KUNGL, SV. VET. AKADEMIENS HANDLINGAR, BAND 48, N:o 5, 41 
of the crossing of the Marsabit-road, are decidedly more brown and less ochraceous 
than specimens a and b. 
Specimens ¢ and d agree nearly with regard to their colour with Extiot’s de- 
scription of P. furax from Baringo and Nandi. The general colour tends to seal brown 
and the rings of the hair are decidedly paler than in the other specimens. The tail 
appears to be rather short, about 44 em. (without hair) in the male. 
It must nevertheless be admitted that the difference is not very great, at most 
of subspecific value, and, perhaps, I should not have been inclined to go even so 
far if not other members of the fauna as well had proved to be different above 
and below Chanler Falls. There are thus different races of Rhynchotragus and Procavia 
(Heterohyrax) in the corresponding two localities (conf. below). 
There ought also to be said a few words in explanation of the degradation of 
P. furax to a subspecies. This has been done, because some of the cranial characte- 
ristics especially enumerated by Exrior have been proved by the present material 
to be variable. Exiior says that the rostrum is »broader» in furax than in doguera. 
This measurement increases considerably with age and is 7'/2 mm. larger in a than 
in 6, although even the latter is fully adult, and both hail from the same herd. It 
is true that these specimens are not real P. furax but very near relatives and stand- 
ing, as will be seen later on, between that race and doguera, and then the same 
laws for changes with age may refer to furaz as well. The distance between the 
last molar and the posterior border of the palate is also very much increased with 
age as can be seen from the table of measurements. The pit on the side of the 
upper jaw is very different in the specimens a and b being much more pronounced 
in the latter which proves that this is not a specific character. The zygomatic width 
is often rather variable and apt to increase with age when the musculature is more 
powerfully developed. 
Considering all these facts I think it is most suitable to regard furax only as 
a geographic subspecies of P. anubis. 
N. of Guaso Nyiri 
Chanler Falls 
below | above 
ao | b. oS . d. 2 
| very old ad. ad. | semiad. | 
RIMMER is aria ie she, 6 (te) < ¢ 48 Savy Git © he BAe | 211 mm. | 201 mm | 201,5 mm. 152 mm. 
Odeipitonabel length! 8. Se | 1695 » | 161 » | 160 » 120 > | 
a i ene ee en ere | 147» | 142 >» 46 > 6 | 106 >| 
oa A). 1 AT) a ocx iawn coat “ain te oh 1215 > | 5 » 1 94 | 
Palatal length (inside between median incisors). .......-.- 93.» 83 88 >» 62 » 
UMMREIRCDEMSTIONSG Ga ees Bac» oe Me wig wd use BE 6 oa $6.» «|  » 83 73 
Pe A a es eo 68 » | 654 53 | 52 » 
Interorbital width ........ Bes a Oe gee , IZ.49 10 » | wh > | 11,4 » 
PePRLGKE Ce TEMES ee cee a hi bp tee Ghee ye we wD p yore 72 » 64 > 41 » | 
K. Sv. Vet. Akad. Handl. Band 48, N:o 5. 6 
