.370 Lord Wuldcu on, a iiiw Species o/' Tiichostoina. 



particulars will be found in the article on this species (there 

 styled Archibuteo lagopus, var. sancti-johannis) in the third 

 volume of the ' History of North- American Birds/ by Messrs. 

 Baird, Brewer, and Ridgway. 



The iris in this species appears to be liable to variations of 

 colour similar to those which occur in the case of A. lac/opus. 



There remains but one otlier species of the genus Archi- 

 buteo, the beautiful A.ferruyineus of Western North America — 

 a species which, as it seems to me, is most obviously and un- 

 questionably distinct, but which, nevertheless, has been unac- 

 countably held by so high an authority as Professor Schlegel 

 to be merely " quelque sort de leucoi'sme, on, si I'on veut, 

 d'erythrisme " of A. lagopus^. 



This fine and well-marked species has been fully described 

 by Mr. Sharpe, and also in the exhaustive w^ork of Messrs. 

 Baird, Brewer, and Ridgway. The latter authors give a 

 table of measurements taken from six males and six females 

 of this species, none of which, however, appear to equal the 

 principal dimensions of the adult described by Mr. Sharpe. 



The colour of the iris in this Buzzard seems to be as vari- 

 able as in A. lagopus and A. sancti-johannis : Mr. Sharpe 

 describes it as " brown " in the adult ; whilst the authors of 

 the American work above referred to mention an adult male 

 in which it was a " clear light yellow," and an adult female 

 in which it was a " light ochraceous brown." 

 [To be continuerl.] 



XXXV. — Description of a new Species of the Genus Tri- 

 chostoma from the Island of Celebes. By Arthur, Vis- 

 count Walden. 



(Plate XI.) 



In Jardine's '^Contributions to Ornithology' (1849, pp. 127, 

 128, t.) the late Mr. Strickland gave a short account, 

 accompanied by a figure, of a Celebean bird on which he 

 bestowed the title of Trichastoma celebense. On the prece- 



* Vide Mu8. des 'Pays-r>as. "Revue de la collecli<-n des Oiseaiix de Proie, 

 p. 105. 



