KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 48. N:o 5. 169 
in connection with the fact that in this arid region food must be scarce for these 
animals. The buck killed there had chiefly fed on the leaves of an evergreen bush 
which grew at a dry river-bed. 
The first two bucks killed at Lekiundu river (Pl. XIV, fig. 5) measured both 
of them when freshly killed 170 cm. in a straight line from the muzzle to the tip 
of the tail, and the length of the tail corresponded to 26 cm. out of that. The 
paler bucks from Chanler Falls were certainly not smaller, although I have no body 
measurements of them. The buck from Njoro again which, as already mentioned, 
was my smallest specimen has the basal length of its skull about 12 mm. shorter 
than the type of G. g. brighti. 
Lekiundu river S. of Guaso Nyiri | Njoro |N. of Guaso Nyiri 
| Tlf near Chanler Falls 
2 2 or MEG LES Net I LA | Så AV 
mm. | mm. mm. | mm. | mm. mm. TN 
Condylobasal length of skull . . . . . - 222 221 = | 252 | 242 255 254 
Basal length of skull. . . . .. . . SE [906 205 = "| 2380) 228-01 |711936 238 
Groatestroreadth Of skull; < .-. . ed « a ss s » & 99 99 1077 | TOT | 108 | 1071 108 | 
Distance from orbit to tip of premaxillaries . . . 126 10) (SR a 377 128 129 | 136 137 
Least interorbital width 53 56 66 | 66 63 | 65 62 
Keno thrOfEnASAlStue fos steks se a gi Se 51 51 id 56 54 54 67 
lUPPerEm Ola SOLCSk, s 6. de SS et säck 76 74 73 79 fe) 82 79 
A study of the cranial measurements recorded above shows that, with the ex- 
ception of the specimen from : Njoro, the other bucks are very much alike. The 
greatest variation is found in the length of the nasals. One of the bucks from Le- 
kiundu has long nasals 74 mm., one of those from Chanler Falls has also comparatively 
long nasals 67 mm., but in the others they must be termed short. Skulls of 
the typical Grant Gazelle from Kilimanjaro, often have rather long nasals measuring 
more than 70 mm. It might thus appear possible that this should -be a characteristic 
of the typical race, and shorter nasals on the other hand of the smaller more northern 
races. Some of my specimens are then intermediate in this respect as well. But it 
must be remembered that the variation in this respect is rather great even among 
the typical Grant Gazelles, and that fullgrown bucks of the latter race may be found 
with the nasals measuring only little more than 60 mm. 
Short nasals stand in connection with a movable muzzle, and for a browsing 
ruminant such an organ is of importance. The Grant Gazelles of the open plains 
are grazers, but those of the thorn-bush are at least partly browsers. This may account 
for the difference in the length of the nasals in different races if constant. 
It may be concluded from this that intergrading links between the typical &G. 
g. granti of the steppes of Central East Africa, and the paler and smaller races G. 
g. brighti and G. g. lacuum of the arid regions further north can be found so that no 
sharp limits can be drawn between them. The, as it seems, still incompletely known 
K. Sv. Vet. Akad. Handl. Band 48. N:o 5. 22 
