Mammals from DoUcia. 229 



number 1599. Collected 28tli Septomber, 1901. The second 

 specimen is younger and still in tlie plumbeous pelage. 



'I'iiis Tuco-Tuco may be readily distinguished from any 

 species known to me by the shape of its nasals, the marked 

 convexity of its parietal profile, and the peculiarly narrow 

 bullae. Externally it resembles C. Perrensi and tucuminus 

 in general colour, though it has no white on its under surface. 



None of Philippi's Atacama or Tarapaca species appear to 

 be related to it. C. per/tix, the only one of about the right 

 size, is said to have a white belly. 



Mr. Simons labels his specimens as cauglit " in ground in 

 moist sand," while the Potosi representatives of G. ophyius 

 were taken " in sandy place on ridge," " in decomposed 

 trachyte soil on ridge." Probably the two species do not 

 live on quite the same ground. 



14. Lagi'lium sp. 



(?. Potosi, 4400 m. 



This may represent Philippi's L. lutescens. 



15. Kerodon buliviensisj Waterh. 



cJ . Livichuco, 4500 m. 

 <J $ . iSucre, 2700 m. 

 ? . £1 Cabrado, 3500 m. 

 2 c?. Potosi, 4400 m. 



This species does not appear to occur in the pampas region 

 west of Lake Poopo, where it is replaced by K. niata. 



16. Kerodon niaia pallidioVj subsp. n. 



c? , 2 ? . Parapa Aullaga, 3700 m. 



? ? . Sevaruya, 3720 m. 



" The Cuis of Pampa Aullaga are quite different to any 

 others I have seen. Their hair does not fall out so easily, 

 and they make a faint short whistle when they dodge into 

 their holes."— P. 0. S. 



Similar to the typical Sahama form in every respect, but 

 paler throughout, the general tone a yellowish cream-colour, 

 the fore back, region round ears, and face being but little 

 darker than Ridgway's " cream-colour." Caudal region 

 bright yellow. 



Dimensions of the type : — 



Head and body 200 miilim. j hind foot, s. u. 38, c. u. 41 ; 

 ear '2'2. 



Skull : greatest length 4G-5 ; basilar length 35-5 ; zygo- 

 matic breadth 32 ; length of upper molar series (alveoli) 12. 



