212 Letters, Notes, Extracts, Sfc. 



the author observes, has been probably based on an individual 

 variety. The plate annexed represents the typical form of 

 Stringops and various details. 



Part 4 (price 2s. lid.), also by Count Salvadori, contains 

 the Nestoridae of New Zealand, consisting of the single genus 

 Nestor. The author recognises six species of this curious 

 form. The plate represents Nestor septentrionalis and details 

 of other species. 



Part 5 (price 6s.), also by Count Salvadori, relates to the 

 Cacatuidce, which are divided into two subfamilies— Cacatuinae 

 and Calopsittacinae. In the first of these the author recog- 

 nises five genera with 26 species altogether. The second 

 subfamily contains only one species, Calopsittacus nova- 

 hollandia. 



Two excellent coloured plates represent Cacatua goffini, 

 Calopsittacus nova-hollandia , and various details. 



XII. — Letters, Notes, Extracts, &;c. 



We have received the following letters addressed to " The 

 Editors of 'The Ibis'":— 



Sirs, — It may interest the readers of ' The Ibis ' to learn 

 that I have lately had the opportunity of examining a speci- 

 men of the rare Albatros described by Salvin in 1896 as 

 Thalassogeron linjardi (Cat. B. xxv. p. 450), of which, so far 

 as I am aware, but one example is yet known. The speci- 

 men in question was obtained by the late Mr. J. O. Marais 

 off the Knysna Heads, on the eastern coast of the Colony, 

 on the 28th of August, 1899, and was acquired, with other 

 birds collected by the same gentleman, by the Pretoria 

 Museum. Dr. Gunning, at my request, has kindly allowed 

 me to examine it, and I find it to agree well with the 

 description and measurements of the type in the British 

 Museum as given by Salvin. 



If the genus Thalassogeron is to be maintained (of which 

 Mr. Rothschild has lately expressed some doubt — see Bull. 



