A series of _Oryzomys alfaroi_ in the U. S. Biological Surveys Collection obtained at Tumbala, 5000 ft., Chiapas, Mexico, the type locality of _Oryzomys alfaroi saturatior_, contains individuals some of which Goldman (N. Amer. Fauna, 43:66, September 23, 1918) referred to the subspecies _O. a. saturatior_ and one which he referred to _O. a. palatinus_. This latter specimen, to judge from the external measurements given by Goldman (_loc. cit._), is No. 76328. In comparison with the other material which Goldman saw, we find the specimen to agree with _O. a. palatinus_ in pale color and posterior concavity of the posterior border of the palate. In some other diagnostic cranial characters, it is indistinguishable from specimens of _O. a. saturatior_ from the same locality, and in other characters, notably the slenderness of the rostrum, it is intermediate between the two subspecies concerned. In short, although we see the reasons for Goldman's subspecific identification of this individual, we think, in view of the structural intermediacy of the animal and the characters of the series _en masse_, that it is best referred to _Oryzomys alfaroi saturatior_. ~Zapus princeps idahoensis~ Davis Preble (N. Amer. Fauna, 15:23, August 8, 1899) referred two specimens from Henry House and three from 15 miles south of Henry House, both localities in Alberta, Canada, to the subspecies _Zapus princeps princeps_. Subsequently, when _Z. p. kootenayensis_ (Anderson, Nat. Mus. Canada, Ann. Rept. 1931, p. 108, November 24, 1932) and _Z. p. idahoensis_ (Davis, Jour. Mamm., 15(3):221, August 10, 1934) were named, no mention was made of these specimens although the ranges assigned to _Z. p. kootenayensis_ and _Z. p. idahoensis_ seemed to isolate the Henry House area from the remainder of the range (as recorded) of _Z. p. princeps_. We have examined the pertinent specimens in the U. S. Biological Surveys Collection (75452 and 75453 from Henry House; 81509-81510 from 15 mi. S Henry House). On the basis of paler color, reduced lateral line, smaller skull, shorter palatal bridge and zygomatic arches, they are, among named subspecies, best referred to _Zapus princeps idahoensis_. _Transmitted July 30, 1952._