new Neotropical Murida3. 349 



less extent the peculiar and characteristic coloration of a grey 

 or brown body, with red nose, rump, feet, and tail. See 

 below under Acodon Jelskii. 



Oryzomys Kalinowskii, sp. n. 



Size slightly greater than in its ally " Thomasomys" 

 cmereus. Fur very long and soft, the hairs of the back some 

 16 millim. in length. General colour finely grizzled brownish 

 grey all over, without special markings anywhere ; the hairs 

 of the back dark slate except at their tips, where there is a 

 narrow terminal or subterminal band of dull yellow. These 

 yellowish tips are broader and more prominent on the belly, 

 to which they impart a general dirty fulvous tone. Whiskers 

 long, numerous, whitish. Ears very large, laid forwards in 

 a spirit-specimen they reach in front of the anterior canthus 

 of the eye ; almost circular in outline, their anterior edge 

 without a basal prominence ; their surface well haired and 

 fringed, with long light-tipped hairs like those of the back 

 on the anterior half of their outer surfaces, and with shorter 

 brownish hairs on their posterior halves internally. Dark 

 colour of body running down on hands and feet to the end of 

 the metapodials mesially, while the sides and the whole of 

 the fingers and toes are silvery white. Palate-ridges 3 — 5. 

 Fifth hind toe reaching to the end of the first phalanx of the 

 fourth. Soles naked, pads very high and prominent. Tail 

 long, very like that of Mus rattus, nearly uniformly black, 

 not pencilled, but well and finely haired throughout, the under 

 surface slightly paler in colour than the upper. 



If the immature female mentioned below is the same 

 species as the type, of which I have little doubt, the mammas 

 may be recorded as 1 — 2 = 6. 



Skull thin and lightly built, smooth and rounded in its 

 general outlines, without cranial or supraorbital ridges. 

 Muzzle long and slender ; interorbital region rather narrow, 

 its edges just marked, not absolutely rounded, but quite 

 without beading. Palatal foramina a little longer than the 

 molar series. Pterygoid fossa? shallow, with a large circular 

 foramen in the middle of their posterior half. Lower jaw 

 elongate, of medium strength ; coronoid process rather light, 

 hooked backwards. 



Incisors smooth, rather narrow. Molars broad, heavy, and 

 rounded, with opposite cusps, as in true Oryzomys. 



Dimensions of the type (an adult male in spirit) : — 



Head and body 140 millim. ; tail 155 ; hind foot 32 - 8 ; 

 ear 22 x 17 ; forearm and hand 38 ; heel to front of last foot- 

 pad 15. 



Ann. & Mag. N. Hist. Ser. 6. Vol. xiv. 24 



