REDUNCINiE 255 



probably referable to K. k. nigroscapidatus, which came 

 under the writer's observation in 1911. One of these, 

 obtained near the junction of the Bahr-el-Arab with the 

 Baln^-el-Gliazal, was (as shown by the worn cheek-teeth) an 

 older buck than the other ; it had blackish markings on the 

 sides of the neck, and the tips of tlie backs of the ears fawn, 

 but the rest dirty white — quite difterent from the pure 

 white of Icucotis. The second and younger buck, killed 

 on the' Jur Eiver (also in the northern portion of the 

 Bahr-el-Ghazal), had no black on the neck, and the ears 

 were foxy throughout. In both specimens, which were 

 killed during August and September, the horns were stouter, 

 shorter, and less curved than those of Icucotis, and, there- 

 fore, more like those of thomasi. Both apparently belong 

 to the same race, the differences in colour being due to 

 difference in age, and they seem to indicate a race inter- 

 mediate between the Icucotis type on the one hand, and 

 thomasi on the other. 



Heller, Smithson. Misc. Collect, vol. Ixi, no. 7, p. 12, accepts 

 the view that all the Nile kobs are races of Kohus koh. 



The following is a tentative key to the named races, some 

 of which are only provisionally recognised as such : — 



A. Backs of ears fulvous; white orbital area 

 usuaUy small. 



a. Size relatively large. 



a\ Horns short, slender, and long- 

 pointed ; light patch above eye 

 narrow, and that below eye pale 

 buff K. h. thomasi. 



bK Horns stouter, short-pointed, and 

 puku-like ; no white above eye . . . 

 K. 7c. loderi (including poiisarguesi). 



b. Size (typically) smaller. 



a^. General colour wholly fulvous. 



a^. Size smaller ; a huffish white area 



above eye K. k. kob. 



&2. Size rather larger; flanks paler; 



skull narrower K. Tx. adolfi. 



C-. Size smaller; flanks darker K. h. bar-Tieetce. 



d-. Horns larger and heavier, general 

 colour paler, and white patch 

 above eye pure, and extending 

 below end of tear-duct K. Jx. neumanni. 



