ATE LRUS 45 



various names. Top of head and upper part of tail buff; a patch of 

 erect hairs on forehead black; ring around eyes and lips flesh color, 

 rest of face black ; upper and lower parts of body light grayish drab ; 

 hands, elbows, feet, knees, and apical portion of tail above black. Ex 

 type in Paris Museum. 



This is also the A. melanochir style described by Desmarest from 

 the same specimen that served Kuhl for his type of A. geoffroyi. A. 

 ornatus Gray, has the face black, the base of hairs on head yellowish, 

 on forehead and nape all black or brownish black ; whiskers pale red- 

 dish yellow, upper part of back and shoulders Vandyke brown, hairs 

 tipped with golden ; rest of back, flanks, inner side of arms above 

 elbows, and inner side of thighs and base of tail beneath, brownish 

 red ; under parts reddish, rest of arms, outer side of legs, hands, feet 

 and upper parts of thighs, and tail above black. This description is 

 from Gray's type in the British Museum. 



Between this style and the typical one all kinds of gradations are 

 found, some of the most extreme character, such as grayish drab upper 

 parts, or a cream color on the under parts. Specimens of A. ornatus in 

 the British Museum vary considerably from the type, being much 

 lighter above the shoulders where they are yellowish brown, and in no 

 place does the red color attain the depth exhibited in the type. Other 

 specimens have the upper part of back dark brown, grading into a 

 yellowish brown on lowest back and sides, and under parts yellowish 

 gray. The type of A. albifrons Gray has a yellowish white line on the 

 forehead continued by a few straggling hairs on sides of face to mouth ; 

 upper parts dark brown grading into drab and whitish brown on rump, 

 yellowish gray beneath; tail dark brown like upper part of back; a 

 variation of the A. melanochir or typical A. geoffroyi style. The 

 type of A. albifrons is stated on the ticket as from Medillen, and a 

 specimen from Bogota is almost exactly like it but has no white on 

 the forehead. The extreme of the different coloring among individual 

 specimens if considered by themselves might be readily regarded as 

 indicating distinct forms, but a series of examples soon disposes of 

 any such view, and they can only be considered as representing the 

 changeable styles of coloration exhibited by a species subject to 

 extreme variations. 



Measurements. Skull: total length, 117; occipito-nasal length, 

 103; Hensel, 79; zygomatic width, 76; intertemporal width, 51 ; palatal 

 length, 33; breadth of braincase, 64; median length of nasals, 21; 



