40 Dr. J. E. Gray on the Species of Hyrax. 
The species may be thus arranged :— 
1. Hyrax. : 
a. Dorsal spot black. 1. Hyrax capensis. South Africa. 
b. Dorsal spot yellow. 
* Fur harsh 7... 2. H. Burtonii. North and West Africa. 
3. H. Welwitschii. Angola. 
*?. Pur eof 0443 4, H. Brucet. Abyssinia. 
5. H. Alpint. Abyssinia? 
6. HH. sinaiticus. Sinai. 
. E. abyssinicus. Abyssinia. 
1. D. dorsalis. West Africa. 
2. D. arboreus. South Africa, Tete. 
3. D. Blainvillit. (Skull only.) 
~ 
B) HUHYRAR. 4467-5 cud 
8. DENDROHYRAX ... 
These animals form themselves into three very natural 
groups or genera, according to their skulls and teeth. 
1. HYRAZ: 
Skull with a distinct narrow sagittal crest on hinder part of 
crown when adult; nose short. Diastema short, not equal 
in length to the outer sides of the first three premolars ; 
grinders in an arched line; molars large, broad, square, much 
larger and broader than the compressed premolars, the first 
one very compressed. Orbit incomplete behind. Lower jaw 
very broad behind. Bladebone elongate trigonal. 
Skull—nose short; forehead flat or rather convex below 
the orbit; orbit incomplete behind; the lower jaw much 
dilated behind. The diastema between the canines and the 
first premolar short, not so long as the outer edges of the first 
three premolars. Lower cutting-teeth elongate, narrow at the 
base, broader above, with three lobes; but the lobes are soon 
worn away, only leaving indistinct grooves on the surface of 
the teeth. The lobes of the lower cutting-teeth are distinct 
in the very young animals which have not yet cut their pre- 
molars and last grinder. The upper cutting-teeth of the milk 
series are rounded in front, broad and spathulate at the end; 
those of the adult series are trigonal, with a strong central 
keel in front. The grinders form an arched series; the true 
grinders large, much larger than the rather compressed pre- 
molars; the first (permanent) premolar (that is, the second in 
the series) small, compressed ; the first premolar in the upper 
jaw of the milk series is triangular, with three roots, the two 
hinder ones being close together. 
De Blainville, in the ‘ Ostéographie,’ figures the skeleton and 
the skull of a species of this genus under the name of Hyrax 
syriacus; but 1 am not able to determine to which of the 
four species of this genus it belongs. H. syriacus has almost 
a generic signification. 
