THE BIRDS OF THE NATUNA ISLANDS 11 



of islands in the Natunas that comparisons are probably best made 

 with the Natuna Archipelago as a whole. 



Of the resident forms, the following 26 are, so far as known, pecul- 

 iar to the Natuna Islands: 



Muscadivores aeneus diatropurus. 

 Dendrophassa vernans pellochlora, 

 Hydrocissa convexa zamelaena. 

 Phodilus badius arixuthus. 

 Meiglyptes tukki azaleus. 

 Artamus leucoryn. macroterus. 

 Philentoma pyrrhoptera dubia. 

 Hypothymis azurea gigantoptera. 

 Alcippornis brunneicauda epipolia. 

 Cyanoderma erythroptera neocara. 

 Mixornis rubicapilla evereiti. 

 Mixornis rubicapilla zaperissa. 

 Stachyris nigriceps naiunensis. 



Alcippe cinerea bungurensis. 

 Pycnonotus simplex axanthizus. 

 Kittacincla malabarica eumesa. 

 Orthotomus sericeus rubicundulus. 

 Dissemuriis paradiseus endomychus. 

 Graucalus sumatrensis bungurensis. 

 Arachnothera longiroslra atita. 

 Arachnothera longiroslra rothschildi. 

 Anthrepies simplex euthapsinus. 

 Anthreptes malacensis erixanthus. 

 Cinnyris ornala zapega. 

 Cinnyris brasiliana axanlha. 

 Dicaeum trigonostigmum megastomum. 



Aerodramus vestitus amechanus 

 Aegithina viridissima thapsina. 

 I ale olivacea crypta. 



Of these,^ 12 have their nearest relatives in Borneo, 11 in the Malay 

 Peninsula, 9 in Sumatra, 4 in the Anamba Islands, 2 in Java, and 

 none in Indo-China. 



Furthermore, the following six Natuna subspecies have been found 

 elsewhere on only the Anamba Islands in the South China Sea, 

 although, of course, their nearest relatives occur on the large islands 

 or the adjacent mainland: 



Orthotomus atrogularis major. 

 Lamprocorax panayensis heterochlorus. 

 Aethopyga siparaja ochropyrrha. 



The 76 remaining birds of the Natuna Islands belong to species 

 some of which are confined to a limited East Indian area, while 

 others have a wdde range in the Oriental and Australasian regions. 

 Of these Natuna species and subspecies, 22 occur in the Anamba 

 Islands, 70 on Borneo, 59 on Sumatra, 58 in the Malay Peninsula, 

 34 on Java, and 15 in Indo-China. 



From these comparisons it will be evident that the Natuna Islands, 

 in so far at least as our present knowledge of their ornithology extends, 

 are faunally most nearly related to Borneo; somewhat less so, and 

 about equally, to the Malay Peninsula and Sumatra; about half as 

 much to Java as to Sumatra; still less so to the Anamba Islands; 

 and least of all to Indo-China. 



Table 1 presents in more graphic form the data elaborated in the 

 preceding paragraphs. In this the first column is reserved for endemic 

 Natuna forms; in the other columns the occurrence of the Natuna 

 birds themselves is indicated by an asterisk (*); and of their nearest 

 relatives by a dagger (f). 



' In these comparisons it is obvious that the nearest relatives of certain forms occur in more than one of 

 the areas mentioned. 



66786—32 2 



