176 mr. oi.dfif.ld TunMAs ox [Feb. 20, 



in all the skull was broken ; but they now contribute most 

 valuable confirmatory evidence as to the external proportions and 

 the lamina formulae of the molars, agreeing in these respects 

 entirely with the perfect skin and skull brought home by 

 Mr. Mackinder. 



11. Dexdromys mesomelas Brants. 



a. 2 ■ Foot of Mt. Kenya, 7000 ft., 15/8/99. 



There is in this specimen a very faint trace of the dark frontal 

 band which induced Mr. True to give to the Kilima-njaro Tree- 

 mouse the name of D. nigrifrons. 



12. PrOCAVIA l MACKIXDERI, sp. n. 



a-g. 4 6 3$ . Teleki Valley, 13,000 ft., Sept. 1-3, 1899. 



Size large. Fur very long and thick, hairs of back over 40 mm. 

 in length ; underfill* long and abundant. General colour pale 

 grizzled olivaceous grey, the longer hairs dark, with a pale yellowish 

 subterminal band and a black tip; uuderfur except on the posterior 

 back blackish basally, whitish or buffy terminally, this colour 

 showing on the surface and lightening the general colour of the 

 animal ; on the posterior back the underfur is dark from base to 

 tip. Dorsal patch dull yellowish white throughout, very incon- 

 spicuous, not visible without parting the long hairs of the back. 

 Head darker, the muzzle coarsely grizzled black and white ; 



1 An allied species, of which we have lately obtained specimens, may be de- 

 scribed as follows : — 



Procavia jacksoni, sp. n. 



Size medium. Fur short, coarse and harsh, the hairs of the ordinary fur of 

 the back barely attaining 30 mm. iti length ; underfur comparatively scanty. 

 General colour coarsely grizzled yellowish brown, the long hairs brown with a 

 yellow subterminal band or black tip; underfur on the anterior back brown 

 basally, yellowish terminally, on the posterior blackish brown throughout. 

 Cheeks grizzled yellowish ; forehead rufous brown. Back of ears p;irtlv 

 yellow, partly brown ; sides of neck yellowish, a few of the longer hairs black- 

 tipped. Dorsal spot conspicuous, dull straw-yellow, the hairs yellow to their 

 bases. Under surface buffy yellow, not sharply defined laterally. Inner sides 

 of limbs yellowish, outer sides like body. Upper surface of hands and feet 

 grizzled brown and whitish. 



Skull with the essential characters of that of the P. abyssinica group, but, at 

 least in the female, unusually long and narrow, the nasal and frontal regions 

 particularly narrow. Temporal fossse ending about 4-5 mm. from the back of 

 the skull. Interparietal sutures open. Diastema about 11 mm. in length. 

 Teeth large and hypsodont. 



Dimensions of the type, a female, measured in skin : — Head and body 

 490 mm. ; hind foot 67. 



Skull (stage vii.) : basal length 83 ; greatest breadth 49"5 ; nasals 26 X 19 ; 

 intertemporal breadth 25 ; length of upper tooth-series (p. 1 to m. 8 ) 38 ; greatest 

 breadth of m. 1 6 - 9; height of crown of m. 3 7'2 ; length of anterior lower pre- 

 molar 2'9. 



Hub. Eavine Station, British East Africa. 



Ti,pe. Female. B. M. No. 99.8.4.100. Collected and presented by F. J. 

 Jackson, Esq. 



This species differs, in its harsher fur, different gencr.il colour, and more 

 prominent dorsal spot and narrow skull, from the only previously described 

 species with which it could be confounded, the Abyssinian P. abyssinica H. & E. 



