448 Mr. J. H. Gurney's Notes on 



de la iiuque avec de bords roussatres peu distincts, .... 

 La jeune femelle . . . plumes du dessus avec des bords clairs 

 plus prononces." 



At the same time, this point will be one of but little con- 

 sequence if Mr. Sharpe is correct in treating ^' Falco polya- 

 grus " of Cassin as merely a synonym of '' Falco mexicanus " 

 of Lichtenstein. My impression is that this is the correct view, 

 as the American Falcons of the genus Gennaia which have 

 come under my own observation have all appeared to me to 

 be referable to one and the same species. I annex a few 

 memoranda descriptive of those which I have most recently 

 examined. 



(A) Norwich Museum ^. 

 Milk river, July 18. 



This is a very young bird, the primaries being not yet 

 fully grown. It is remarkable for the strong luteous tint 

 which entirely pervades the otherwise white under surface of 

 the body, except the lower flanks, w^here the feathers are 

 blackish-brown narrowly edged with fulvous, and excepting 

 also the space occupied on the breast and abdomen by nume- 

 rous dark-brown longitudinal shaft-marks, which are largely 

 developed both as to length and breadth ; the cheeks, eye- 

 brows, and throat are of a buffy white, resembling the ground- 

 colour of the breast ; the feathers of the upper part of the 

 head are black along the shaft with rufous-brown edges, 

 the rufous tint being especially apparent on the nape ; the 

 feathers of the mantle are dark brown edged with rufous, the 

 latter colour being paler on the edges of the quill -feathers of 

 of the wing and on the upper tail-coverts ; all the rectrices 

 are largely tipped with buffy white, the central pair being 

 narrowly edged on the sides with white^ but other^nse a 

 somewhat pale uniform brown ; the other rectrices are all 

 distinctly barred with rufous on the inner webs. 



(B) Norwich Museum. 

 Wyoming, August 17 (marked $ ). 



* For this and three other specimens of this Falcon the Norwicli 

 Museum is indebted to the authorities of the Smithsonian Institution. 



