1913J Grinnell-Swarth: Birds and Mammals of San Jacinto 347 



just named, probably accounts for the greater conspicuousness 

 of the irregularities in intergradation. These peculiarities thus 

 involve less amounts of difference in characters in the rodents 

 named, so that "uniformity" in blending may be more appar- 

 ent in them than in the wood rats. The narrowness of the 

 area of intermediate climatic conditions appears to us also to 

 contribute to the causes of the lack of smoothness in the inter- 

 gradation of the wood rats. 



At any rate, systematically the proper thing is to employ the 

 trinomial with the wood rats as well as with the rest, and since 

 the name intermedia was first proposed in this group, it takes 

 precedence in specific combination, as presented in the heading 

 of this article. 



As to the proper name to use for the majority of the San 

 Jacinto specimens, namely, those of intermediate nature, diffi- 

 culty of determination is obvious. Feeling compelled to give 

 some name to every specimen, we prefer to lump most of the 

 intermediates under the name gilva, which was originally applied 

 to some sort of intermediate. Thus the Kenworthy specimens 

 alone merit the name intermedia, while the ones from Palm 

 Springs. Whitewater, and Dos Palmos may be with reason 

 included under the name desertorum, all other locality series 

 bearing the name gilva. 



Neotoma fuscipes mohavensis Elliot 

 Mohave Brown-footed Wood Rat 



An abundant inhabitant of the Upper Sonoran chaparral belt 

 chiefly on the Pacific drainage. Our collections contain fifty-one 

 specimens representing the following stations: Garnet Queen 

 Mine, 6000 feet, eleven specimens (nos. 2035-2037, 2048-2055) ; 

 Kenworthy, 4500 feet, ten (nos. 1851-1857, 1868-1870) ; Thomas 

 Mountain, 6800 feet, one (no. 2230) ; Strawberry Valley, 6000 

 feet, five (nos. 2122-2126); Schain's, 4900 feet, twenty (nos. 

 1698-1707, 1718, 1727) ; Cabezon, 1700 feet, four (nos. 1339, 

 1340, 1342, 1355). 



In Strawberry Valley and on Thomas Mountain, this wood 

 rat was fairly numerous, and was associated with some Transi- 

 tion zone elements as well as with other Upper Sonoran forms. 



