June, 1903. A List of Mammals — Elliot. 213 



San Pedro Martir Mountains. The present series demonstrates 

 completely that this is far from being a fact, and that the species is 

 not only met with on both the east and west coasts — San Felipe and 

 Ensenada to San Quentin, from which localities examples were pro- 

 cured — but that its range extends also into southern California at 

 least north to the Colorado Desert, and the reason it was not recog- 

 nized on the coast and in southern California was that the speci- 

 mens from these localities had been described under another name, 

 P. t. medius, Mearns. 



That this form is identical with P. thurberi is established by these 

 Lower California examples. I have received for comparison with my 

 large series of thurberi, through the kindness of G. S. Miller, Jr., Ass. 

 Curator of Mammals, U. S. Nat. Museum, eighteen specimens of so- 

 called P. t. medius from Rosa Canon, San Diego Co., California, be- 

 longing to the collection of the National Museum, and six of the same 

 from the New York Museum (2 from Sanos Cedros, Calif., 2 from 

 Jacumba, Calif., and two from the Nashaguerro Valley, Lower Califor- 

 nia), the latter being topotypes of medius. In this (Field) Museum we 

 have eleven specimens of medius, 2 from San Juan, Calif., 1 from Cuya- 

 maco, Calif., 1 from Jamul, Calif., and 7 from San Antonio, Califor- 

 nia; 35 specimens in all of so-called medius ; not a large series, but 

 sufficient to demonstrate the value of its claims to a distinctive 

 rank, if it possessed any. After a very careful examination of these 

 and my series of 77 specimens of thurberi, (for in addition to those 

 in Mr. Heller's collection there are five others in the museum, two 

 of which are topotypes collected by Thurber), I do not find a single 

 character either in color of pelage or in the skull to separate medius 

 from thurberi. Dr. Mearns says that medius is a coast form, west of 

 the coast range. There are before me 14 examples from Ensenada 

 on the coast which are identically the same as thurberi from locali- 

 ties in the high mountains, and these resemble precisely topotypes 

 of medius from the Nashaguerro Valley. Also topotypes of thurberi 

 from the San Pedro Martir Mountains agree in every way with speci- 

 mens of medius from southern California. The mountain speci- 

 mens, those from the coast and also those from the plains in both 

 the paler or darker pelage, can equally be matched one with the 

 other irrespective of locality, and it is a hopeless task to find any- 

 thing by which they can be separated. As the name thurberi has 

 years priority over medius, it will be the one by which this species 

 will be known, and it has a wide range from southern California 

 as far north certainly as the Colorado Desert, south into Lower Cali- 

 fornia, possibly to San Quentin on the coast and perhaps farther, 



