Mammals from the Malay Peninsula and Islands. 301 



Northern Nigeria : Akwatcha, Bassa Province, JuDe 1903 

 (Dr. G. J. Pirie). 



Although on a cursory inspection Hamatopota tenuicrus 

 might possibly be mistaken for a pale form of H. lacesscu.<, 

 Austen, which also occurs in Northern Nigeria, it is, apart 

 from other characters, easily distinguishable owing to the 

 non-incrassate front tibiae ; the fact that the thoracic stripes 

 remain parallel instead of, as is usually the case, converging 

 posteriorly will also serve as a means of distinguishing the 

 present species. 



XXXIII. — On Mammals from the Malay Peninsula and 

 Islands. By Oldfield Thomas. 



The British Museum owes to Mr. Herbert C. Robinson, of 

 Selangor, a further fine collection of Malayan mammals, 

 mostly collected by him during an exploration of the h 

 ground separating- the States of Selangor and Pahang. 

 During their determination I have made the following notes, 

 both on them and on other Malayan mammals in the Museum 

 collection. 



Symphalangia syndactylies coniinentis, subsp. n. 



While the Siamang is common in Sumatra, it is rare on the 

 Malay Peninsula, and but few specimens have ever been sent 

 home for examination. One was received from Mr. Robinson 

 in 1906 and is referred to in Mr. Bonhote's account of the 

 Mammals of the Gunong Tahan Expedition *, and now 

 another comes from the Semangko Pass, Selangor-Pahang 

 Boundary. Both are fine old males, and have afforded me 

 a good opportunity of comparing the Malay form with that 

 found in the Island of Sumatra. The result is that the 

 Malay form proves to be slightly different from the Sumatran 

 one, and may be diagnosed as follows : — 



External characters quite as in true syndactylies, except 

 that the size, in agreement with the skulls, will no doubt 

 prove to be rather less. 



Skull smaller and more lightly built than in syndactylies. 

 Face lower, the orbits smaller and rather less heavily ridged. 

 ^luzzle markedly less projecting when viewed from above. 

 Nasal opening decidedly narrower. Tooth-row shorter. 

 Mandible slenderer, its height below the molars less than in 

 syndactylus. 



* Journ. Fed. Mai. States Mas. iii. p. 1 (1903). 



