 The coloration of the upperparts is generally uniform , with some scattered darker hairs . There is a yellow ring around the eyes , which is more prominent than in A. sylvanus . The underparts are not strongly demarcated from the upperparts in color and are yellow @-@ brown to gray . There are some scattered white hairs on the chin . Although this white spot is better developed than in A. sylvanus , A. spegazzinii lacks the conspicuous white spot seen in A. simulator . The color of the feet ranges from white and yellow @-@ brown to gray . Ungual tufts of hairs cover the claws ; these hairs are grayish @-@ brown at the bases and whitish at the tips . The amount of hair on the tail is variable , but it is dark brown above and white to yellow @-@ brown below . High @-@ altitude animals tend to have hairier ears and tails . 
