from ^^Olro Cerro," North-eastern li'ioja. 499 



Jenfrtli 50-5, 43 ; zygomatic breadth 30*2, 27 ; nasals 17-5, 

 14-7x8, (V6 ; iiittMoibital hiea<ltli 12, 98; lea.st bieadtli 

 across biuin-case lUS, IT'S ; bi-mcat:il breadth 31 '3, 27 ; 

 palatihir length 23-7, 20 ; l.-ngth of bullaj 17, 15-2 ; upper 

 tootli-seiies (alveoli) ll'l, U', (ciowns) 10, \^'(y. , 



Ti/pe. Adult male. B.M. no. 19. 2. 7. 47. Original 

 niiniber 33«. Collected 27th August, 1018. 



This tuco-tuco is no douht nearly allied to C. hiuUnif but 

 ma}' be distinguished externally by its dark nuiz/de, more 

 buffy sides, and absence of collar, and in tlio skull by the 

 various details above described, and notably by the absence 

 of a separate interparietal. 



It is named in honour of Col. C. Morley Knight, by whom, 

 in conjunction with his partner Col. J. J. Porteous, the 

 explorations of Messrs. Kemp and Budin have been so much 

 facilitated in various wavs. 



" Found on stony ground." — E. B. 



13. Lajidium lockicoodi, sp. n. 



? . 333. 



Size comparatively large, about as in L. cuscus. 



General colour nearest to that of L. cuscus, of a similar 

 deep grey colour, but not quite so dark; darker than in 

 L. tucumanum. Dorsal dark line well delined, distinct, 

 running fiom nape to rump. Umler surface broadly washed 

 with butly ocliraceous ; no axillary wliite patches present. 

 Feet grizzled grey, scarcely lighter terminally. Tail tlistinctly 

 black along its under surface, its long crest mixed black 

 and dull butfy whitish, the end black. 



Skull decidedly larger than in L. tucumamnn, the only 

 species geographically near; muzzle larger; nasals little 

 inflated anteriorly, and owing to the great breadth of the 

 ])remaxillaries the latter are visible outside them from above. 

 Bony itilet above meatus fairly large, nearly square ; oblong 

 transversely in tucumanum. Posterior line of occiput almost 

 straight transversely, scarcely bulging backwards in the 

 centre, as it does niarkedh' in every specimen of tucumanum. 

 Incisive fissure unusually large and open, 2 mm. in breadth. 

 Palatal foramina also widtdy open posteriorly, in decided 

 contrast with those of tucumanum. Bullae much larger than 

 in the Tucuman species. 



Incisors yellow in front, unusually large, and heavier, 



