LÖNNBERG, ON SOME MAMMALS FROM THE ARGENTINE CHACO. 13 



oonspicuus racial difference between the grey broeket of 

 the Argentine Cbaco and the typical M. simplicicornis Tlli- 

 OER of Paraguay. 



Cerdocyoii tlioiis froiito n. subsp. 



Among the speciraens presented by Mr. A. Ros there is 

 also a wild dog of the »Crabeater» group, which is of con- 

 siderable interest. It is labeled: »Aquarä chai'. Chaco Austral, 

 Rio de Oro. Rep. Argen. Julio 1896». 



It is a very dark animal. The upper side of the nose 

 from the snout to between the eyes »warm sepia» (Dau- 

 thénay: 305,3). The lips are margined with this same or 

 partly a somewhat more blackish shade, otherwise the whole 

 face and head is coarseJy grizzled by means of white sub- 

 apical rings to the black hairs. At the back of the ears 

 there is a large, light spöt, the colour of which most nearly 

 corresponds to a light shade of »snuff brown», or »deep 

 bistre» (Dauthénay: 303, i). The remainder of the back 

 of the ears is blackish brown sparsely grizzled with whitish 

 subterminal ring. The margins and the lining of the inside 

 of the ears display a still lighter shade of »snuff brown» 

 than the one quoted above. Below the ears there is a more 

 vividly coloured spöt which may be termed »cinnamon» (Dau- 

 thénay: 323,2). The general colour of the body is grizzled 

 grey, overlaid with blackish. On the sides the black tips 

 are not quite so long, and therefore a grey colour prevails 

 there, but along the back the black tips are so long that 

 they cover the white rings more or less completely; thus the 

 mesial upper parts are black. The lower lips are black; the 

 whole interramial space »warm sepia», sprinkled with whitish 

 rings. The lower side of the neck is, with the exception of 

 a larger central white spöt, påle isabelline grey. The long 

 hairs of the belly are isabelline whitish. 



The inside of the före legs is a little more buffish than 

 the palest shade of »snuff brown». The outside is grizzled 

 like the body a little below the elbow, but the distal parts 

 become thence gradually quite black as well on the outer 



fact that Allen's specimen liad its «teeth much vvorn» and thus the tooth 

 row already strongly shortened, while tlie present specimens liave their 

 teeth quite fresh and very little worn. 



