248 ORYZOMYS. 



Color. Above rufous sparsely lined with black, brightest on the 

 rump; head suffused with grayish; under parts yellowish, hairs gray 

 at base; tail pale brown above, lighter beneath; hands and feet 

 whitish; ears blackish outside, yellowish inside. 



Measurements. Total length, 260; tail, 130; hind foot, 28; ear, 

 13. Skull: basal length, 26; basilar length, 24; greatest breadth, 17; 

 interorbital constriction, 5.2; breadth across squamosals, 12.9; length 

 of nasals, 12.6; palatal length, 14; length of upper molar series, 4.6. 



239. richmondi (Oryzomys), Merr., Proc. Wash. Acad. Scien., in, 



1901, p. 284. 

 ESCONDIDO RIVER RICE RAT. 



Type locality. Escondido River, 50 miles above Bluefields, Nica- 

 ragua. 



Genl. Char. Size large; ear short. Rostrum long, slender. 



Color. Above grizzled yellowish fulvous, lined with black; rump 

 sometimes rusty; under parts ochraceous fulvous, palest on chin and 

 lips; tail dark, palest beneath. 



Measurements. Total length, 295; tail vertebrae, 150; hind foot, 



33-5- 



240. fulvescens (//^5^rcw^),Sauss., Rev. Mag. Zool., 2me Ser., 1860, 



p. 102. 

 FULVOUS RICE RAT. 



Type locality. "Mexique." Orizaba, State of Vera Cruz? 



Geogr. Distr. Jalapa and vicinity, State of Vera Cruz, south to 

 Yucatan, Mexico, and Guatemala, Central America. 



Genl. Char. Tail longer than head and body; hind feet long, fur 

 slightly harsh. 



Color. Above yellowish fulvous, lined with black; flanks fulvous; 

 under parts yellowish rufous, except chin and throat, which are 

 whitish; tail naked, indistinctly bicolor, grayish above, paler beneath; 

 feet pale buff or whitish. 



Measurements. Total length, 173; tail, 100; hind foot, 20; ear, 14. 



A. Oligoryzomys. 



"Size very small; tail long; hind foot long and slender; fifth hind 

 toe moderately long. Skull small, delicate; interorbital region narrow; 

 outer edges of f rentals squarish, but unbeaded; braincase smooth 

 and unridged; zygomatic plate narrow and with but slight forward 

 projection; a decided longitudinal depression or trough in middle of 

 nasals; molar teeth small and delicate, but essentially like those of 

 true Oryzomys; incisor teeth very narrow and delicate." (Bangs.) 



