E. LÖNNBERG, MAMMALOGY OF ECUADOR. 25 



specimen a except on the tail. In specimen b the dorsal 

 stripe is well marked on the body, but the whole of the 

 upper side of the tail is uniformly brown darkening towards 

 the tip. On the sides the brown tips of the hairs are less 

 dark, so that the general effect resembles »bistre »1. c. 328, 

 2 & 3), which is similar to Ridgway's »raw siena». The 

 colour of the lovver parts is »yellowish buff» (1. c. 310, 1—3). 

 Specimen / is similar but the brown tips are darker and 

 more numerous so that the general shade of the upper side 

 is darker. This is still more the case with specimen c. Spe- 

 cimen g has the ground colour of the upper parts more 

 greyish almost approaching »putty colour» (1. c. 311, 4), but 

 somewhat duller and a little more brownish. The brown 

 tips form a dorsal stripe, which is especially well marked 

 on the tail. The lower parts are the palest shade of »yell- 

 owish buff». 



Specimen d is most different from the others. It has a 

 yellowish grey colour which is difficult to describe; perhaps 

 it may be called Ridgway's »drab» suffused with a shade of 

 »chamois». The dorsal stripe is broad and extends on the 

 tail. 



The lower parts are buffy. I suspect that this specimen 

 looks somewhat similar to Thomas' Potos jL mansuetus, which 

 also is from a locality »W. of Quito», and has been described 

 as »near Ridgway's drab». Considering the variation in 

 colour which these specimens display, it appears uncertain, 

 whether this latter subspecies will prove to be valid. The 

 degree of hairiness of the feet appears also to be somewhat 

 variable, but it is difficult to control on the present speci- 

 mens. In one or two of the brighter specimens the distance 

 from the naked part to the back of the heel measures about 

 22 mm, thus a measurement, which is intermediate between 

 those that are said to be characteristic for Thomas' two 

 species. 



With regard to the dimensions of the skulls Thomas 

 mentions that the skull of an old female of P. /. modestus 

 was of the same size as that of the male. It is possible 

 that this was something anomalous, because in the present 

 collection all six male skulls are considerably larger than 

 the female skull, although the latter is old with worn teeth. 

 It is also another sexual difference visible on these skulls. 



