KUNGL. SV. VET. AKADEMIENS HANDLINGAR BAND 48. N:0 5. 37 
white ear tufts of C. kolbi are also an easily recognized characteristic. The two spe- 
cies evidently substitute each other in their different areas of distribution. 
Cercopithecus pygerythrus' luteus (ELi07). 
a 
C. centralis luteus Extior Smithson, Mise. Coll. Vol. 56, no 7 Washington 1910. 
The specimens which I refer to this race were collected partly at Kanyakeni 
situated one days march south of Meru boma (3 specimens) °*/1, at the latter place 
(1 specimen) *%/s, and at Guaso Nyiri below Chanler Falls (1 specimen) °/s 1911. 
These specimens are similar inter se, and I think they ought to be regarded as iden- 
tical with Etiior’s monkey from »Wambugu, southwest of Mount Kenia», although 
my localities are on the northeastern side of that mountain, and although the distin- 
guishing characteristics are not so sharply developed as in ELLioT’s type specimens. 
The author quoted says that the monkey which he has given the subspecific 
name luteus is »somewhat similar to C. c. Johnstoni, from the south of Mount Kili- 
manjaro but differs altogether in its buff underparts and inner side of limbs», the 
corresponding parts of Johnstoni being »grayish white». 
In my specimens the »buffish» of the under parts is well developed only in 
one of the specimens from Kanyakeni in the interbrachial portion of the breast. In 
the others the »buffish» is only represented as a slight tinge of the white which is 
best seen by direct comparison with Kilimanjaro specimens. Such a direct comparison 
also proves that the specimens of the Kenia district are more brightly ochraceous 
buff on the upper parts, and this colour extends further backwards than in the spe- 
cimens from Kilimanjaro. Thus the hair on the upper parts af the hind legs, and 
on the basal parts of the tail are partly ringed with this colour in the former, while 
the corresponding parts in the latter are almost entirely grey without any buff rings. 
The type specimens of Exxiot’s Monkey are said to have »feet iron grey». 
This is, however, probably to be regarded as a juvenile (or perhaps feminine) cha- 
racteristic, as only one of my specimens a young female from Guaso Nyiri has grey 
feet. The others being adult males have black feet. 
As EL ttot’s specimens were »young adults, females» the following dimensions 
of adult male skulls may be of value: 
Total length. . .. . . .105 mm. 109 mm. °109 mm. 
Occipito-nasal length . . . . 85 » 88» 90 > 
Basicranial > eh oo ae > 73,5 75 
Zygomatic width .... . 69 » 70 > 72,5 
Length of upper molar series . 24,5 » 25 24,5 
The scrotum is in the living specimens beautifully turquoise-blue. Since the 
above was written Hotiister has described*® a Monkey from the south side of Lake 
? Conf. Casrera: Specif. Names of cert. Primates. Ann. & Mag. Nat. Hist. Ser. 8 Vol. VI p. 617. 
* Smitson. Mise. Coll. Vol. 59 n:o 3 Washington 1912. 
