the Lower Amazons. 279 



These specimens are unusually red, having less black on 

 the hinder back than is usual. 



Dasyprocta exilis, Wagl., and D. leptura, Wagn., would 

 both seem to be referable to this animal, for I find it quite 

 impossible to accept Dr. Allen's identification * of the former 

 with one of the greenish-coloured pratti group, merely because 

 there was a wliite line down the belly of the type. D. exilis 

 was described as " notoeo toto castaneo-fuscescente," a coloration 

 absolutely in contrast with that of j^ratti, wliile characteristic 

 of the present form. And D. leptura is also ^'' ferrugineo- 

 rufaP In consequence, the next species may be considered 

 witliout reference to those names. 



51. My opr acta pratti timanus, subsp. n. 



(^ . 96. Acajutuba, near mouth of Rio Negro, above 

 Manaos. B.M. no. 20. 7. 1. 24. Type. 



Colours throughout more vivid than in true pratti. Face 

 and crown strongly suffused with ochraceous. Nape-streaks 

 bright ochraceous buffy. Under surface bright yellowish 

 buffy, the chest-hairs buffy to the roots, the belly — apart from 

 the well-developed white median line — wholly buffy, the line 

 of demarcation on sides not sharply marked, as it is in 

 M. p. milleri. Chin whitish, almost naked. No trace of the 

 broad brownish slaty bases to the throat-hairs so marked in 

 milleri. Inner surface of thighs bright " light orange-yellow." 

 Upper surface of hands and feet dark grizzled tawny. 



Skull about as in pratti, but the bullse markedly smaller. 



Dimensions of the type : — 



Head and body 337 mm. ; tail 49 ; hind foot 8G ; ear 31. 



Skull : greatest length 76*5 ; condylo-incisive length 66 ; 

 zygomatic breadth 38 ; bulla, length on a line parallel with 

 the median axis of the skull 13 ; upper tooth-series 12*3. 



Uab. and type as above, the latter collected 9th June, 1916, 

 by Fraulein E. Snethlage. 



There would seem to be three subspecies of the greenish 

 acouchy, the true Myoprocta pratti o'i \.\i& Maraiion of Peru f, 

 with the yellowish of the belly quite narrow, its breadth at 

 most 2 inches, and with comparatively large buUas; secondly, 

 the form found in Colombia — M. p. milleri, Allen, — with 

 broad, sharply defined yellowish belly, the hairs of the throat 

 dark at base, and the nuchal streaks not strongly developed; 



• Bull. Am. Mu8. XXXV. p. 205 (1916). 



t Mr. Pocock did not record the exact locality, but I have been able 

 to learn fruni Mr. Pratt that the aj^outis were obtained at the Pongo de 

 llentema, on the Marahou, about 7b' 20' W. 



