as a night roost. On 8 October, internal temperature 1 1 m in was 13.5°C (56°F) at 1 1 :40, with 

 relative humidity = 44%. Outside ambient temperature and humidity were 3°C (37.5°F) and 

 77%, respectively, indicating that this cave traps warm air. 



Grouse Gulch Cave— This rock-shelter cave (T25N R25E S30SWSW), at 1280 m (4200 ft) 

 elevation, was visited on 8 October 1997. The cave has a large opening and ascends into the 

 hillside for 1 5.7 m (5 1 .5 ft). A few pictographs are present on the cave walls. Bats were not 

 seen, nor was any bat guano noted. However, the cave floor is covered with copious amounts of 

 pigeon and woodrat droppings, making detection of bat guano difficult. The cave traps wann air, 

 but no measurements were made at the time of the visit (12:30). This site, like Two Hands Cave, 

 is probably used as a night roost. 



"Smoke Hole" Cave— This rock-shelter cave (T25N R25E S16NWSWNW), just north of 

 Zortman at 1402 m (4600 ft) elevation, was visited on 17 September 1998. The cave has two 

 entrances. The main entrance is 2 m high by 6 m wide, a smaller opening is 1 .6 m high by 1 .9 m 

 wide and slightly downhill and north from the main opening. From the main opening, the cave 

 gently descends into a wide room to a stone wall 9 m from the entrance that was erected by 

 earlier visitors. From here, two crawlways continue, the left passage for about 8 m, the right 

 passage for about 7 m. Maximum cave length from the entrance is about 17 m (56 ft). At the 

 time of the visit (11:30), air temperature was 11.5°C (62°F) 9 m from the entrance, colder than 

 outside ambient (27°C, 80°F). From the secondary entrance, a short passage ascends to the main 

 room. Scattered bat guano was present throughout the main room, but no bats were seen. This 

 cave is probably used primarily as a night roost. 



Abandoned Mines — Several mine sites were visited briefly in 1996, none of which was 

 revisited in 1997-1998. The only visited mine mentioned in Hendricks and Center (1997) was 

 the Pink Eye Pearl Adit #1 (T25N R25E S7/T25N R24E SI 2), which was monitored overnight 

 on 9 July and showed significant activity by bats, including Eptesicus fuscus and Corynorhinus 

 townsendii. Of the workings visited, this was the most promising site for bats. The mine was not 

 entered, however. Other mine workings examined externally in 1996, but not entered, included 

 the Linda K (T25N R25E S7SWNW), at 1622 m (5320 ft). The adits were buried by gravel and 

 waste rock, and are not currently suitable for bats. The adits of the Ruby Mine (T25N R25E 

 S7SESW), at 1463 m (4800 ft), were also buried by gravel. Underground tunnels may intersect 

 the Ross Pit, and there may be significant underground workings. If reopened, this mine may 

 provide suitable bat habitat. The Badger King mine (near the Pink Eye Pearl, on Glory Hole 

 Creek) was comprised of 3 adits, all of which are blocked, although slight airflow was detected. 

 There was no evidence of bat use at the small entrance openings, but enlarging the entrances may 

 provide suitable bat habitat. A small collection of adits in Dry Gulch (T25N R24E S26NENE), at 

 about 1402 m (4600 ft), were examined. All were collapsed or mostly trenches, and unsuitable 

 for bats. 



SPECIES SUMMARIES 



Myotis californicus (California Myotis) — One male was reported captured at Azure Cave on 3 

 June 1996 (Hendricks and Genter 1997). The record is now considered questionable, based on 



