Two new Murines from Ptru. 35.5 



broa'l, strap-like, short antcro-posterioriy. Palatal foramina 

 iarf^e and open. Biiihe small. Molars hroad and heavy. 



Dimensions of the type (measured in the fle.sli by col- 

 lector) : — 



Head and body 1 (»8 inillim. ; tail J80; hind foot 35; 

 ear 2'). 



Skull: greatest length 40; basilar length 32*2; greatest 

 breadth 22-3; nasals 15-6x5; interorbital breadth 4*2; 

 interparietal .•5-8x 11-2; palatal leni^tli from lienselion 174; 

 diastema 11-1 ; palatal foramina 9'2x3-2; length of upper 

 molar series 7"6. 



JIah. Eastern slope of Paramo between San Pablo and 

 Cajamarca, Peru. Alt. 4000 metres. 



Type. Female. B.M. no. 0. 3. 15. 3. Original number 719. 

 Collected by Mr. Perry O. Simons, 10th November, 1899. 

 One specimen only. 



This fine species is no doubt most nearly allied to the 

 Ecuadorean 0. anreus and the Bogotan 0. princeps, formino- 

 with these a small section of the genus, characterized by large 

 size, soft fur, obsolete supraorbital ridges, large open palatal 

 foramina, and a mountain habitat. As a species 0. pra>tor is 

 distinguished from the otlier two by many characters, of 

 which the most obvious arc its non-rufous colour and white 

 feet. 



At the same place as the type of 0. prcetor Mr. Simons 

 obtained two rats referable to the interesting " Thomasomijs " 

 cinereus, first discovered by Dr. Stolzmann at Cutorvo. 



Phyllotis amicus, sp. n. 



Intermediate both in size and colour between Ph. llaggardi 

 and the peculiar little desert species Ph. gerbillus, whose 

 reference to this group it satisfactorily confirms. 



Fur fine, soft and sleek ; the hairs on the back about 

 8-9 millim. in length. General colour above fawn-grey, 

 finely lined with black. Face and crown quite like baclc. 

 A line along cheeks, sides of neck, and flanks bright sandy 

 yellow, dividing the dorsal colour from that of the belly. 

 Under surface white, the bases of the hairs slaty. Ears very 

 large, finely haired, their outer surface greyish brown, their 

 inner fawn-grey. Upi)er surface of hands and feet pure 

 white. Tail long, well-haired, and slightly pencilled ter- 

 minally, brown above, white below. 



Skull in general form quite like those of the two species 

 above named, but its bulla?, in correlation with the external 

 ears, are unusually large, being larger than in the decidedly 

 bigger species Ph. Haggardi. 



23* 



