INTRODUCTION 



Ten species of bats are known to inhabit the Pryor Mountain area 

 (Hall, 1981; Shryer and Flath 1980; Hoffmann and Pattie, 1968; 

 Table 1). Patterson (1985) captured a bat identified as Mvotis 

 calif ornicus in the Bighorn Canyon National Recreation Area (NRA) 

 in 1984. This specimen (University of Wyoming #5569) was recently 

 re-examined, and is referable to Myotis ciliolabrum (M.A. Bogan, 

 per. comm.). Two species, the spotted bat ( Euderma maculatum ) 

 and Townsend's big-eared bat (Plecotus townsendii ) . are listed 

 under category 2 as candidates for the Endangered Species Act 

 (Federal Register, 1987) . Plecotus townsendii and Euderma 

 maculatum are listed as sensitive species by the Forest Service 

 (USES) in Region 1. The pallid bat, Antrozous pallidus , together 

 with the previous two species, is listed as a species of special 

 concern by the Montana Natural Heritage Program (MTNHP, 1990) . 

 The first specimen of Antrozous pallidus from Montana was 

 collected by Shryer and Flath (1980) . Eight additional specimens 

 were observed in 1989 (Worthington and Ross, 1990) and 17 

 specimens were observed in 1990. Plecotus townsendii has been 

 found in hibernacula during winter in the study area (D. Center, 

 per. comm.), and 11 specimens were observed in 1990. Two 

 specimens of Euderma maculatum are known from the eastern edge of 

 the Pryor Mountains in the Bighorn Canyon NRA (T. Peters, per. 

 comm.), and the only live specimen was collected in Billings in 

 1949 (Nicholson, 1950; Hoffmann and Pattie 1968). Two specimens 

 of Euderma maculatum were captured in the Big Horn Canyon 

 National Recreation Area during the summer of 1990. 

 Additionally, several individuals were heard throughout the 

 eastern portion of the Pryor Mountains, particularly within the 

 Bighorn Canyon NRA. 



TABLE 1. — Bats Occurring in the Pryor Mountains, 



Mvotis lucifuqus 

 Myotis ciliolabrum 

 Myotis evotis 

 Mvotis volans 

 Eptesicus fuscus 

 Antrozous pallidus 

 Lasiurus cinereus 

 Lasionvcteris noctivaqans 

 Plecotus townsendii 

 Euderma maculatum 



little brown myotis 

 western small-footed myotis 

 long-eared myotis 

 long-legged myotis 

 big brown bat 

 pallid bat 

 hoary bat 

 silver-haired bat 

 Townsend's big-eared bat 

 spotted bat 



