286 Letters, Extracts, and Notes. 



leading feature in the Falklandian Avifauna, and good notes 

 are given upon the four species of this family that are found 

 in the group. Views, from photographs, of the " rookeries " 

 of the Rock-hopper and Gentoo are added, but there is no 

 map of the islands to shew their exact localities. Nor is 

 the list of books and papers on the natural history of the 

 Falklands by any means complete. 



XXIII. — Letters, Extracts, and Notes. 



We have received the following letters addressed to " The 

 Editors of < The Ibis ' " :— 



Sirs, — I wish to point out that Ortholophus finscki of 

 Dr. Sharpe (' Ibis/ 1904, p. 610) is simply a synonym of 

 Buceros albocristatus Cassin, of Liberia. If Dr. Sharpe had 

 read my review carefully * he would hardly have written 

 (/. 6'.) : "I do not think that Dr. Finsch can have seen 

 Cassin's plate and description in the ' Transactions of the 

 Philadelphia Academy' (vol. i. p. 135, pi. 15)." In the 

 carefully-compared synonymy of my paper on Ortholophus I 

 have referred to all of Cassin's publications respecting this 

 species, and especially to the description and plate xv., which 

 appeared not in the i Transactions ' but in the ' Journal ' of 

 the Academy of Nat. Sci. Philad. (vol. i. 2nd ser., 1847-50, 

 part ii., August 1848, p. 135, pi. xv.). This plate repre- 

 sents undoubtedly a specimen from Liberia (St. Paul's 

 River : MacDowell), as is proved by the series in the Leiden 

 Museum from Liberia (Buttikofer <Sf Sala) and Sierra Leone 

 [Demery). I do not know for what reason Reichenow 

 should doubt the origin of Cassin's type-specimen (" Fundort 

 St. Paulsfluss irrthumlich," Vog. Afr. ii. p. 267, note) and 

 refer O. albocristatus of Cassin to specimens from Lower 

 Guinea — an erroneous view in which Dr. Sharpe has fol- 

 lowed him. Of course, Cassin himself had wrongly identified 

 specimens from the Gaboon with the form from Liberia, but 



* " Ueber die Arteii der Bucerotiden Gattung Ortholophus, Grant," in 

 Notes from the Leyden Museum, vol. xxiii. (May 1903) p. 195. 



