Species and Subspecies of Monkeys. 265 



Gen. char. Similar to E. pyrrhonotus, but with a much 

 darker rump and tail ; more black ou .shoulders, and uudcr 

 parts of IkxI)' buH-piuk with a yellow line down centre iustead 

 of white. 



Coti/nr. Head, face, and cheeks like E. pyrrhonotus^ with 

 wljite |)atcli on end of nose ; the black brow-line is not dis- 

 tinct between the eye and ears, and turns up over the crown 

 from the outer corner of the eyes as in the allied form ; top 

 of head foxy red ; head above ears, nape and hind-neck, 

 and shoulders ocbraceous bull', hairs yellow-tipped ; lower 

 back to rump and flanks pinkish, liairs tipped with yellow, 

 this colour {^ivinj; a yellow hue to all the up|)er parts ; rump 

 viuaccous rufous, grading into bay at tail and hips; sides of 

 neck and chest lemon-yellow, some hairs tipped with black ; 

 outer side of arms lemon-yellow ; inner side of arms and 

 the hands white; under parts of body buft'-pink, with a 

 yellow line down centi'c of belly; chin, throat, and centre 

 of chest white, this hue narrowing to a point on lower part of 

 chest as it is encroached upon by the lemon-yellow colour 

 from each side ; outer side of thighs in front to knees like 

 rump, on sides pale yellow, below knees the legs and feet are 

 white ; inner side of thighs and legs greyish white; tail bay, 

 slightly paler at ti|). 



Measuremenls. Total length 1-110 mm.; tail 740; foot 

 145 (skin). No skull. 



Type iu 13ritish Museum, no. 0. 2. 21, 2. 



This is a large species resembling E. pyrrhonotus on upper 

 parts, except on rump, which, with the tail, is much darker, 

 in fact quite a ditfercnt colour; the thighs also are not like 

 those of its relative, and the sides of neck and arms arc 

 lemon-yellow, quite ditlerent from the grey chest and 

 yeIlowis.h-\vhite arms of the allietl species; the uiuler parts 

 of the body are altogether ditlerent, a colour ditlieult to 

 describe, but which I have called '' butt- pink." 



The only species of Erythroccbus dwelling near E.formosus 

 is E. buumslarki from Masai Land, but as that animal has 

 no black ou brow or head it cannot even be comparable with 

 the present species. 



Erythrocebus albiyenus, sp. u. 



Type locality. Egyptian Soudan, exact locality not 

 known. 



Gen. char. Black brow-band extending from corner of eye 

 to crown, not to ear; thighs mostly white ; hairs ou hiud- 

 neck and shoulders very long, mane-like. 



