Rodents from Western South America. 297 



Hob. Eten, coast of N.W. Peru. Altitude 20 m. 

 Type. Male. B.M. no. 0. 3. 1. 62. Original number 589. 

 Collected 16th September, 1899, by Mr. P. 0. Simons. 



Phyllotis amicus (typical). 



Average measurements of five specimens from the type 

 locality, Tolon, altitude 100 m. : — 



Head and body 85*2 millim. ; tail 100 j hind foot 22*6 ; 

 ear 22*6. 



Colour rather darker than in either of the other subspecies. 



Phyllotis amicus montanus, subsp. n. 



Size comparatively large (average of four specimens : 

 head and body 90 millim. ; hind foot 24) ; tail long 

 (average 117*5) ; ears very large (average 24*75). 



Colour about as in the typical subspecies or slightly paler. 



Dimensions of the type (measured in the flesh) : — 



Head and body 93 millim.; tail 122; hind foot 24; 

 ear 26. 



Skull : basilar length 19'3. 



Bab. Uramarca, near Pallasca, N.W. Peru. Altitude 

 1200 m. 



Type. Female. B.M. no. 0. 6. 6. 28. Original number 

 760. Collected 7th December, 1899, by Mr. P. O. Simons. 



The four Tambo and Marca specimens of Ph. a. montanus 

 have the following average measurements : — 



Head and body 90 millim.; tail 111; hind foot 22*75; 

 ear 24*75. 



The two from Chosica, near Lima, which I refer to the 

 typical Ph. amicus'. — 



Head and body 85 millim.; tail 107"5 ; hind foot 23; 

 ear 22*5, 



Eligmodontia sorella, sp. n. 



A medium-tailed fawn-coloured species with long soft hair. 



Size rather less than in Mus musculus. Fur long, smooth 

 very soft and fine, the ordinary fur about 9 millim. long on 

 the back and 6-7 millim. on the belly, and profusely mixed 

 with longer hairs about 16 millim. in length. General 

 colour sandy fawn, darker and closely lined with black on 

 the back, clearer on the sides, where there is a well-defined 

 fawn-coloured line edging the white of the belly. Tips of 

 Ann, & Mag. N. Hist. Ser. 7. Vol. vi. 20 



