130 Recently published Ornitholoyical Works. 



Altogether Mr. Butler includes 209 species in the Avifauna 

 of these islands, and adds many excellent field-notes. A 

 coloured figure is given of Astur butleri Gurney (Bull. 

 B. O. C. vii. p. xxvii), which is ''not uncommon in the 

 forests of Car Nicobar/' 



Mr. Butler should have added to his paper a list of the 

 species peculiar to the Andamans and Nicobars, and pointed 

 out their nearest allies on the continent. This would have 

 helped us to find out how these islands became stocked with 

 bird-life. Geographically they are an extension of the ridge 

 of Sumatra, and probably their zoological alliances are in the 

 same direction, although this does not seem to have been 

 Mr. Hume's opinion. 



6. Biittikofer on the Birds of Central Borneo. 



[Zoological Results of the Dutch Scientific Expedition to Central 

 Borneo. — Birds. By Dr. J. Biittikofer. Notes Leyden Mus. xxi. p. 145.] 



Dr. Biittikofer has already given an interesting general 

 account of his expedition to Central Borneo in his preface to 

 Dr. Jentink's essay on the Mammals procured for the Leyden 

 Museum on that occasion. The report on the Birds of the 

 expedition, now before us, has been delayed by the circum- 

 stances of the author's appointment to the Directorship of the 

 Zoological Garden of Rotterdam. 



In the present memoir Dr. Biittikofer adds to the list 

 of the birds obtained by himself and his companions during 

 the Central Bornean Expedition an account of a small 

 collection made at Pontianak near the west coast by 

 Mr. Moret, one of his assistants, after his return, and 

 of others made by Dr. A. W. Nieuwenhuis and by 

 Mr. Westenenk, some of which were from Eastern Borneo ; 

 and thus he reports altogether upon specimens referable to 

 269 species. A comparison of the Western and Eastern 

 collections shows that, so far as the lowlands are concerned, 

 the Avifauna of this part of the island is nearly homogeneous. 

 Contrary to Dr. Biittikofer's expectations, as he was 

 exploring a district ornithologically unknown, and as he 

 paid special attention to the more obscure and local forms, 



