THE DIKDIKS 
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same age, but have not been observed in other genera of 
antelopes. 
The short nasal bones, the large anteorbital fossae and 
the great size of the narial opening of the dikdiks ally them 
closely to the gazelles and separate them fairly widely from 
the other groups of small antelopes with which they are usu¬ 
ally grouped. In the structure of the snout they resemble 
closely the proboscis-bearing Saiga , which shows an even 
greater reduction of the nasal and the premaxillary bones. 
The skulls of newly born gazelles are scarcely distinguish¬ 
able in shape of nasal bones or relative size of the narial 
opening from those of adult dikdik. There are two genera: 
Rhynchotragus , bearing a large proboscis, and M ado qua y 
having the proboscis smaller and the premaxillary bones 
normal. The latter genus is confined to Somaliland and 
Abyssinia, and is not known to occur in British East Africa. 
Long-Snouted Dikdiks 
Rhynchotragus 
Rhynchotragus Neumann, 1905, Sitz.-Ber. Ges. Nat. Freu., Berl., p. 88; type 
Madoqua guentheri Thomas. 
In the long-snouted dikdiks the coloration is much more 
subdued than in Madoqua , the colors never being bright 
orange. The body size is also larger and the proboscis is much 
more developed, being fully twice as great in length. The 
skull has the nasal bones more reduced and the premaxillary 
bones widely separated from the nasals. The last lower 
molar tooth has three folds to the crown instead of two as 
in Madoqua. The genus ranges from central Somaliland 
and Abyssinia southward through the coast and Rift Valley 
drainage area to central German East Africa. It is not 
known to occur west of the Rift Valley in the Nile drainage. 
An isolated species, damarensis , occurs in German Southwest 
Africa and Angola. No fossil species are known. 
