s, Spermophilus lateralis, Clethrionomys gapperi, Phenacomys intermedius, Microtus longicaudus, Microtus montanus, and Zapus princeps. Thomomys talpoides may be considered in this category also, although it is less restricted in range and habitat than most of the other species listed as boreal. These thirteen species make up almost half of the twenty-seven species known from the Grand Mesa.
WIDE-SPREAD.--Species in this category are those that are widely distributed in the western United States and that occur in Colorado in both the mountains and the lower more arid intermontane areas. Some of these species are differentiated into subspecies, one of which inhabits the mountains and another the lowlands. Wide-spread species that do not have subspecies in the lowlands different than the subspecies in the mountains or that are represented by too little material from the Grand Mesa to be evaluated critically are Myotis evotis,