Rodents from Western South America. 295 



Eyes with marked yellowish rings round them. Ears well- 

 haired, without lighter spots behind them, dark rusty red. 

 Feet grizzled yellowish. Tail fairly long-haired, the hairs 

 ringed black and reddish basally, with black subterminal and 

 dull yellow terminal rings. 



Skull slightly larger than in S. Alfari ; nasals decidedly 

 shorter, their posterior edge directly transverse, some dis- 

 tance in front of the termination of the premaxillaiy processes. 

 Molars larger than in the allied species. 



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



Head and body 138 millim.; tail 112 ; hind foot, s. u. 35, 

 c. u. 38 ; ear 16. 



Skull : greatest length 38*8 ; basilar length 29 ; greatest 

 breadth 23'5 ; nasals 9*4 x 5 ; interorbital breadth 14 ; tip to 

 tip of postorbital processes 20 ; palate length from henselion 

 16 ; diastema (to front of p.*) 9 ; length of tooth-series (ex- 

 cluding the minute p. 3 ) 6'3. 



Hob. Porvenir, near Zaparal, Province of Bolivar, Ecuador. 

 Altitude 1500 m. 



Type. Female. B.M. no. 99. 9. 9. 12. Original number 

 261. Collected 16th March, 1899, by Mr. Perry O. Simons. 



Of the seven species and subspecies of the subgenus Micro- 

 sciurus represented in the British Museum, 8. Simonsi is 

 undoubtedly nearest to the Costa-Rican S. Alfari, Allen, but 

 differs by its rusty red ears, more prominent eye-rings, shorter 

 nasals, larger molars, and widely different locality. 



Sciurus (Microsciurus) peruanus napi, subsp. n. 



Quite like 8. peruanus of N.W. Peru in the general oliva- 

 ceous colour, absence of eye-rings, white patches on and 

 behind ears, and other characters, but distinguished by the 

 coloration of the belly, which, instead of being fairly defined 

 yellowish rufous, is only faintly and indistinctly suffused 

 with the same colour, the dark bases to the hairs giving the 

 general tone to the under surface. 



Skull as in true 8. peruanus, but the nasals apparently 

 rather shorter and more oval. 



Dimensions of the type (measured in skin) : — 



Head and body 157 millim. ; tail (broken at tip) ; hind 

 foot s. u. 34 ; ear 12. 



Skull: greatest breadth 21; nasals 9x5; interorbital 

 breadth 13; diastema 8; length of upper tooth-series (ex- 

 cluding/*. 3 ) 6. 



Hah. Mouth of Coca River, Upper Rio Napo. 



Type. Female, slightly immature. B.M. no. 0. 6. 3. 6. 



