Rocky Mountains. 191 



tends to the nose; it is destitute of large verrucose promi- 

 nences intervening between the verrucse behind the eyes, 

 and of the large, irregular, black dorsal spots edged with 

 white, observable upon the musicus. In the arrangement of 

 the cinereous lines it presents a general resemblance to B. 

 fuscus. Laur. as represented on pi. 96. of the Encyc. 

 Method. 



It resides in a country almost destitute of timber, where, 

 with a variety of the musicus, it is very much exposed to 

 the direct rays of the sun. 



