69 
b?. Tip of horns hooked inwards or upwards, nearly or quite to a 
right angle. 
a*. General colour pale fawn, the lateral band and other mark- 
ings also fawn. (Nubia.) . . . 94. G. isabella. 
64. General colour brownish fawn, the lateral band blackish. 
(Muscat: 7 2" eno DanC WSCALENSTS: 
b?. Dark lateral band black and strongly marked. 
a?, Horns abruptly hooked inwards at the ends. (Abyssinia. ) 
96. G. tilonura. 
6?, Horns not abruptly hooked at end. 
a*, No nose-spot ; face uniform rufous. 
a>. Size smaller. (Senegambia.). . 97. G. rufifrons. 
6°. Size larger. (Algeria.) . . . 98. G. rufina. 
64. Nose-spot black. (Masailand.). . 99. G. thomsoni. 
U. Dark colour of back more or less invaded by white of rump. 
a*. A dark pygal band present. 
a®, Dark colour of back continued in middle line on to the top of 
the tail. Size smaller. (KE. African Coast.) 
100. G. petersi. 
63. Dark colour of back shut off from tail, which is enclosed in the 
white anal disk. Size larger. 
a*, Dark lateral bands obsolete, or, in youth, present below the 
light lateral band only. (Interior of East Africa.) 
101. G. grant. 
b+. Dark bands present both above and below the light lateral 
band, uniting with each other behind. (Northern British 
18, ANGTGE)) 6 = 6 6 o 6 0 oF 6 JIE CR anata 
6?. No dark pygal band. 
a®. Tail black-tipped. Horns hooked inwards. (Abyssinian Coast 
and Somaliland.) . . . . . . . 103. G. soemmerringi. 
6°. Tail all white, or merely tipped with fawn. Horns hooked 
upwards and forwards. 
a*, Neck and anterior back alone rufous; lines of demarcation 
indistinct. (Kordofan.) . . . . 104. G. rujicollis. 
