1914.] 



REITHEODONTOMYS KUFESCENS GROUP. 



59 



KEITHRODONTOMYS ALLENI sp. nov. 

 Allen Harvest Mouse. 



Tyfe from mountains near Ozolotepec, Oaxaca, Mexico (altitude 

 10,000 feet). No. 71563, U. S. Nat. Mus., Biological Survey Collection, 

 (? adult. Mar. 27, 1895; E. W. Nelson and E. A. Goldman. Original 

 number 7749. 



Distribution. — Known only from the type locality. 



Characters. — Externally similar to R. c. colimx but back darker, 

 underparts whiter, and tail longer; skull apparently nearest to that 

 of R. rufescens luteolus. 



Color. — Up perp arts mixed black and light pinkish cinnamon; darkest 

 along the median line; sides without a lateral Hne, less richly colored 

 than in colimse and much less so than in luteolus; underparts white; 

 ears pale fuscous; tail fuscous above, slightly paler beneath; front 

 feet buffy white; hind feet grayish white, washed with hair-brown; 

 ankles dusky. 



Slcull.^ — Apparently similar to that of luteolus, but smaller; bullae 

 similar; rostrum short and broad; nasals longer than premaxillse and 

 narrowed to a point at posterior end; zygomata standing out rather 

 squarely; molars without accessory enamel loops. 



Measurements.-— Tj^Q\ Total length, 182; tail vertebras, 100; hind 

 foot, 19. SkuU: (See table, p. 81). ^ 



Remarlcs. — This species, although living at a high altitude and 

 somewhat resembhng in color one of the members of the cTirysopsis 

 group, nevertheless seems to be most nearly related to R. rufescens 

 luteolus, which occupies the lower foothill country below the range of 

 aUeni. The skull of alleni resembles that of luteolus in having small 

 bullae and long nasals narrowed posteriorly. Externally alleni is 

 paler than luteolus and has white underparts. Additional material 

 may show it to be a subspecies of the latter. The species is named 

 for Dr. J. A. Allen, in recognition of his extensive work on the genus. 



Specimen examined. — One, the type. 



REITHRODONTOMYS COmi^ COLIM^ Merriam. 



CoLiMA Volcano Harvest Mouse. 

 (PI. II, fig. 5; PL V, fig. 5.) 

 Reiihrodontomys colimse Merriam, Proc. Wash. Acad. Sci., Ill, 1901, p. 551. 



Type locality. — Sierra Nevada de Colima, Jalisco, Mexico (altitude, 

 12,000 feet). 



Distribution. — Known only from the type locality. 



Characters. — Externally similar to R. c. chrysopsis, with long, woolly 

 pelage, but smaller and paler; skull similar to that of R. c. tolucse, but 

 smaller and with simple enamel pattern. 



1 Type and only specimen badly broken; shape of brainease not known. 



