240 MR. OLDFIELD THOMAS OX THE MAMMALS [NoV. 3, 



unexpected, as also is the close resemblance it bears to the typical 

 aV. spinostis of Peru, from which it differs chiefly by its brighter, 

 clearer colour. 



22. Proechimys longicaudatus Rengg. 



d. 1011, 1024, 1027, 1034, 1046, 1047, 1114, 1190, 1197, 

 1201, 1204. 



$. 1009, 1021, 1035, 1078, 1113, 1185, 1187, 1194. 



Rengger's type was obtained on the 21st parallel of latitude, 

 therefore not far south of Corumbd. It would be interesting to 

 get absolute topotypes of it, but the Chapada series no doubt 

 belongs to the same species. It is nearly allied to my P. holi- 

 vianus, which differs from it by the cranial characteristics giA^en 

 in the description of the latter. 



23. CoENDOU BRANDTi Jent. 

 c?. 1075, 1167, 1183. 



These specimens may be considered to represent typically 

 Dr. Jentink's species, for Brandt's figures, on which the name 

 was founded, were from specimens in the Langsdorff collection, 

 and as Sciurus langsdorffi came from Matto Grosso, the Porcupine 

 may very likely have done so as well. The skull exactly agrees 

 with these original figures. 



G. brandii is certainly very closely allied to Gray's C. boliviensis, 

 but the skull differs in certain details, as to the constancy or 

 otherwise of which no opinion can be expressed until a much 

 larger series has been examined. 



24. CoElsDOU CENTRALIS, Sp. n, 



S 1147. 22 September, 1902. T^/pe. (B.M. No. 3.7.7.102.) 



A member of the group for which Dr. Jentink has used the 

 name of prehensilis. The skull less swollen than in C. hrandti. 



Size about the same as in C. hrandti ; relative development of 

 spines and hair as in that species. General colour rather darker, 

 owing to the greater extension of the black on the spines, but 

 there is no very material difference in this respect. Belly 

 browner. Tail decidedly darker, especially along the middle line 

 below. 



Skull of the same less swollen type as is figured hy Cuvier* 

 and considered by Jentink to be prehensilis. Nasals comparatively 

 long and narrow, parallel-sided. Palatal foramina very small as 

 compared with those of a Rio Jordao (Sao Paulo) specimen of 

 C. prehensilis. Teeth smaller than those of C hrandti. 



Dimensions of the type, measured in the flesh : — 



Head and body 480 mm. ; tail 530 ; hind foot (s. u.) 80, (c. u.) 

 90, from back of hallucal climbing pad (s. u.) 66. 



Skull — greatest length 94 mm. ; basilar length 82 ; greatest 

 breadth 53; nasals 32 x 25; least interorbital breadth 35; greatest 



* Mem. Mus. ix. Til. 20. fig-. 3 (1822). 



