58 ORYZOMYS. 



19.2; intertemporal width, 5.1; length of nasals, 11.3; palatal length, 

 7.1; length of upper molar series, 6.2; length of mandible, 19.3; 

 length of lower molar series, 6.5. Ex type in United States National 

 Museum. 



Genus Oryzomys (66). 



Oryzomys alfaroi incertus Allen. 



Oryzomys alfaroi incertus Allen, Bull. Am. Mus. Nat. Hist., XXIV, 

 1908, p. 655. 



Type locality. Rio Grande, Nicaragua. 



Genl. Char. Similar to O. alfaroi, but smaller and darker. 



Color. Head and entire upperparts golden rufous, darkest on 

 dorsal region; outer side of limbs paler; underparts and inner side 

 of limbs whitish; hands white, feet pale brown; tail naked, above 

 blackish, beneath paler; ears blackish brown. Ex type in American 

 Museum of Natural History. 



Measurements. Total length, 190; tail, 101; hind foot, 19.7. 

 Skull: Broken; intertemporal width, 4.7; length of nasals, 10.2; 

 length of upper molar series, 5.2; length of mandible, 13.4; length of 

 lower molar series, 4.6. Ex type in American Museum of Natural 

 History. 



Oryzomys bombycinus Goldman. 



Oryzomys bombycinus Goldman, Smith. Misc. Coll., LVI, 1912, 

 No. 36, p. 6. 



Type locality. Cerro Azul, near headwaters, of Chagres River,. 

 Panama. Altitude, 2500 feet. 



Genl. Char. Similar to 0. carrikeri, but fur longer, and the skull 

 more slender. 



Color. Face blackish; upperparts vandyke-brown ; dorsal line 

 black, flanks paler; underparts whitish; plumbeous color of under- 

 fur showing; hands and feet dark flesh color; tail above brownish, 

 beneath grayish. Ex type in United States National Museum. 



Measurements. Total length, 252; tail, 127; hind foot, 32. 

 Skull: Occipito-nasal length, 31.1; Hensel, 23.7; zygomatic width, 

 15.4; intertemporal width, 5.5; length of nasals, 12.2; palatal length, 

 6.2; 'length of upper molar series, 3.6; length of mandible, 14.1 ; length 

 of lower molar series, 5. Ex type in United States National Museum. 



Oryzomys pirrensis Goldman. 



Oryzomys pirrensis Goldman, Smith. Misc. Coll., LX, 1913, No. 22,. 

 P- 5- 



