both a lactating female and a juvenile spotted bat 

 in mid-July suggests that this species probably breeds in the 

 area. Spotted bats were observed throughout the southern portion 

 of the Bighorn Canyon NRA, suggesting that they may be fairly 

 widespread in the southern portion of the NRA. 



17 



