Cenlronycteils a)id Ctenoniys y'rom S. America. 639 



Dimensions of the type : — 



Forearm 45 mm. 



Head and body 52 ; tail 18 ; third finger, metacarpus 46*5, 

 first phalanx 18'5 ; lower leg and hind foot 26. 



Skull : length 15 ; zygomatic breadth 10 ; palato-sinual 

 length 5 ; front of canine to back of m^ 6'1 ; breadth 

 between outer edges of m- 6 6. 



Hub. Bogava, Chiriqui, Panama. Alt, 250 m. 



Type. Adult male. B.M. no. 0.7.11.3. Original 

 number 31. Collected 20th October, 1898, by H. J. 

 Watson. 



Mainly distinguishable from C. maximiliani by its very 

 diilereut basisphenoid pits. 



Ctenomys saltarius, sp. n. 



Size fairly large, about as in Ct. opimus. Fur rather 

 short (about 13 mm. in length on the back) and dull in 

 tone, having neither the length nor glossiness of that of tlie 

 neighbouring species. Colour dull ''raw umber ^' above, 

 browner along tiie median dorsal area, paler on sides. 

 Under surface dull butfy whitish. Area round snout 

 Avhitish, succeeded by an inconspicuous darker collar. Feet 

 dull white. Tail more markedly bicolor than usual, blackish 

 above, dull white below. 



Skull very narrow, the zygomatic spread less than the 

 distance from the front of the incisors to the back of the 

 tooth-row, markedly greater in other species. Frontal 

 region also very narrow, the interorbjtal breadth less thau 

 the length of the molar series. Postorbital processes 

 practically absent. 



Dimensions of the type (measured in skin) ;— 



Head and body (stretched) 200 mm. ; tail 90 ; hind 

 foot 33. Skull : front of nasals to back of frontals 34'8 ; 

 front of incisors to back of in 295 ; zygomatic breadth 28'5 ; 

 nasals 20 x 7'7 ; interorbital breadtii 9"2 ; palatilar length 

 23*8 ; diastema 15 ; upper tooth-series, crowns 10*5, 

 alveoli 11. 



Hub. Salta, N. Argentina. 



Tijpe. Adult female. B.M. no. 99.2.22.26, Original 

 number 8904. Presented by the La Plata Museum through 

 Dr. F. P. Moreno. 



The only species occurring near this are the far paler 

 Ct. opinms (of which a special subspecies, Ct. o. luteolus, is a 

 native of Jujuy) and the dark brown Ch. tacumanus of 



