750 DR. A. GtJNTHER ON NEW MAMMALS. [Nov. ", 



milliin. 



Total length of skull 56 



Length of nasal bones 20 



,, frontal suture 1 ti 



Distance between incisor and first molar 12 



Length of upper molar series 9 



,, lower molar series 9 



An adult male in spirits and the skin of an adult female were 

 brought by Mr. E. Bartlett from Chamicuros, Hualiaga river. 



I believe that the specimen in the British Museum from Bolivia, 

 noticed by Mr. Waterhouse as E. inermis (Mamm. ii. p. 498, pi. 16. 

 fig. 5), is not specifically distinct from the Hualiaga specimen. Its 

 fur is somewhat less harsh than that of the latter, and its throat is 

 white ; but the skulls of both examples are entirely alike. Unfor- 

 tunately the tail is lost. The true Echimys inermis of Pictet has a 

 considerably longer tail than E. brevicauda. 



Nor can there be any doubt that the two specimens from Chi- 

 nore, which Mr. Waterhouse determined as E. brachyurus, are only 

 the young of the same species. I removed the skull from the larger 

 individual, and found only three molars developed. These examples, 

 as well as the one named " E. inermis," are from the same collection, 

 made by Mr. Bridges in Bolivia. 



Echimys semispinosus (Tomes) differs in having the spines more 

 strongly developed, and in its coloration. 



Echimys ferrtjgineus. (Plate LXXIV.) 



This species is allied to those which have been described under the 

 names of hispidus, spinosus, and brachyurus, but is distinguished from 

 the first by its shorter tail, from E. spinosus (Licht.) or brachyurus 

 (Wagn.) by its shorter hind foot, and from E. spinosus of Kengger 

 by a longer tail. 



The whole of the upper and lateral parts is covered with spines, 

 which are strong and broad on the middle and posterior parts of the 

 body, becoming weaker towards the head and limbs, only the foremost 

 part of the nose and cheeks being covered with hairs. Tail covered 

 by large scales, with intermixed longish hairs sparse on the proximal 

 half, but more dense towards its extremity, which terminates in a 

 single very long fine hair. Upper parts and sides of a bright rusty 

 red, shaded with greyish along the middle of the head and back and 

 on the sides of the neck, each bristle having a greyish ring near the 

 point, which is red. All the lower parts and limbs salmon-coloured. 

 Lower lip and toes whitish. Tail grey. Ears of moderate size; 

 claws of proportionate strength. 



in. lin. 



Length of head and body t> 3 



tail 4 



,, hind foot 1 3 



,, longest bristle 11 



Width of longest bristle (I I 



