44 On a new Hedgehog from Southern Arabia. 
Out of the ten specimens, only three may be said to 
be black throughout, but even in them a little white may 
be detected in places; two are males, but the sex of the 
other is unknown. In all the others a great deal of white is 
present on the neck, chest, and upper abdomen. 
From the foregoing it will be seen that while the majority 
of specimens of this hedgehog are little darker in the fur than 
their near ally . wthiopicus, some individuals in the almost 
uniform blackness of the furred parts resemble the widely 
distinct species from the neighbouring country, 4. macro- 
canthus. The dark dorsal area on the spines with light sides 
will, however, always serve as a distinguishing mark of this 
new species without consulting the skull. 
The skull of £. dorsalis in its general form resembles 
that of H. ethiopicus, having, like that species, the enor- 
mously inflated bullz and pterygoids, but differs from it in 
having a much broader snout, this part of the skull of 
E. ethiopicus being finely pointed; first upper premolar with 
two roots, second very small, lying on the outside of the 
tooth-row and often absent altogether. 
In a Tunisian hedgehog (2. desert’, Loche) the snout is 
not quite so narrowly pointed as in Eastern Soudan indi- 
viduals; but this observation rests on a single specimen 
which in its other characters is inseparable from the hedge- 
hogs of the Egyptian Soudan, which externally are the same 
as the Tunisian animals referable to /. ethiopicus. 
In one skull (no. 201, ¢) the frontal sends forward a 
well-defined process which articulates with the premaxilla, the 
posterior extremity of which is pointed. In another skull 
(125, 3) a similar process from the frontal exists but of a 
more slender character. On the right side it touches the 
premaxilla, but not on the deft. In another (199, ?) the 
posterior extremities of the premaxille are rather truncated 
and separated from the frontal by a considerable interval. 
The postpalatine foramina of this species are remarkably 
long and wide as compared with the considerably smaller 
imperfections of ossification found in Z. ethiopicus, in which 
each opening is sometimes, and apparently not infrequently, 
resolved into two openings by the presence of a transverse 
ridge of bone. 
Measurements taken from specimens in alcohol :— 
