RICE RATS 287 



Rctnarks. — Oryzomys bulleri is most nearly related to Jalapce, 

 but externally it resembles mexicanus most closely. In fact, judged 

 from the skin alone, it is merely a small edition of mexicamis — slightly 

 paler above, white bellied, and with very much smaller feet. But its 

 light and delicate skull requires no comparison with the larger and 

 more massive skull of mexicantis. 



Measjiremejtts. — Average of 6 specimens from Armeria, Colima: 

 total length 251 mm. ; tail vertebras 134: hind foot 31. 



ORYZOMYS RUFUS sp. nov. 



Type from Santiago, Tepic, Mexico. No. 91404 9 old. U. S. 

 National Museum, Biological Survey Coll. June 20, 1S97. E. W. 

 Nelson and E. A. Goldman. Original number 11 232. 



Characters. — Similar in general to bulleri but smaller and redder ; 

 pelage softer; skull very short; ears rather small. 



Color. — Upperparts deep dull fulvous, the fulvous reaching forward 

 to head and not obscured on back by black hairs (the black hairs small 

 and scattering) ; underparts soiled white, the plumbous underfur show- 

 ing through except on chin and in inguinal region ; tail dusky, paler 

 below. 



Cranial characters. — Skull short and heavy ; superciliary bead 

 only slightly developed; incisive foramina remarkably long; rostrum 

 small and short. Compared With, bulleri the skull is decidedly shorter 

 and more massive; superciliary ridges slightly more pronounced; 

 rostrum much smaller and shorter ; zygomata more spreading and 

 more strongly elbowed anterioi^ly ; palatine slits very much longer 

 and larger ; teeth smaller. 



Measurements. — Type specimen ( 9 old) : total length 250 mm. ; 

 tail 136; hind foot 28. 



ORYZOMYS COUESI (Alston). 



Hesperomys couesi Alston, Proc. Zool. Soc. London, p. 756, 1876. 

 Oryzotnys couesi Thomas, Ann. and Mag. Nat. Hist. (6), Vol. XL, p. 403, 

 May, 1893. 



Type locality. — Coban, Guatemala. 



Characters. — Size and ears medium ; pelage harsh ; fulvous brown ; 

 skull light and thin (apparently intermediate between the Jalapce and 

 chapmajii groups) ; molar series very long. 



Color. — Upperparts varying from buffy fulvous to deep fulvous, 

 conspicuously grizzled with black hairs ; underparts varying from 

 yellowish fulvous to salmon fulvous; ears and upper side of tail 

 dusky; tail below whitish ; hind feet whitish. 



