278 Mr. 0. Thomas on Mammals from 



Dimensions of the type: — 



Head and body 244 mm.; tail 253; hind foot 44; 

 ear 19. 



Skull : greatest length 56 ; cond}do-incisive length 51 ; 

 zygomatic breadth 28*5 ; nasals 17 ; interorbital breadth 13*8 ; 

 upper tooth-series 11*5. 



Hub. as above. 



Type. Adult female. B.M. no. 20. 7. 1. 20. Original 

 number 89. Collected 1916 by Dr. E. Snethlage. 



Animals agreeing with E. bistriata in all important cha- 

 racters, external and cranial, are found over the huge area 

 extending from the liio Guapore", about 13° S. to the middle 

 Orinoco in 5° N., and westwards to the Ucayali in 75° W., 

 the present locality being about the eastern centre of the area. 

 No doubt the extremes, bistriata and orinoci, might be thought 

 to be specifically separable by their colour-characters, but 

 their skulls are so identical that I have preferred to keep 

 them under one specific heading. The new form is most 

 allied to orinoci, but differs by the characters detailed above. 



Natterer's second specimen, mentioned by Pelzeln but not 

 by Wagner, was no doubt, from its locality, an example of 

 /. b. negrensis. 



47. Dadylomys sp. 



$ . Taperinha, Santarem (Dr. Hagmann). 

 Probably D. dactylinus canescens, but in faded pelage and 

 without skull. 



48. Coendou prehensilis, L. 



<$. 150 (young). Villa Braga, R. Tapajoz. 



Two further young Coendous are also included in the 

 collection, both of them albinistic. Owing to their youth 

 and abnormal coloration they cannot at present be determined 

 with any certainty. 



More material of this genus is very much needed, as the 

 skulls are so remarkably variable that satisfactory results can 

 only be attained by the help of good series. 



49. Dasyprocta aguti, L. 

 cJ . 151. Villa Braga, R. Tapajoz. 



50. Myoprocta acouchy, Erxl. 



$ . M. 18, M. 19. Montalegre, Juqaratena, N. bank of 

 Amazon nearly opposite Santarem. 



