Letters, Extracts, Notices, 5ff. 135 



Wliitely in British Guiana, aud entered in Mr. Salvin's list 

 of Mr. Wliitely^'s collection as being probably referable to 

 Buteo unicolor. 



M. Oustalet speaks of D'Orbigny's type as being *' beau- 

 coup moius iioir^' than one of the Guiana specimens sent to 

 him for comparison ; and I cannot but suspect that these two 

 examples, which have been presented by Messrs. Salvin and 

 Godman to the British Museum, ai'e specifically distinct from 

 Buteo unicolor, and that the latter is identical with the 

 melanistic phase of Buteo sivainsoni. 



Yours &c., 



J. H. GURNEY. 



Duuipace, L.arbert, N.B., 

 October 29, 1888. 



Sir, — Allow me to correct a misprint in the last number 

 of ' The Ibis.' At page 492, for Dr. John Mackney," read 

 Dr. John Mac-Buiy. 



I may take this opportunity of recording the occurrence 

 of an adult male Blue-throated Warbler [Cyanecula suecica) 

 on the Monarch-Islands lighthouse. It was sent me by 

 Mr. Joseph Agnew, and is now here in spirits. It may also 

 interest naturalists to know that Rockall was landed upon 

 last summer, and that, amongst other eggs, of which several 

 dozens were taken, one egg of a Common Guillemot is recog- 

 nized by Mr. T. E, Buckley, to whom it was forwarded. 



Yours &c., 



J. A. Harvie-Bhown. 



Herring-fleet Hall, 



near Lowestoft, Suffolk. 



November 1, 18«8. 



Sir, — I have recently had an opportunity of examining the 

 beautiful collection of Falcons' skins in the Norwich Mu- 

 seum with Mr. John Henry Gurney, and, after carefully 

 looking over the fine series of specimens of Fa/co habi/hnicus, 

 have no hesitation in deciding that all of the birds I shot in 

 Sind belonged to that species, and not to F. burburus, as 



