152 Merriam — NeAi': Harvest ^MoiiKt- from Jlr.ricc. 



the way around although the basal ones on the underside are very in- 

 distinct. 



Cranial clufrarters. — Skull similar in general tollial of pxura, resem- 

 bling it much more closely than that of JirriKduhzi. It differs from 

 2')xara, however, in having the jugal much narrower below the orbit, and 

 in having the lower premolars larger and more crowded. The fourth 

 lower premolar in particular is much more swollen than in pnora. 



MeasitremenU. — (Type specimen, 9- '« flesh:) Total length 855; tail 

 vertebrte 295; hind foot ]2cS. 



DESC^RIPTION OF A NEW HARVEST MOUSE 

 (KEITIIRODONTOMYS) FROM MEXICO. 



BY C. HART MERRIAM. 



Reithrodontomys chrysopsis sjj. nov. 



Type from Mt. Popocatapetl, Mexico. No. 52,031 rj" ad. U. S. Nat. 

 Mus., Biological Survey ('oil. Collected Feb. 25, 18!)3 by E. W. Nelson 

 and E. A. Goldman. Orig. No. 4405. 



Characti'Va. — Size small; ears large and moderately haired; tail very 

 long, slender and well haired; fur long and very soft; color golden-yel- 

 lowish. 



Color. — Upperparts from nose to tail rich bright golden-yellowish, 

 somewhat darkened on back and rump by admixture of black hairs; 

 underparts whitish suffused with pale salmon fulvous; ears and ankles- 

 dusky; fore aiul hind feet white; tail sharply bicolor: above dusky, be- 

 low white. 



Cratdid r/a/?v/r/rr.s-.-— Skull small and frail; braincase papery, in- 

 flated, subglobular posteriorly and everywhere well rounded; interorbital 

 region narrow, without trace of supraorbital beads; zygomata slender 

 but strongly notched by antorbital slits; rostrum small and very nar- 

 row; audital bulhe rather small; incisive foramina very long, cutting' 

 plane of first molars, and of even breadth throughout. 



Mea8uremenU. — Type specimen: Total length 1!)4: tail vertebrae 108; 

 hind foot 21. Average of two specimens from type locality: Total 

 length 185.5; tail vertebvie 100; hin-d foot 20.5, 



