Mammals from the District of Cuzco, Peru. 43 



tipto tip of interorbital processes 11 ; intertemporal breadth7'6; 

 palate length from gnathion 26 ; palate breadth 14"6 ; com- 

 bined length of ms. 1 ' 3 7*6. 



Hah. Vilcanota River, just north of Cuzco, alt. 1500 m. 



Type B.M. no. 98. 11. 1. 13. Collected by Otto Garlepp, 

 December 1897. 



lt Native name Rapp5sa." (The same word, but spelt 

 " Rapozo," is also given by Mr. Hopke for M. phcea.) 



This Marmosa is distinguishable from M. cinerea by the 

 non-extension of the body-fur on to the tail and by its deep 

 yellow cheeks and throat. In four young specimens sent 

 with the adult female, and no doubt her young, the orange 

 marking round the mouth is equally conspicuous. a Didelphys 

 noctivaga" Tschudi *, agrees with it in some particulars, but 

 the red sides described and figured in that animal readily 

 separate the two, and perhaps indicate that Tschudi's species 

 is a member of the rufous group allied to M. murina. 



Marmosa quichua, sp. n. 



Allied to M. marica, Thos., but rather larger, as large as 

 the smaller forms of the M. murina group. Tail white 

 terminally, as in M. cinerea. 



General colour above dull fawn, not very dissimilar to that 

 of M. marica, but rather darker and less wavy. Fur of back 

 about 8 millim. in length. Black orbital rings of medium 

 development. Lower cheeks, chin, and centre of chest buffy 

 yellowish. Belly buffy fawn, passing gradually into the 

 colour of the back, the hairs slaty at their bases. Upper- 

 sides of hands and feet whitish. Tail with its basal half inch 

 furry like the body, the remainder naked, black for its basal, 

 white for its distal half. 



Skull larger than in M. marica ; muzzle narrow ; zygomata 

 widely expanded, at least for their posterior halves, but ante- 

 riorly, for their orbital portions, their profile viewed from 

 above is concave, very much as in M. dryas. Nasals but 

 little expanded posteriorly. Supraorbital rims well defined, 

 beaded, evenly divergent, but not angularly expanded. Last 

 upper premolar slightly smaller than the middle one. Lower 

 canine about equal to the middle premolar, twice as high as 

 the subequal incisors and anterior premolars. 



Dimensions (approximate) of the typical skin : — 



Head and body 116 millim. ; tail 142 ; hind foot s. u. (wet) 

 17; ear (wet) 19. 



* ' Fauna Peruana,' Marum. p. 148, pi. viii. (1845). 



