48 ATELEUS 



that they can be referred to any known species, and must be recognized 

 as distinct. It is a plain light brown animal, with dark head, limbs, 

 and tail, and whitish under parts. 



The specimen marked on ticket, 'type' was presented by M. Plee 

 and said to have come from Colombia. It is much faded, mummy 

 brown on head, arms, and shoulders, with a white spot in the center 

 of the forehead; forearms, upper parts of body, flanks, legs and tail 

 yellowish brown ; hands and feet blackish brown. 



Measurements. Total length, 1,346.40; tail, 163.85; foot, 177.80. 



Another specimen, better in color, has the head, shoulders, arms, 

 hands, feet and tail blackish brown, darker than seal brown ; white 

 triangular spot on forehead ; upper part of body and flanks Front's 

 brown ; legs Prout's brown nearly on front edge over knee ; inner side 

 of limbs and under parts of body, grayish white; tail above, blackish 

 brown like arms, beneath, yellowish. 



Exposure to light has changed this specimen somewhat, as one of 

 the legs is paler than the other, and possibly the back and sides may 

 have changed also, but the head, arms, hands, feet and tail doubtless 

 still retain the original color. As the description shows, it is a very 

 much darker animal than the one marked as the 'type,' and it does not 

 seem likely that the latter ever was as dark, which gives rise to the 

 suspicion that there may be a considerable variation in color among 

 members of this form. All the specimens have a triangular white spot 

 on the forehead, the lower points reaching, as stated by Geoffroy, to the 

 corners of the eyes. If this is a hybrid, as its name would seem to 

 imply, it is extremely difficult to determine what species have pro- 

 duced it. 



