Mr. O. Thomas on African Mole-Rats. 241 
Georychus Lechet, sp. n. 
Size large. Fur fine, of medium length, about 7 millim. 
long on the back. Colour above and below dark smoky grey, 
with a brownish tinge in certain lights. White crown-patch 
very large, and extending as a white line down the neck on 
to the anterior back. Median line below also with a tendency 
to be white. Hands and feet practically naked, the few fine 
hairs whitish. 
Skull large and strongly built. Nasals long, rather 
narrow, not constricted anteriorly. Ascending processes of 
premaxillaries narrow, slightly exceeding the somewhat 
irregular nasals posteriorly. Middle portion of the skull 
rather long and parallel-sided, but the postorbital processes 
are well developed and separate off a well-defined orbital fossa 
infront. Anteorbital foramina small, their diameter less than 
that of the bars which bound them. 
Dimensions of the type (an adult male skin) :— 
Head and body 212 millim.; tail 10; hind foot 30. 
Skull: basal length 3; basilar length 88; greatest breadth 
42; nasals 17:5 x 4:3; interorbital breadth 10; intertemporal 
breadth 9 ; palate length from henselion 26°5 ; diastema 14°5 ; 
upper molar series 6:1. 
Hab. Bellima, Monbuttu. 
Type: B.M. 87.12.1.96. Collected by Emin Pasha, 
July 14, 1883, and presented by him to the British Museum, 
Further details about this species and its differences from 
G. ochraceo-cinereus may be obtained from Prof. Leche’s 
paper, where both are excellently figured on plate iv., fig. 1 
being G. Leche? and fig. 2 Heuglin’s sandy-coloured animal. 
Ill. The Species of Myoscalops. 
During the work on the skulls of the large Georychi, those 
of Myoscalops, which represents Georychus in Kast Africa, 
have been examined, and among these there appears to be a 
character to separate the mole-rats of Zambesia from those of 
Kast Africa proper. This is that the former—the true 
M. argenteo-cinereus, Peters—have a quite parallel-sided 
inter-orbitotemporal region, while in the latter there is deve- 
loped a distinct orbital concavity on each side, defined behind 
by a projecting postorbital process. Should this difference 
prove to be constant, and all the skulls and figures I have 
seen agree with it, the name for the Kast-African animal will 
be M. albifrons, Gray, based on a young specimen obtained 
by Capt. Speke, in which the above characteristics are already 
clearly discernible. 
