2(iS Mr. O. Thomas on the 



times absent or taint and sometimes distinct, but tlio strong 

 general colour is common to all the specimens. 



The following are more detailed descriptions of the new 

 subspecies : — 



Potos Jlavus aztecus. 



Size large. General colour greyish yellow, between tawny 

 olive and clay-colour of Ridgway. Muzzle dark brown, the 

 brown surrounding the eyes. Crown like body. Ears largo, 

 well haired, their backs concolorous with head. No trace of 

 a dorsal streak. Under surface and inner sides of limbs deep 

 fulvous yellnv, a darker streak present on the abdomen. 

 Hands and feet darkening to brown on the digits. Tail 

 proxinially like body, rather lighter below, and darkening 

 terminally to brown. 



Dimensions of the type (approximate), takoa on the dried 

 skin : — 



Head and body (aj)pareiifly stretched) 580 milliui. ; tail 

 435; hind foot, s. u. (c.) i>4, c. u. 100; ear 38. 



JSkull (see below). 



Hall, of type. Atoyac, Vera Cruz, Other spi'.cimens fro-n 

 Mielioacan (Mexican Museum) and Vera Paz, Guatemala 

 [Salving. 



Type. Old male. V>M. no. 88. 8. 8. 1. Collected May 

 1888 by Mr. H. H. Smith, and presented by Messrs. F. D. 

 Godman and O. Salvin. 



Potoa Jlavus merxdensis. 



Colour very much as in a Demeraran specimen of true 

 favux, but size, as judged from skull, niaikcdly less. General 

 colour more yellowish than in ('. /. aztecus, the fore-quarters 

 and hips especially suffused with yellow. Muzzle but little 

 darker, rings round eyes comparatively narrow. Ears hirg-, 

 well-hairetl, their backs rather browner than the heal. Back 

 w ith a distinct dorsal stripe commencing on the withers and 

 ending on the riimi). Under surface and inner side of limbs 

 bright bufTy yellow. Upper surface of hands and feet deep 

 yellow, the digits also yellow, not brown. Tail above greyish 

 yellow, darkening terminally to brown; beneath yellow to 

 end. 



Skull smaller and lighter throughout and with smaller 

 teeth than in P. Jluvus, the lengtii of the cheek tooth-series 

 particularly small (see below). 



