316 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
noticeable that most of these were youngish animals of small horns, 
no doubt the less experienced or less wary members of the herds. 
Occasionally aged animals are also killed, possibly because they are 
less able to escape through battle wounds or sickness. The result is 
therefore that in nature, the greatest mortality is among the youthful 
and inexperienced or among the aged and outworn. ‘The finest 
specimens tend thus to be left to perpetuate the herd. It is worth 
noting that the effect of human game-protective laws is more or less 
the reverse, for the sportsman is usually content to let the poorer 
heads go, and to cull out those with the finest horns. In addition to 
lions, the Ariel evidently have much to fear from the crocodiles that 
lurk in all the large pools. In the stomach of one shot at Gosar, Dr. 
Phillips found horns of three Ariel, a doe and two small bucks, appar- 
ently. If possible the Gazelles will drink at a shallow pool in pre- 
ference to a large deep one, in which there are likely to be crocodiles. 
It would be interesting to know how active these Gazelles are by 
night. While marching by moonlight along the Dinder, we once 
came upon two that seemed to be grazing, and again in the dim light 
preceding dawn I found a few single animals moving about near the 
stream. 
The type locality of this species is the border of the Red Sea, but it 
has not yet been shown that the Ariel of the eastern Sudan is different, 
although two other races are described from more southern areas. 
CERVICAPRA BOHOR (Riippell). 
Bohor Reedbuck. 
Redunca bohor Riippell, Mus. Senckenbergianum, 1845, 3, p. 182. 
The Reedbuck is no longer common on the Blue Nile, and we met 
with it at but two places, El Mesharat and Bados. It is a most , 
unsuspicious animal and no doubt one that will soon be much reduced 
in numbers. It has a way of standing broadside to the intruder, the 
hind feet one in advance of the other, and with graceful head turned, 
it sniffs the air and watches until certain that there is cause for alarm, 
when it bounds away with tremendous leaps. On the Dinder it was 
very common above El Kuka, and on the great open ‘meres’ and along 
the grassy jungles by the stream bed they were found feeding through- 
out the day. They seemed to have been undisturbed here for a long 
period, and in contrast to their behavior on the Blue Nile, where they 
a 
