402 JOURNAL, BOMBAY NATURAL HISTORY SOCIETY, Vol. XL 



Mihus, but of the same quivering, plaintive character and of about the 

 same pitch, perhaps rather higher. In the same place I saw con- 

 tinually for some four or five days a flock of five birds ; these generally 

 flew a good deal higher and sailed more round and round rather than 

 flapped about. They were very wild. It was with difficulty I at last 

 obtained one shot and succeeded in killing a fine male. 



(533) Falco perigkinus. — The Perigrine Falcon. 

 Hume, No. 8 ; Blanford, No. 1254. 



A few birds of this species are to be met with every cold weather, 

 but it is never really common. I have one magnificent female with a 

 wing measuring 14'75", one of the largest birds I have seen. 



(534) Falco perigrinator. — The Shahin Falcon. 

 Hume, Nos. 9 and 9 bis ; /Stanford, No. 1255. 



About as often seen as the previous Perigrine. These two falcons are 

 exceedingly hard to discriminate. I have now before me two birds, 

 one the fine Perigrine already alluded to and the other a very small 

 female F. perigrinator with a wing of only 12'25". The lower plumage 

 of these two birds is almost identical, though the rufous central blotches 

 to the feathers may be rather smaller in the Shahin than in the Perigrine. 

 The latter has eleven bars on the tail and the former twelve. Above the 

 only difference I can note is the decidedly darker crown in the Shahin. 

 Both birds are in the young brown plumage. The most notable difference 

 in the birds is not one of plumage at all but consists in the smallness of 

 the Shahin's feet when compared with those of the other bird, not so 

 much that they are shorter as that they are thinner and weaker. This 

 feature is almost equally remarkable in an adult male F. perigrinator a 

 very typical bird, except for the fact that its under -plumage is almost 

 pure white. I do not consider the differences in these two birds to be 

 of more than sub-specific value, but I have so small a series to work on 

 that I cannot advance this theory with much confidence, and the 

 sub-specific relationship would have to be substantiated by a number of 

 intermediate forms being obtained. 



(535) Falco jugger.— The Laggar Falcon. 

 Hume, No. 11 ; Blanford, No. 1257. 



This Falcon has been reported from Cachar by Inglis and others, but 

 it must be a very rare bird, as I have never seen one, nor have any of 

 my collectors managed to get me one. 



