ARBOREAL RICE RATS — HERSHKOVITZ 539 



rutilus Antllon5^ Judged by the original description, it is a subadult 

 of the same Kartabo series identified by Anthony as nitedulus. 



The description of paricola Thomas, from the state of Pard, Brazil, 

 Uke that of rosilla, was based on a comparison with western rather 

 than with eastern Ecuadorian representatives of bicolor. It is said 

 to be "duller" in color and smaller. Of two specimens at hand from 

 the Rio Tapajoz, Pard, one, an adult from Limontuba, is as small 

 cranially as the type; the other, from Igarap6 Bravo, is a subadult 

 with a much larger skull. The color of either, whether dull or bright, 

 is like that of bicolor from eastern Ecuador or anywhere else. 



Oecomys milleri J. A. Allen, from Barao de Malga9o, Mato Grosso, 

 Brazil, was aptly diagnosed in the original description as "similar in 

 general coloration and size to (E. bicolor (Tomes)." A careful exami- 

 nation of the type, two paratopotypes, a specimen from Urupa and 

 another from Urucum de Corumba confirms this characterization. 

 The Corumba specimen is bright ochraceous on upperparts, pure 

 white beneath. The topotypes are darker, with underparts yellowish 

 in one, pure white in the other. The Urupa individual is darkest, 

 tawny above, more buffy beneath. 



Specimens examined: One hundred and seventeen, from the 

 following localities: 



Colombia: Guaicaramo, Meta, 6 (AMNH); Mambita, eastern Cundinamarca, 

 1 (AMNH); Andalucia, Huila, 1 (AMNH); Florencia, Rfo Orteguaza, Caquetd, 

 5 (including type of florenciae, AMNH); Tres Troncos, Rfo Caquetd, Caquetd, 

 3 (CNHM); Rfo Mecaya, mouth of Rfo Caquetd, Putumayo, 3 (CNHM); Ino 

 Gaje, Rfo Apoporis, Vaupfo, 4 (CNHM). 



Ecuador: Below San Jos^, Rfo Payamino, Napo-Pastaza, 2 (AMNH); Rfo 

 Suno, Rio Napo, Napo-Pastaza, 3 (AMNH); Avila, Rfo Suno, Napo-Pastaza, 

 1 (USNM); Rio Jollfn, Napo-Pastaza, 2 (MCZ); Rfo Jatun Yacu, Napo-Pastaza, 

 1 (MCZ); Llunchi, Rfo Napo, Napo-Pastaza, 8 (UMMZ); Canelos, Rfo Bobo- 

 naza, Napo-Pastaza, 8 (AMNH, 5; MCZ, 3); Montalvo, Rfo Bobonaza, Napo- 

 Pastaza, 1 (CNHM); Rfo Copataza, Napo-Pastaza, 3 (CNHM, 2; AMNH, 1); 

 Zamora, Santiago-Zamora, 6 (AMNH). 



Peru: Rio Curaray, mouth at Rio Napo, Loreto, 11 (AMNH); Monte Alegre, 

 Loreto, 1 (AMNH); Sarayacu, Rio Ueayali, Loreto, 2 (AMNH); Yarinacocha, 

 Rio Ueayali, Loreto, 2 (CNHM); Pucallpa, Rio Ueayali, Loreto, 1 (CNHM); 

 Lagarto Alto, Rio Ueayali, Loreto, 4 (AMNH); Rfo Santiago, mouth of Rfo 

 Maraiion, 1 (AMNH); Puerto Indiana, Rio Maranon, Loreto, 1 (AMNH); Rio 

 Mazdn, Loreto, 1 (AMNH); Tambo Yacu, Rioja, San Martin, 1 (CNHM); 

 Chanchamayo, Junin, 1 (CNHM); Satipo, Junin, 3 (MCZ); Pozuzo, Huanuco, 

 1 (CNHM). 



British Guiana: Kartabo, Demerara, 12 (AMNH); Holmia, Potaro High- 

 lands, 1 (CNHM); Barakara, Canje River, 1 (AMNH); Essequibo River, 1 (BM, 

 type of nitedulus). 



Venezuela: La Uni6n, Bolivar, 1 (BM, type of rosilla); Rancho Grande, Ara- 

 gua, 1 (AMNH); Cano Seco, Cerro Duida, Amazonas, 1 (AMNH). 



Brazil: Jauarat6, Rio Uap^s, Amazonas, 2 (AMNH); Igarap6 Bravo, Rio 

 Tapaj6z, Pard, 1 (AMNH); Limontuba, Rio Tapaj6z. Pard, 1 (AMNH); between 



