128 EINAR LÖNNBERG, MAMMALS COLLECTED BY THE SWEDISH ZOOLOGICAL EXPEDITION ETC. 
the fore legs, which in England are spoken of as warts or chestnuts.> And a little 
further below, on the next page in the diagnose the author quoted expresses him- 
self as follows: »Warts on fore legs very small». Although the »warts»> are smaller 
than those of the Zebras of the burchelli group, such a general statement as this 
must, however, be taken cum grano salis as will be seen from the following measu- 
ments of these organs in my specimens. In one of them, an old stallion, they may 
be termed small as the diameter of the wart on one foreleg is only 8 mm. in diame- 
ter, but on the other it is 12 mm. In the next specimen the wart is 15Xx8 on one 
side and 18x14 on the other. In a third specimen it is 29Xx17 on one side and 
32x18 on the other, and in a fourth about 34x18 on both sides. In these latter 
cases the warts hardly can be termed »minute». 'The great variability in size dis- 
played in these specimens is quite remarkable because, in spite of the fact that 
these organs probably must be regarded as rudiments, their relative size, presence or 
absence has been regarded as a very important characteristic, a view which to some 
degree now must be modified. 
The ergots are always very large in my specimens of Grevy's Zebra and have 
a diameter measuring from 30 to 40 mm. 
As has been stated in the literature, the mane of the young foal of Grévy's 
Zebra is continued as a crest all along the back to the root of the tail. This dis- 
appears with age, and in the old individuals there is nothing left of this juvenile 
crest on the back. But in a young adult stallion remains of this crest are to be 
found. The hairs of the black stripe on the posterior back (but not anteriorly) attain 
a length of about 4 cm. and are thus strikingly longer than the very short hair of 
other parts. 
The collection now described contains two fine stallions and a mare of Grévy's 
Zebra from the southern side of Guaso Nyiri near Lekiundu river and a stallion 
from the thornbush country north of Guaso Nyiri at the water-place of the Rendiles 
called Njoro. All these specimens are alike in having the upper or dorsal portion of 
the tail-tuft more or less white and the under or ventral portion black. The black 
stripes on the sides of the neck are much broader than the white. These characte- 
risties are thus in accordance with those given for »E. g. faurei>, and I have there- 
fore mentioned this name but with hesitation, as I do not know, if it really belongs 
to a different race, or if is simply is synonymous with ZH. grevyi. The latter is the 
more probable as the type-specimens for both names have a similar origin, as far as 
is known, and the eventual difference in geographical distribution is as yet only 
hypothetical. 
The measurements of a male (Conf. Pl. VIIT Figs. 1, 2 & 3) and a female skull 
of Grévy's Zebra from this collection are given in the following table: 
