On a new Gerlilfvom Bn'lisk East Africa. 210 



the palatine ami pterygoid are very peculiar; the former is 

 an elongate narrow lamina which is tirnily uiiiteJ to the 

 lower surtace o£ the vomer and also to the mesethmoid, lateral 

 ethmoid, and parasphenoid ; the pterygoid is movably articu- 

 lated with the lateral ethmoid external to the palatine. The 

 branchial skeleton is percoid. 



There is no post-temporal, and the supra-cleithrum is 

 attached by ligament to the third or fourth vertebra ; the 

 hypercoracoid is perforate, the hypocoraeoid has a strong 

 post-coracoid process, and there is no mesocoracoid ; there are 

 4 radials, 2 on the hypercoracoid and 2 on the hypocoraeoid. 



The vertebraj are numerous, 7 7 to 95 (34-44 + 43-51) ; 

 the first centrum is convex, fitting into the concavity formed 

 by the basi- and exoccipitals ; the ribs are inserted on strong 

 parapophyses. 



XXI. — A new Gerhil from British East Africa. 

 By Guy Dollman. 



( Published by permission of the Trustees of the British Museum.) 



Tatera philh'pst umbrosa, subsp. n. 



(^ . 497. Hot Springs, near Baringo. 



c? . 1372, 1384, 1395 ; ? . 1318, 1335, 1383, 1380, 1400. 

 Baringo {li. Kemp). 



A dark-coloured race of Tatera phillipsi. 



Size and proportions much as in phillipsi, head and body 

 dimensions rather greater. General colour of dorsal surface 

 very much darker than in the Somali form, the sandy colour 

 of that species is here hidden by a dark brownish wash. 

 Flanks rather lighter in colour, the buff tint more evident 

 than on the shoulders or back. Head and face very much 

 darker. Ears clothed with short dark hairs, the general 

 effect conspicuously different from the yellowish-buff ears of 

 phillipsi. Backs of hands and feet rather thinly clad with 

 white hairs ; in the Somali form the feet are thickly covered 

 with snow-white hairs. Ventral surface of body white. 

 Tail dark brown.ish black above, paler in the basal portion ; 

 apical region dark brown. Under surface of tail dirty white, 

 tinted with buff. 



Skull about equal in size to that of phillipsi ; teeth a trifle 

 smaller. 



