were lactating. These sex ratios vary significantly from an 

 expected 1:1 (Table 12). 



TABLE 12. — Sex and Chi-Square Values for Bats Captured at 

 Mystery Cave and Little Ice Cave. 



Species Males Females Total Chi-Sq 



Totals 161 22 183 



* Significant at P < .05 



Located on an arid ridge of Utah juniper-blacksage on BLM land, 

 Four-eared Bat Cave (T. 9 S., R. 28 E., Sec. 27, Carbon Co., MT; 

 elevation: 1537 m) is known to have been used by Plecotus 

 townsendii as a winter hibernaculum in the past. Aside from a 

 small amount of bat droppings, no bats were detected in this cave 

 in 1989. Four-eared Bat Cave is less extensive than either 

 Little Ice or Mystery Cave, with two large rooms extending inward 

 approximately 70 m, and the cave is dryer and warmer 

 (approximately 6° C at 25 m from the entrance) , possibly due to 

 its lower elevation relative to Mystery Cave and Little Ice Cave. 

 The opening of the cave is approximately 2 m high by 6 m long. 

 One 5.5 m and one 9 m net was set at this cave on 29 August. No 

 bats were captured or observed. 



Bats were not netted at the caves listed below, and several of 

 them were not visited. In those cases I rely on descriptions 

 from Cambell (1978) for discussion of bat roost potential. 



Royce Cave (9 S., R. 28 E. , Sec. 6, Carbon Co., MT; elevation: 

 1878 m) is located on BLM land in rock outcrop-forest, and was 

 investigated on 30 August. The cave is warm (approximately 6° C) , 

 but damper than Four-eared Bat Cave. Some bat droppings were 

 observed in this cave, but no other bat sign was noted. This 

 cave is moderately deep (approximately 75 m) with a large chamber 

 at the end of a 9 m crawl space. The cave may provide 

 appropriate roosting habitat for bats, and should be investigated 

 further. 



Salt Lick Cave (T. 8 S., R. 28 E., Sec. 17, Carbon Co., MT; 

 elevation: 2485 m) is located on BLM land in the Montana 

 grassland ecosystem. The cave is approximately 35 m deep and very 

 open, providing minimal shelter and thermal stability in winter. 

 The cave may be used as a summer roost, but no bat sign was 



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