2 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. DO 



Remarks. — Only a single specimen of this interesting new species 

 was collected. It was caught under a log in a mountain nut-pine 

 forest, in a region of heavy rainfall. The skull was broken by the 

 trap, but has been repaired so that the length and tooth-row measure- 

 ments are virtually accurate. The discovery of a species of Myopus 

 in the Altai goes far toward the fulfillment of MiddendorfFs 

 prophecy that these lemmings would be found eventually to range 

 across the continent ; and his excellent account of the specimen from 

 the coast of the Okhotsk Sea (Sibirische Reise, bd. 2, p. 108) seems, 

 in the light of this find, convincing. 



SICISTA NAPAEA, sp. nov. 



Type from Tapucha, Altai Mountains, Siberia. No. 175 195, 

 United States National Museum ; skin and skull ; adult J\ Collected 

 August 6, 1912, by N. Hollister. Orig. No. 4427. 



General characters. — A yellowish, unstriped species, nearest to 

 S. flava; but differing conspicuously in having the ears brown, not 

 black ; and with smaller hind foot and shorter tail. 



Color of type. — Above yellowish-buff, finely mixed with brownish ; 

 ears brown, with rufous spot above and below the base. Underparts 

 pure cream-buff, brighter on lower belly and anal region. Hands and 

 feet grayish-white, a rufous spot above heel. Tail distinctly bicolor; 

 brown above, gray below. 



Skull and teeth. — Skull about the size of that of 5". flava; but with 

 shorter rostrum and more inflated, rounded braincase ; zygomata 

 more spreading; audita! bulla; larger. Teeth essentially as in flava. 



Measurements of type, compared with an adult male of flava. the 

 latter in parentheses; Head and body, J$ mm. (76) ; tail vertebrae, 

 84 (118) ; hind foot, without claws, 16 (21). Skull of type : Condylo- 

 basal length, 18.5 ; occipitonasal length, 20 ; zygomatic breadth, 10.5 ; 

 upper tooth row, crowns, 3.0. 



Remarks. — The single specimen of this jumping mouse was caught 

 in a thicket in a very damp pinon forest at 6875 f ee t elevation. This 

 is doubtless the animal recorded by Kastschenko, from the Little 

 Altai, as Sminthits concolor Biichner. The species seems closel) 

 related only to flava. 



ALLACTAGA GRISESCENS, sp. nov. 



Type from Chuisaya Steppe (8 miles south of Kosh-Agatch), 

 Siberia. No. 175494, United States National Museum; skin and 

 skull; adult $. Collected July 28, 1912, by N. Hollister. Orig. No. 



4395- 



