1900.] ON MAMMALS FROM S.W. ARABIA. 95 



The length of the cephalothorax is 15 mm. 



The colour in spirit is dark brown. 



P. dehaani has been found in Japan and the Loo Choo Islands ; 

 P. obtusipes in the Loo Choo Islands and the Philippines. 



P. bicristatum de Man, 1899, is an allied species from Borneo 

 (Mount Liang Koeboeng). In view of the peculiarities of the 

 distribution of the genus, it seems best to choose a territorial name 

 for the new species. That of kadamaianum is therefore proposed, 

 derived from the name of the river in which the present specimen 

 was found. 



1 § ; Kadamaian River, Kina Balu, 2100 feet. 



2. On the Mammals obtained in South-western Arabia by- 

 Messrs. Percival and Dodson. By Oldfield Thomas^ 

 F.Z.S. 



[Received December 19, 1899.] 



On the initiative of Mr. Ogilvie Grant, and by the active 

 assistance of General Creagh, Governor of Aden, an expedition was 

 arranged during the past autumn to South-western Arabia for the 

 purpose of obtaining zoological specimens for the British Museum. 

 The expedition consisted of Mr. A. B. Percival and Mr. W. Dodson, 

 the latter having especial charge of the mammal-collecting. 



Mr. Dodson had already had some experience as a collector of 

 small mammals during a trip to Boumania in the spring, and he 

 had shown such keenness and aptitude for the work that he would 

 evidently have become an exceptionally able collector, but most 

 unfortunately he contracted fever at El Khaur, and having been 

 brought back to Aden by Mr. Percival, died there on the 20th of 

 October. 



The present collection, in the formation of which Mr. Dodson 

 took, to the last, the most vivid interest, is naturally very similar 

 in character to that obtained by Col. Yerbury in the same 

 region in the spring of 1895, of which an account was given 

 by its collector and myself in the Society's ' Proceedings ' for 

 that year l . Further examples of the interesting Gerbilles dis- 

 covered by Col. Yerbury were obtained and valuable series of 

 various other forms. 



The following species are additional to those recorded in the 

 previous list : — Papio arabieus, Cants pallipes, Vulpes leucopus, 

 Mellivora ratel, Gerbillus gerbillug, Proeavia syriaca jayakari. 



The animal that proves to be of greatest interest is the 

 Baboon, of which one specimen, unfortunately a female, but fully 

 adult and in good condition, was obtained. This specimen is so 

 different from the African Papio hamadryas as to require specific 

 distinction. 



The collection was made mainly in two districts — the one at and 

 around Lahej, Col. Yerbury's chief collecting-ground, and the 



1 P. Z. S. 1895, p. 542. 



