284 MERRIAM 



Remarks. — Externally peragrus resembles jalapce more closely 

 than it does 7nexicanus., but the skull is nearer mexicanus, being larger 

 and broader \.ha.n Jalapce^ with heavier zygomata and much more pro- 

 nounced superciliary ridges. The bullae and molars are decidedly 

 larger than in mexicanus. 



Measurements. — Type specimen (^ yg.-ad.): total length 294 

 mm. ; tail vertebrae 167; hind foot 35. 



ORYZOMYS RICHMONDI sp. nov. 



Type from Escondido River (50 miles above Bluefields), Nicar- 

 agua. No. ffrrf ^ ^^' U" ^' National Museum, Biological Survey 

 Coll. June 31, 1S92. Chas. W. Richmond. Original number 63. 



General characters. — Size rather large ; ears rather short ; pelage 

 rather coarse ; color grizzled fulvous. Animal closely related to 

 mex ica?ius ., but much darker. 



Color. — Upperparts grizzled yellow'ish fulvous, everywhere (but 

 especially on top of head) conspicuously lined and darkened by coarse 

 black hairs ; black hairs least abundant on rump which in some speci- 

 mens (as in the type) is intense fulvous or even rusty; underparts 

 ochraceous fulvous, chin and lips paler; tail dark, paler below but not 

 distinctly bicolor. 



Cranial characters. — Skull rather large and heavy with well marked 

 superciliary beads, moderately spreading zygomata, and rather long 

 and relatively slender rostrum. Compared with mexicanus, with 

 which the skull agrees in size, the rostrum averages decidedly longer 

 and more slender, with longer nasals (which usually end behind pre- 

 m axillae). 



Measurements. — Type specimen (^ ad.): total length 295; tail 

 vertebrae 150; hind foot 33.5. Average of 10 ^ 's from type locality : 

 total length 275 ; tail vertebras 137; hind foot 31.3. 



ORYZOMYS JALAPS Allen. 



Oryzomys jalapcB Allen, Bull. Am. Mus. Nat. Hist. New York, ix, 206-207, 

 June 16, 1897. 



Type from Jalapa, Vera Cruz, Mexico. 



Characters. — Size medium, about equalling mexicanus ; hind foot 

 smaller than in mexicanus; ears larger and darker; general color 

 grizzled buffy fulvous; skull rather slender. 



Color. — Upperparts buffy fulvous or ochraceous, conspicuously 

 lined with black hairs ; underparts strongly ochraceous except chin 

 and throat, which are whitish; ears and upper side of tail dusky, 

 underside of tail yellowish. 



