122 CLASS MAMMALIA. 



and is represented in the new by the Cariacou-deer, and 

 by the Brockets of South America. 



The Ahu or Tartarian Roe. (Cervus Pygargus.) Al- 

 though this animal must be considerably larger than the 

 Roebuck of Europe, and the great expanse, solidity, and 

 ramifications of the horns, produce a very different aspect, 

 yet their character is fundamentally the same : this affinity 

 is further supported by the absence of tail and of lachry- 

 mary sinus. Pallas and Gmelin have both described the 

 Ahu, no doubt from the name in the Tartar dialects, and 

 even in the Persian, being generical : the latter, in particu- 

 lar, seems to have known only a variety of the Roebuck ; 

 but the former, although we learn from the Baron, that 

 ultimately he too viewed his Pygargus as a mere variety, 

 described nevertheless the true species of Pygargus, but in 

 its junior state. 



According to Pallas the Pygargus is a native of Hirca- 

 nia, Russia, and Siberia, inhabiting the loftiest regions, 

 and descending in winter to the plains. In form it re- 

 sembles the Roebuck, but is larger. Its colour is brown, 

 with the under parts of the body yellowish ; the hinder 

 parts of the thighs are white, forming a large disk on the 

 buttocks ; the space round the nose and sides of the lower 

 lip are black ; the lips themselves white. In winter the 

 fur assumes a hoary appearance ; the ears are lined with 

 short white hair, and the orbits surrounded with long 

 black hairs. The whole coat of the animal is excessively 

 thick, and in the spring grows remarkably rough and erect. 

 It has no tail but a mere cutaneous excrescence. Of the 

 horns he says, merely that they are strongly tuberculated at 

 the base : but, referring to his figure, we find them broad 

 with the inferior snag high upon the beam and much de- 

 veloped, and the posterior bending down in the form of a 

 hook : he omits also the dark tips of the ears, and the 

 streaks on their inside. So far the presumption that the 



