BESULTS FROM THE MAMMAL SURVEY. 653 



Since the above was written Mr. R. I. Pocock has informed me 

 that in some skulls in his possession he has found a similar forma- 

 tion of the teeth (but on one side of the jaw only) in skulls of 

 Canis naria and Canis Iwpaster, the former shot by Major Rodon 

 at Dharwar, and the latter from Africa. He tells me that he has 

 also found it in the Greyhound. This does not of course affect in 

 any way the validity of lanha as a good species, but in any specu- 

 lation as to whether this peculiar tooth formation is (1) a Survival, 

 (2) a Revival or (3) a New departure, Mr. Pocock's facts cannot 

 but be of very considerable interest . 



(jP) The Langurs of Assam. 



By R. C. Wkoughton. 



When describing the Freshytis shorfridgei of the Upper Chindwin, 

 Journ. B. N. H. S., Vol. XXIV, p. 56, I found a considerable 

 amount of confusion existing as to the nomenclature of the Langurs 

 of Assam and determined to return to them when leisure allowed. 

 On laying out the material available in the National Collection I 

 find that there are two quite distinct species representing Lower and 

 Upper Assam respectively. Blanford records lAleatus Blyth as the 

 name of the Assam Langur, and his description is sufficiently wide 

 to cover both the species I have mentioned above, but on referring 

 to Blyth's original description it seems that the author of the name, 

 who states that his specimen type was half grown, was under the 

 idea that his specimen was Malayan and describes it as of the 

 ohsctirus type. However the recent transfer of the generic name 

 Pithecus to the Langurs makes 'pileatus invalid in that genus, as the 

 name Pithecus pileatus had already been used for a macacque. 

 There remains the name cJvrysog aster stated by its author to have 

 come from Tenasserim, but which Blanford hints probably came 

 from Cachar (Mammalia, p. 38, footnote). Here again however 

 the matter is of no moment for when the name was first published 

 by Peters it was so as synonymous with i^otenziani, a totally distinct 

 animal. It would appear therefore that there is no existing valid 

 name for these Assam Langurs, with which, for convenience, I 

 associate shoriridgei, as being closely related, although living just 

 beyond the actual boundary of Assam. The three species may be 

 arranged in a key as follows : — 



Key. 



General colour cinereus. 



A. Whiskers only slightly paler than the general 

 body colour ; under surface like general 

 colour (Upper Chindwin River)... ... sliortridgeifWv. 



