LÖX>IBERG, OX SOME MAMMALS FROM THE AR(^ENTINE CHACO. 9 



rufous like tbe back in tlie old male, but in tbe 3'oung fe- 

 male it is ratber dark brown. The sides of tbe neck be- 

 come in botb gradually paler towards tbe under surface and 

 blend finally into tbe wbite of tbe tbroat. Tbe lengtbened 

 bairs of tbe forebead are dark brown, in tbe young female 

 witb blackisb tips. Tbe upper side of tbe nose to tbe 

 muffie is in tbe young female dark brown, almost similar to 

 »warm sepia» (Oberthur & Dauthénay: 305, i) wbich colour 

 l)ecomes gradually paler towards tbe sides, and below tbe 

 eyes blends witb tbe colour of tbe neck. Above tbe eyes 

 on botb sides of tbe frontal tuft tbe colour is more cinna- 

 mon rufous. Tbe upper lip bebind tbe muffie is ratber 

 broadly edged witb wbite. 



In tbe old male tbe upper side of tbe nose in front of 

 tbe tuft is covered witb short wbite bairs among wbicb some 

 dark brown ones are mixed in, tbus a broad wbite or wbitish 

 band is formed on top of tbe nose. The sides of tbe head 

 are of tbe same påle rufous-cinnamon as tbe sides of tbe 

 neck witb some wbite bairs mixed in bere and there, espe- 

 cially above tbe eyes and on tbe cbeeks. Tbe upper lip 

 bebind tbe muffie is broadly wbite. 



In botb specimens tbe back of tbe ears is dark brown, 

 about »warm sepia» (Oberthur & Dauthénay: 305, i), in 

 tbe old male, bowever, tbis ground colour is ratber tbickly 

 sprinkled witb wbite sbort bairs. Tbe inner side is lined 

 witb longisb wbite bairs. 



The lower side of tbe body is påle rufous as tbe flanks 

 witbout any darker area in tbe middle; tbe belly is wbite 

 as is also tbe case witb tbe inside of tbe hind legs. 



Tbe före legs are entirely påle rufous, somewbat sprink- 

 led witb wbite in the old male on tbe lower carpus and tbe 

 digits. Tbe bind legs are similar witb tbe exception tbat in 

 tbe tarsal and upper metatarsal region of tbe young female 

 tbe colour of tbe posterior parts tend to be dark brown, tbe 

 rufous extending as a broad band on tbe front side. On 

 tbe front side tbe tarsus and tbe toes are mucb sprinkled 

 witb wbite in tbe old male. 



Tbe upper side of tbe tail is rufous like tbe back. Tbe 

 lower side is wbite and from tbe root of tbe tail a narrow 

 wbite stripe extends downwards on tbe posterior side of 

 tbe barns, the insides of wbich are wbite. 



