62 MELANOMYS. NEACOMYS. 



of Zygodontomys in the Check-List, 1905. p. 190, the second is described 

 below. 



N 



Melanomys idoneus (Goldman). 



Oryzomys idoneus Goldm., Smith. Misc. Coll. LVI, No. 36, p. 5. 



Melanomys idoneus Allen, Bull. Am. Mus. Nat. Hist., XXXII, 

 1913, P- 548. 



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

 Panama. Altitude, 2500 feet. 



Color. Above mixed cinnamon-rufous and black; flanks paler; 

 underparts tawny ochraceous; outer side of limbs dark brownish 

 cinnamon; hands, feet and tail black, hairs thinly dispersed over the 

 black skin. Ex type in United States National Museum. 



Measurements. Total length, 218; tail, 88; hind foot, 30. Skull: 

 Total length, 31.5; Occipito-nasal length, 30.9; zygomatic width, 

 17.5; intertemporal width, 6.5; length of nasals, 12.5; palatal length, 

 7.5; length of upper molar series, 4.8; length of mandible, 16.6; 

 length of lower molar series, 3.5. Ex type in United States National 

 Museum. 



Genus Neacomys. 



Neacomys Thomas, Ann. and Mag. Nat. Hist., yth ser., V, 1900, 



p. 153. Type Oryzomys spinosus Thomas. 

 Neacomys pictus Goldman. 



Neacomys pictus Goldm., Smith. Misc. Coll., LX, 1912, No. 2, p. 6. 



Type locality. Cana, eastern Panama. Altitude, 1800 'feet. 



Genl. Char. Similar to N. pusillus, but larger; feet white. 



Color. Feet and upperparts mixed orange-rufous and black, the 

 black being less strong on cheeks, shoulders and sides where the 

 ochraceous-buff predominates, and forms a line between the upper and 

 underparts; orbital rings and nose dusky; lips, throat, inner sides of 

 forearms and underparts white, the white going to the roots of hairs 

 on the throat; outer side of forearms ochraceous buffy, becoming 

 brownish near wrists; inner side of legs pale buffy; tail above dark 

 brown, paler beneath, but the tip is dark all around. Ex type in 

 United States National Museum. 



Measurements. Total length, 159; tail, 83; hind foot, 21.5. 

 Skull: Greatest length, 21.4; Hensel, 15; zygomatic width, 11.2; 

 intertemporal width, 4.4; length of nasals, 8.6; palatal length, 3.8; 

 length of upper molar series, 2.7; length of mandible, 8.6; length of 

 lower molar series, 2.8. Ex type in United States National Museum. 



