22 NYCTICEBUS 



is called to N. ceylonicus Geoff., as a possible variety of N. 



JAVANICUS. 



1881. Anderson, Catalogue of Mammalia in the Indian Museum, Cal- 

 cutta. 



The form from the Malayan Peninsula described as Nycticebus 

 tardigradus malaianus. 



1888- Blanford, The Fauna of British India including Ceylon and 

 91. Burma. 



The form from Tenasserim is figured and described on the 

 authority of Tickell Nycticebus tardigradus, Tenasserim variety. 



1902. Stone and Rehn, in Proceedings of the Academy of Natural 

 Sciences of Philadelphia. 



Nycticebus (coucang) hilleri from Sumatra, and Nycticebus 

 (coucang) natunce from Bungaran, Natuna Islands, first de- 

 scribed and a revision of the genus Nycticebus given. 



1906. M. W. Lyon, in Proceedings of the National Museum, Wash- 

 ington. 



Nycticebus borneanus from Western Borneo, and Nyctice- 

 bus bancanus from the Island of Banka, first described. 



1907. Bonhote, in Proceedings of the Zoological Society of Lon- 

 don. 



Nycticebus pygm^eus first described. 



GEOGRAPHICAL DISTRIBUTION OF THE SPECIES. 



This small group of night-loving animals is essentially one of the 

 Oriental Region, ranging in India, Arakan, Assam, Siam, Annam, 

 Tenasserim, Malay Peninsula, Sumatra, Banka, Java and Borneo, the 

 Natuna Group and the Philippines. The N. coucang ranges to the 

 east of the Bay of Bengal, Burma and possibly Assam, but it is 

 practically impossible to define its boundaries as it has been so con- 

 fused with N. c. cinereus, and it may eventually be ascertained, that, 

 these species now considered distinct, are not so in reality. The 

 dispersal of N. c. cinereus, which is smaller than N. coucang, 

 is supposed to be in Siam and Cochin China, but it cannot 

 be said that these boundaries are accurately defined, nor can 

 they be, until, through the acquisition of ample material, the exact 

 status of the two forms is determined. In Annam, N. pygm^eus was 

 discovered and in Tenasserim N. tenasserimensis occurs, its range 

 unknown, while N. malaianus is found in the Malay Peninsula and on 

 the west coast of Sumatra. In this Island also N. hilleri has been 



