164 BIRDS FROM MAS. 



Nias, the ornis of this large island is certainly far from 

 exhausted , and interesting results may be expected from 

 further investigations still. But this number of species is 

 sufficient to show the close relationship of the avifauna of 

 Nias to that of Sumatra, there being only eleven Nias 

 species which have not been found anywhere else as yet. 

 Amongst these species there are none, however, which 

 offer very prominent characteristicals , and nearly all must 

 be considered as the representatives of very closely allied 

 Sumatran forms. In a few cases only we meet with the 

 peculiar fact that the affinities to Javan and Bornean 

 forms are greater than to those from Sumatra, as is shown, 

 for instance, in Chrysophlegma niasense and Burnesia super- 

 ciliaris. 



*1. Gerchneis tinnunculus (L.). 



An immature male (N^'. 19) from Hili Madjeio, Nov. 18th. 

 »Iris dark blue, bill bluish black, cere, base of lower 

 mandible and feet yellow. Native name: Nah-oero.'" 



2. Astur trivirgatus (Temm.). 



Falco trivirgatus Nieuwenh. & Rosenb. Versl. Eil. Nias, p. 19 (1863). 

 Astur trivirgatus Rosenb. Mai. Arch. p. 219 (1878); Oust. Bull. Soc. 



Philom. Paris (8) IV, pp. 108, 119 (1892). 

 Lophospizias trivirgatus Salvad. Ucc. di Nias, p. 525. 



An adult male (N^. 201) from Goenoeng Sitoli , January 

 11th, and an adult female (N°. 238) from Lahagoe, Fe- 

 bruary 15th. 



»Iris yellow, bill bluish black, lower mandible paler, 

 cere and angle of mouth yellow, feet yellow. Native name : 

 Fo-o-toh." 



*3. Astur poliopsis (Hume). 



An adult female (N". 28) from Hili Madjeio, Nov. 20th. 

 »Iris yellow, bill bluish black, cere yellow, feet yellow. 

 Native name: Nah-oero fo-o-toh.'^ 



Notes from the Leyden INIuseum, Vol. XVIII. 



