248 Mr. 0. Thomas on 



(s. u.) 25 ; ear 16. Of another specimen with perfect tail — 

 liead and body 132 ; tail 90 ; hind foot 25 ; ear 16. 



Skull: frreatest length 30-5, basilar length 23-7; greatest 

 breadth 16; nasals, length ll'S; interorbital breadth 5'9 ; 

 palate length 13; palatal foramina 5*6 x 2-2 ; length of upper 

 molar series 4'8. 



Hab. Zaruma, Southern Ecuador. Alt. 1000 metres. 



Type. Old female. B.M. no. 0. 2. 9. 44. Original num- 

 ber 380. Collected 14th June, 1899, by P. O. Simons. 

 Eight specimens. 



This animal varies considerably in colour, but the average 

 tone is far paler and more olivaceous than in true phceopus, 

 which is itself hardly as dark as the more nortliern subspecies 

 ohscurior, and the Central-American chrysomelas. It is the 

 most southern representative of the phceopus- chrysomelas 

 group, which is so distinct from true Oryzomys that I have 

 thought it worthy of subgeneric distinction *, and have sug- 

 gested for it the name of 3IeIanomys, with 0. phceopus as the 

 the type. 



Phyllotis holiviensis flavidior, subsp. n. 



Size and proportions about as in the typical, form, or the 

 tail may average slightly longer. General colour bufFy grey, 

 the hairs of the back broadly tipped with dark brown. Under 

 surface pale buffy white, the bases of the hairs slate. Yellow 

 patches at anterior base of ears strongly marked ; ears grey- 

 ish, but the hairs of the inner surface also generally yellowish. 

 Shoulders and forearms strongly washed with yellow, flanks 

 with a marked yellow edging to the white of the lower surface, 

 and rump suffused with yellow. Upper surface of hands 

 white, of feet also white, but with their outer edge and a 

 prominent patch on the end of the metatarsals deep yellowish. 

 Tail with its under surface dull yellowish, at least terminally, 

 often scarcely lighter than the upper surface. 



Dimensions of the type (measured in flesh) : — 



Head and body 126 millim. ; tail 95 ; hind foot (s. u.) 24 ; 

 ear 26. 



Skull: greatest length 30'5, basilar length 25"3 ; zygo- 

 matic breadth 16-8 ; nasals 12'2 x4-l ; interorbital breadth 4; 

 diastema 8*2 ; palatal foramina 7'2x3'l; length of upper 

 molar series 5*6. 



Hah. Bateas, Caylloma, Peru. Altitude 4500 m. 



Type. Female. B.M. no. 2. 7. 2. 5. Collected I9th May, 



* Novitates Zool. 1902. 



