Ibycter 8 



Ictinactus 69 



Ictinia 104 



Kaupifalco 87 



Leptodon 100 



Leucopternis 58 



Lophoaetus 74 



Lophogyps 6 



Lophotiiorcliis 69 



Loptoictinia 99 



Machaerhamphus 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 



Polybonis 7 



Pseudogryphus 3 



*Pseiidogyps vice Gym- 



nogyps 5 



Regerhinus 100 



Rostrhamus 99 



Rupornis 55 



*Sagittarius 4 



Sarcorhamphusf 1 



Serpentarius 3 



Spilornis 79 



Spizaetiis 70 



Spiziapteryx 119 



Spiziastur 70 



T achy trior chis 52 



Terathopius 89 



Thalassoaetus 91 



Thrasaetus 62 



Tinnnnculus 144 



Torgos 6 



Uroaetus 63 



Urotriorchis 17 



Urubitinga 57 



Viiltur 4 



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

 if the rules are strictly adhered to, Vul'.itr Linn, must replace Sarcorlianiphus, 

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

 Old World (or true) Vultures be called Ms;ypidce. 



VI. 



