4 Warren — Notes on Distribution of some Colorado Mammals. 



Zapus princeps Allen. 



Two specimens of this jumping mouse were taken on Mt. Zirkel, Jack- 

 son County, July 11 and 12, 1911, at 9500 feet; one was taken at Brand's 

 ranch, near Lake John, 8200 feet, July 7, and one on the Gore Pass road, 

 about five miles east of Toponas, Routt County, 8300 feet, August 4, 1911. 

 This species seems to be widely distributed through the mountainous parts 

 of Colorado, though but comparatively few records of localities have been 

 published. 



Microtus pauper rimus (Cooper). 



A single specimen of this species was taken at Walden, North Park, 

 Jackson County, June 28, 1911. It was captured on an alkali flat west of 

 the town, the trap being set under a greasewood (Sarcobatus) bush. I 

 was unable to secure any more, though many traps were kept set in the 

 locality for several days. The Pigmy Vole has such a very interrupted 

 distribution in Colorado that each new locality should be recorded. 



Phenacomys orophilus Merriam. 



A specimen of this species was trapped by H. R. Durand near Buffalo 

 Pass at about 10,000 feet altitude, July 25, 1911. This makes the third 

 record for Colorado, the other two being one taken by myself at Lake 

 Moraine, El Paso County, and a specimen in the National Museum from 

 FairjJay, Park County.* The genus is certainly very rare in the State, for 

 altogether only five Colorado specimens are known of the two species 

 which occur here. 



Neotoma floridana baileyi Merriam. 



Merritt Caryf mentions finding woodrats' nests at Cedar Point, Elbert 

 County, a few miles northwest of Limon, and states that the animals are 

 probably this species. In a letter written a couple of years ago he spoke 

 of this to me, suggesting that I try and obtain specimens. I paid a visit 

 to the place May, 1911, finding several fresh nests, and collecting one 

 individual, which, as Gary surmised, proved to be Neotoma f. baileyi. 

 This is the most northwestern occurrence in Colorado of this species thus 

 far recorded. 



Reithrodontomys megalotis (Baird). 



A new Colorado record for the Big-eared Harvest Mouse is a specimen 

 sent me by C. H. Smith in November, 1910, and taken at Coventry, 

 Montrose County, altitude 0800 feet, some time that fall. The animal was 

 captured by Mr. Smith's cat, which should have due credit for taking a 

 species which had escaped the notice of Smith, Merritt Gary, and myself, 

 all of us having collected in that locality. The species must be rather 

 rare in that region, or it would have been taken before. 



* Cary, N. Am. Fauna No. 33, p. list. 1911. 

 + N. Am. Fauna No. 33, p. 115, 1911. 



