514 



On the Langurs inhabiting Ceylon, 

 Skull-measurements (in millimetres) . 



Pithecus 



vetulus vetulus. 



6. 



Condylo-basilar leng'tli 

 Occipito-lDasilar length. ' 

 Zygomatic breadth . . 

 Cranial length (orbit to 



occiput) 



Cranial width 



Postorbital constriction 

 Greatest width across 



orbits 



Condyle to wi' 



Palatilar length. ..... 



Canine to m'' 



711^-71%^ 



72-8 

 93-6 

 74-0 



76-5 

 58-2 

 44-3 



61 



39-1 



32-6 



34-3 



19-1 



64-7 

 84-5 

 69'o 



70-5 

 55 4 

 41 



54-9 



35-7 



28 



31-1 



18-1 





V. phillipsi. 



96-1 

 71-4 



75-5 



•56 



43 



61 



33-7 

 35-5 



19-9 



60. 

 Type. 



63. 



73-3 

 931 

 751 



71 



41 



60-2 

 42 

 38-4 

 33-1 



18-5 



74-7 



91 



72-2 



69-5 



58 



41 



58-9 



42 



31-7 



33-5 



19 



^. -x) 



82-2 

 102 

 81-4 



80-7 

 63-6 

 42-3 



64-2 

 47-3 

 35-5 

 36-1 

 19-8 



CH- 



80 

 101 



77 



55-3 



41-9 



62-9 

 43-4 

 345 

 36-5 

 20-3 



P.S., Feb. 1, 1923 :— 



Since drawing up the foregoing j^^P^^' I have found two 

 important letters from Mr. Phillips to me, dated Decembers, 

 1921, and January 11, 1922, which by inadvertence I had 

 overlooked and forgotten. In the earlier letter Mr. Phillips 

 says : — " While examining the Pithecus monkeys in the 

 Colombo Museum the other day I found that the P. hepha- 

 lopterus oi this district [Matugama] is apparently different 

 from that of the Panadura district nearer to Colombo. 

 The form from down here [i. e., P. v. vetulus of this paper], 

 and from the Udugama Hills, is very dark, almost black, 

 with a very ^veil-marked grey sacral region ; while that from 

 nearer Colombo is dark brown, sacral region not nearly so 

 well marked, and, in fact, it seems almost intermediate 

 between the Kalutara form of P. kephalopterus and the 



P. ursinus of up-country The boundary between 



the ranges of the two forms seems to be the Kala Ganga 

 River, which flows into the sea at Kalutara. I am having 

 a series of about a dozen fresh skins of each form collected, 

 which I hope to be able to submit to you before long.-'^ 



In the second letter Mr. Phillips says : — " Personally I 

 am quite satisfied that the two forms are distinct — inhabiting 

 different areas. No. 1 [P. v. vetulus'], which I regard as the 

 typical P. kephalopterus^ ranges from about Ranna (S.Ceylon), 

 through the Udugama Hills, in the Galla district, and up 



the western coast to the Kala Ganoa River 



. and it is 



