<<i' J/ttrrtxf JAm.sv ront J/r.vVv*. 



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

 distinct. 



Cranial characters. Skull similar in general to that of psora, resem 

 bling it much more closely than that of ln-rnandczi. It differs from 

 psora, 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 inpwra. 



Measurement*. (Type specimen, 9* in flesh:) Total length 855; tail 

 vertebrae 295; hind foot 128. 



DESCRIPTION OF A NEW HARVEST MOUSE 

 (REITHRODONTOMYS) FROM MEXICO. 



BY 0. HART MERRIAM. 



Reithrodontomys chrysopsis sp. nov. 



Type from Mt. Popocatepetl, Mexico. No. 52,031 tf ad. U. S. Nat. 

 Mus., Biological Survey Coll. Collected Feb. 25, 1893 by E. W. Nelson 

 and E. A. Goldman. Grig. No. 4405. 



Characters. 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 arid rump by admixture of black hairs; 

 underparts whitish suffused with pale salmon fulvous; ears and ankles 

 dusky; fore and hind feet white; tail sharply bi color: above dusky, be 

 low white. 



Cranial characters. 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 bullas rather small; incisive foramina very long, cutting 

 plane of first molars, and of even breadth throughout. 



Measurements. Type specimen: Total length 194; tail vertebne 108; 

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

 length 185.5; tail vertebra 100; hind foot 20.5. 



