244 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 58. 



color where series of the forms are collected, and there will be some 

 intergradation in the dimensions of the skull and teeth. 



The northern form may therefore be considered as a subspecies of 

 the southern and ma}^ have the above name applied to it. 



The chief skull dimensions of the Catamarca specimen and of the 

 type of niensalis are, respectively, as follows: Greatest leng-th, 244 

 and 240; condylobasal length, 225, 224; greatest breadth, 122, 123; 

 nasal opening, 92, 87; palate length, 116, 111; length of molars, 

 54, 45. 



Type locality. — Incapirca, Zezioro, Junin, Peru; altitude, 17,700 

 feet. Other specimens in the British Museum from the Puna region, 

 Peru (E. P. xishmore), Cordillera, north of Titicaca, 17,000 feet 

 (Maj. H. S. Toppin), Choquecamate, Bolivia (P. O. Simons), and 

 "Bolivia" (T. Bridges). 



ry/?e.— Male adult. British Museum No. 97.10.3.18. Collected 

 May 30, 1890, by J. Kalinowski. 



Male and fejnale from La Raya Pass, 16,000 feet (Nos. 194296-7). 



59. OROLESTES INCA Thomas. 



1917. Orolestes inca Thomas, Smiths. Misc. Coll., vol. 68, No. 4, p. 3. April 

 10, 1917. 



GeneHG characters. — Like Coenolestes^ but proportions of teeth 

 different. Externally quite as in Coenolestes. 



Skull (pi. 15, fig. 5) very like that of Coenolestes; zygomata 

 broader and more flattened, especially anteriorly, where the height 

 is some five or six times greater than the thickness. In Coenolestes 

 the bar more nearly approaches the cylindrical, its thickness being 

 from a half to three-quarters the height. Anteorbital vacuities 

 present, as in C. ohscui^s. Opening of anteorbital foramina slightly 

 further back, over the anterior third or middle of the first molari- 

 form tooth.^ Palatal foramina and vacuities quite as in Coenolestes. 

 Lower jaw without special peculiarities, though the two rami are 

 perhaps less extensively in contact, and are in consequence less firmly 

 united. 



Teeth similar in number to those of Coenolestes, the formula, as I 

 should now read it, being I. ^\ C. \] P. 1; M. | X 2 = 40. 



Upper incisors as in Coenolestes, except that the fourth is nar- 

 rower, more pointed, and in fact more like a premolar than the third, 

 and stands a little way back from it, while in Coenolestes it is simi- 

 lar to and stands close behind the third.^ Canines short, scarcely or 

 not longer than incisors, double-rooted, premolariform in shape, 

 quite unlike the long, single-rooted, normally-shaped canines of 



» M » of the Catalogue of Marsupials and of my original description of Coenolestes, p * 

 as I now consider it should be reckoned. 



*The figured skull of Coenolestes, as then explained, was abnormal in this respect. 



