a 
392 On the “Ground-LHogs” or ‘Cane-Rats” of Africa. 
heavy, with greatly developed occipital crests. Posterior 
part of frontal region with deeply notched lateral inter- 
temporal gutters, whose edges are sharply defined in old age. 
FTab. Central and Southern Africa, from the Bahr-el- 
Ghazal and Uganda to Eastern Cape Colony. 
Thryonomys swinderianus raptorum, subsp. n. 
Size medium. Colour comparatively dark, strongly varie- 
gated, but the rump little more buffy than the rest of the 
back. Skull rather narrow, and the lateral intertemporal 
gutters scarcely developed. 
External measurements of type :— 
Head and body 576 mm.; tail 200; hind foot 88; 
ear 34, 
Hab. Forest region of Lower Nigeria and the Gold Coast, 
extending eastwards through the Congo area. Type from 
Lagos. 
Type. Adult male. B.M. no. 20. 3.18.39. Original 
number 4. Collected 19th December, 1919, and presented 
by Willoughby P. Lowe. 
Thryonomys swinderianus angola, subsp. n. 
Smaller. Colour rather more buffy than in raptorum. 
Skull short and squat. Supraorbital edges nearly parallel, 
the posterior gutters hardly developed. 
External dimensions of type:— 
Head and body 500 mm. ; tail 195; hind foot 80. 
Hab. Angola. ‘ype from the junction of the Luando and 
Cuje Rivers. Alt. 4500’. Another from Ndallo Tando, 
N. Angola, 2500’ (Ansorge). 
Type. Adult male. B.M. no. 20. 4. 27.2. Original num- 
ber 1. Collected 30th August, 1919, and presented by 
Capt. Gilbert Blaine. 
Skull-dimensions (all adult males) :— 
Ts. swindertanus. 
Bennett’s original ae raptorum. angole. 
specimen from Natal Type. Type. 
Sierra Leone. ; 
mm. mm, mm. mim, 
Greateshlene thi ce... nec « pain 94 105°5 99 93 
Condylo-incisive length ...... 84-2 92°35 88°5 83°'3 
Zygomatic breadth .......... 60 70 62 61 
Interorbital breadth ........ 346 4] 38 * 32:2 
Intertemporal breadth on gutters. 29°7 30°5 375 317 
Upper cheek-teeth .......... 19°5 19°2 19-7 19°6 
