JJOVITAtES ZOOLOGICAE XXl. 1914. 155 



Greatest breadth of sknll 



Least interorbital width ..... 

 Breadth across m- (outside) .... 

 Length of npper molar series .... 

 Breadth of jialate between anterior lobes of ?«' . 

 Distance between alveoles of first upper premolars 

 Breadth across anterior end of premaxillaries 

 Length of lower molar series .... 



The horns of Mr. Wibom's female Gazelle are a little irreguhir, somewhat turned 

 over to the left. They are almost smooth on the anterior and lateral snrfoces, 

 faintl}' and irregnlarl}' ringed posteriori)', especially as regards the right horn. The 

 tips are sharp and somewhat curved forward. From base to tip they measure, in 

 a straight line, 115 to 117 mm. respectively. The distance between their bases is 

 32 mm., and between their tips 80 mm. The basal diameters are 12 and 15 mm. 

 respectively. 



With regard to the colour of the head, this doe nearly resembles the type of 

 G. albonotata. The frontal white spot is, however, more pronounced ; it reaches 

 farther down the face (cf above), and is pure white. The central facial band is in 

 its anterior portion a little less mixed with black than in the buck, but the nose 

 and the npper lips below and behind the nostrils are dusky blackish in the doe and 

 whitish in the buck ; the light facial streak reaching to the nostril in the doe as in 

 the buck. 



The colour of the body of the buck has not been described ; probably it is 

 similar to that of this doe. The latter has the back rather dark bntf. The light 

 lateral band is sharply defined, pale bnff in colour, and about 5 cm. broad. The 

 dark lateral band is well developed, black, sharply defined and prominent, about 

 3 cm. broad,* widening to 4 cm. behind, where it ends abruptly at the groin. 

 Unlike the condition found in G. rufifrons, there is not the slightest shade of buff 

 below the black band, but the whole of the under-parts are pure white. A short 

 but not very prominent pygal band of dark brown is present, separating the buff of 

 the body from the white of the posterior side of the hams. The legs are white, 

 with a broad huffish band along the front side. Unlike G. rufifrons, the knee- 

 brushes of this doe are very well developed, the outer half of which are butf and 

 the inner white, with the colours sharply defined from each other. The base of the 

 tail seen from above is of the same colour as the back, otherwise the tail is entirely 

 black and tufted at the end. 



Mr. Wibom obtained the specimen described above on March 15, 11)13, about 

 15 kilometers up the Bahr-el-Zeraf from its mouth. These Gazelles were not 

 numerous, and only found near the foot of the mountains. The natives called them 

 " Reel " (English pronunciation). 



If there has been any confusion between G. albonotata on one side and G. rnfi- 



jrons or G. tilonura on the other, this will henceforth be unnecessary. The typical 



G. rufifrons is, of course, excluded from any close relationshiji with albo)wtata by 



the absence of knee-brushes in the former. The colour-differences have already 



* On llie (liy -"kin ; but perhaps a little broader in life. 



