Ibycter 8 



Ictinaetus 69 



Ictinia 104 



Kaupifalco 87 



Leptodon 100 



Leucopternis 58 



Lophoaetus 74 



Lophogyps 6 



Lophotriorchis 69 



Loptoictinia 99 



Machserhamphus Ill 



Megatriorchis 39 



Melierax 18 



Micrastur 15 



Microhierax 115 



Milvago 9 



Milvus 96 



Morphnus 61 



Nauclerus 95 



Necrosyrtes 7 



Neophron 6 



Nisaetus 67 



Nisoides 29 



Otogyps 6 



Pandion 162 



Parabuteo 17 



Pernis 112 



Pithecophaga 78 



Polioaetus 164 



Poliohierax 118 



Polyboroides 10 



Polyborus 7 



Pseudogryphus 3 



*Pseudogyps vice Gym- 



nogyps 5 



Regerhinus 100 



Rostrhamus 99 



Rupornis 55 



*Sagittarius 4 



Sarcorhamphusf 1 



Serpentarkis 3 



Spilornis 79 



Spizaetus 70 



Spiziapteryx 119 



Spiziastur 70 



Tachytriorchis 52 



Terathopius 89 



Thalassoaetus 91 



Thrasaetus 62 



Tinnunculus 144 



Torgos 6 



Uroaetus 63 



Urotriorchis 17 



Urubitinga 57 



Vultur 4 



t Mr. Sclater (Ibis, 1919, p. 777, Aiik, 1920,. p. 154) points out that, 

 if the rules are strictly adhered to, Vultur Linn, must replace Sarcorhamphns, 

 while the logical result is that Vidturidce must replace Cathartidce and the 

 Old World (or true) Vultures be called Mgypidce. 



VI. 



