1886.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 413 



Upon marking the localities of D. phillipsi on a map of the United 

 States in Mercator's projection, I find that with one exception they lie 

 upon or south of a line running approximately northwest and southeast 

 between Fort Reading, California, and Fort McEae, New Mexico. 

 Specimen No. 1742 came from Pecos, New Mexico, near Santa F^, which 

 is considerably north of this line. On the other hand, all the five-toed 

 specimens came from localities lying upon or tiorth of this line, except 

 seven. 



Five of these are skins from the following localities : 

 San Francisco, California. ? Monterey, Cal. 



Posa Creek, Cal. Fort Tejon, Cal. 



San Diego, Cal. 



It will be perceived that all these specimens are from the coast of 

 Southern California and west of the coast range. The type of B. agilis 

 came from Los Angeles, which is also in this section. 



A sixth specimen, No. 2621, is from Coahuila, Mexico, and according 

 to Professor Baird, probably from near Santa Catarina, a village a few 

 miles west of Monterey, Mexico. This specimen is, therefore, from further 

 south than any other of the representatives of D. agilis except the next. 



This seventh specimen, No. 372, is labeled Durango, Mexico. If the 

 record is correct (and there seems to be no reason to doubt that it is) it 

 appears that the range of the species extends far into Mexico. 



From the material at command the boundaries of the ranged of the 

 two species are approximately as follows: 



D..phillipsi Gray. Fort Reading, California, on the west; Pecos River, 

 Texas, on the east; Fort Reading, Calfornia, and Pecos, N. Mex., on the 

 north ; and Reale del Monte, near Mexico City, Mexico (Gray), on the 

 south. 



J), agilis Gambel. San Francisco, Cal., on the west ; Fort Cobb, Arkan- 

 sas, on the east ; Fort Walla Walla, Wash. Ter., and Powder River, 

 Montana, on the north ; and Durango, Mexico, on the south. 



D. phillipsi extends farthest south and west, D. agilis farthest north 

 and east, but the ranges of the two species interdigitate extensively. 



