336 University of California Publications in Zoology [Vol. 10 



three stations were the highest at which the species was found 

 to occur, these being barely within the limits of Lower Transi- 

 tion. The species here as elsewhere seems to be essentially 

 Sonoran, and affects grassy places of not too moist a character. 



Examination discloses no obvious differences between speci- 

 mens from the San Gorgonio Pass base of the mountains and 

 the few from the Pacific side. There is some variation, and, as 

 in serias from elsewhere in southern California, certain examples 

 appear to be more reddish on the rump than any from the 

 San Francisco Hay region. The general tone of coloration, 

 however, is not decisively paler than in the northern animals; and 

 the San Jacinto scries, as far as il goes, is satisfactorily referable 

 to li. m. longicauda. 



Neotoma intermedia intermedia Rhoads 

 Dulzura White-footed Wood Rat 



Neotoma intermedia gilva Rhoads 

 Banning White-footed Wood Rat 



Neotoma intermedia desertorum ('. II. Merriam 

 Deserl Wood Rat 

 One hundred and two specimens of wood rats of the inter- 

 media-desertorum category are in our collections from the San 

 Jacinto region. In spite of the fact that the genus Neotoma has 

 been but recently monographed (Goldman. 1910), this portion 

 of our material has given us much trouble in its determination. 

 In Goldman's paper referred to, intermedia (with its subspecies 

 gilva) and desertorum are treated not only as distinct forms, but 

 as species belonging to two "groups" — and not nearly related 

 ones — of the subgenus Neotoma within which the author recog- 

 nizes six such subdivisions. This is a departure from the early 

 views of C. II. Merriam (1894, pp. 117-120), who recognizes 

 but four groups, in one of which, "the desertorum group," he 

 includes both intermedia and desertorum. The results of our 

 study prove to he most in accord with the latter view, and even 

 suggest strongly the propriety of considering desertorum as but 

 a subspecies of intermedia. 



