40 ARKIV FÖR ZOOLOGI. BAND 14. NIO 4. 



white colored». This is not the case in the present specimen 

 in which the crowns of the molars have the blackish brown 

 colour SO common among rodents. 



These great and important differences as well with regard 

 to the colour of the fur as with regard to skull characters 

 do not appear to be due to individual variation. I have 

 therefore found it necessary to regard the specimen from 

 Rio Curaray as representing a separate subspecies, in spite 

 of the seemingly great geographical difficulties, until further 

 knowledge can be obtained. 



In some respects the Dactylomys from Curaray appears 

 to resemble the one which Anthony recently^ has described 

 from the province Cochabamba, Bolivia, but it also differs 

 from the same very conspicuously. The general colour of 

 C. holiviensis is said to give a »distinctly olivaceous impres- 

 sion in most lights», whereas the back and upper sides of 

 the specimen from Curaray are coarsely grizzled by the 

 whitish tips to the hairs, but with the black dominating. 

 The long hairs on the crown, »the hood», is described as 

 being »clove brown» in D. holiviensis, while the corresponding 

 parts of the present specimen are dirty white from the snout 

 and beyond the interocular region, but with a slight tinge 

 of Ridgway's (1912) »woodbrown» on the posterior parts. 

 The hind limbs of D. holiviensis are said to be cinnamon 

 buff on their upper surface, and nothing is said about any 

 rust red, such as is present on the posterior hams of the 

 specimen from Curaray. 



The tail of D, holiviensis appears to be still longer (410 

 mm) than in the one from Curaray (355 mm). 



With regard to the skull the shape of the posterior palats 

 appears to be similar in D. holiviensis and the present one, 

 but the latter has still broader postorbital ledges formed by 

 the frontals and these are broadly rounded off in outline 

 (not somewhat angular as Anthony's figure shows). The 

 upper tooth row is a little shorter in D. holiviensis, but most 

 other cranial measurements are so similar that they may be 

 due to individual variation. All taken together I think that 

 the specimen from Curaray is fully subspecifically distinct 

 from D. holiviensis, but it may be considered as intermediate 

 between th e same and the typical D. dactylinus. 



' Journ. Maram. Vol. 1 n:o 2, p. 82. 



