174 EINAR LÖNNBERG, MAMMALS COLLECTED BY THE SWEDISH ZOOLOGICAL EXPEDITION ETC. 
The dorsal stripe is quite absent in one of the specimens, in another it is rather 
weakly represented on the posterior portion of the back, in a third it extends from 
the middle of the back to the sacral region, and in the fourth from above the shoul- 
ders to the loins. 
The black marking on the cannon-bone is only slightly developed on the fore 
legs, in some instances there is only a black shadow streak, in others it deserves the 
name of a black spot but not very large. On the hind legs below the hocks one of 
my specimens is shaded with black on the outside down to the false hoofs. Another 
has a rather big black blotch 15 X4'/2 em. on the outside of the cannon bone below 
the hocks. In the two others this portion of the hind leg is only more or less faintly 
shaded with black. This variability is of interest especially as these markings re- 
mind about the condition of other species. 
The following cranial measurements of my specimens prove my best bull to be 
larger than HOLLISTER's type, but not to such a degree as to cause any doubt as to 
the racial identity. 
Ci ? 2 2 
mm. mm. mm. mm. 
Condylobasal lengtb — c. « c farm ssucge se SE 376 | 379 372 349 
Greatestubresadthiofiskulköf Ste 152 156 152 145 
From orbit to tip of premaxillary . . . . . . SEEN 240 | 241 232 223 
Beast interorbpital prea Cult. Fetter ki. Fes SANNE 104 107 107 103 
Tength Bftnasalsttttk dT: 36 SKOR Na 159:-sOELS9 133 131 
Lengthuof uppersmolarrseries. artis. field ds > 10714 |rFloS 98 105 
IB a5sdulal oj Bao) HERA FL OC OA VM diGÉa 0 dc 0 BIG IA SO AA 820 810 
SPLreae Eat POESI SS SS 215 200 223 220 | 
All these specimens are fully adult specimens with rather strongly worn teeth. 
The smallest and the biggest cow were in company when shot. The individual varia- 
tion in size is thus rather great, as usually is the case with those animals the growth 
of which is continued through several seasons which are apt to offer different con- 
ditions of life. With regard to animals which live in such a country as these Oryx 
Antelopes do, this fact is quite easy to understand, because a long and severe drought, 
which is nothing rare there, may make the pasture extremely scanty and of bad 
quality. This naturally results in starvation for the antelopes, and a stunted growth 
of the young animals, while those which grow up during a period of favourable rains 
get abundance of food. | 
We met with Oryx Antelopes of this kind on the acacia steppe round the tribu- 
taries Luazomela, Itiolu, and Lekiundu rivers to Guaso Nyiri. In some places they 
wery quite numerous in this country. They were also seen on the northern side of 
Guaso Nyiri but were not so numerous in the thornbush there as on the steppe on 
the southern side. 
They occur sometimes single or two or three together, oftener in small herds 
containing from five to a dozen or more. If the animals are common in a locality 
