344 Mr. H. Seebolim on the 



a varying number of tracheal rings are incomplete in front 

 as Avell as behind, instead of being complete anteriorly, as in 

 Strix, makes it appear as if the attachment of the said muscles 

 had moved further down the bronchi. Of the above-men- 

 tioned types Asio is furthest removed from Strix; there are 

 seven tracheal rings intervening between the last complete 

 one and the first bronchial which bears the muscles. 



This modification of the syrinx culminates in Scops leucotis 

 (fig. 7, p. 343), where the syringeal muscles are attached 

 to the tenth semiring. 



There is thus a gradual series (which would probably be 

 more complete could I report upon a larger collection of 

 syringes) leading from Strix to Scops. 



As the series is gradual, it is impossible to make a break 

 anywhere, although the extremes, viz. Scops and Strix {cf. 

 figs. 5 & 7), are different enough. 



In view of the object of the present paper (that is, of 

 establishing the justice of dividing the Striges into two 

 groups), I may point out that the structure of the syrinx, 

 although it would not be sutficicnt, if considered by itself, to 

 justify such a classification, is by no means contradictory to it. 



XXXV. — On the Birds observed by Dr. Bunge on his recent 

 Visit to Great Liukoff Island. By Henry Seebohm. 



For a period of five years, from 1882 to 1887, many in- 

 teresting observations were made by Dr. Bunge in North- 

 east Siberia. The results of his visit to the delta of the Lena 

 were published in the ' Melanges Biologiqucs tires du Bulletin 

 de F Academic Imperiale dcs Sciences de St. Petersbourg," xii. 

 livr. i. pp. 31-107, of which a resume may be found in the 

 ' Transactions of the Norfolk and Norwich Naturalists^ 

 Society,' iv. pp. 301-305. The record of Dr. Bungc's 

 observations in Great Liakoff Island is to be found in the 

 ' Beitrage zur Kenntniss des Russischen Reiches und der 

 angrenzenden Lander Asiens,' iii. pp. 231-283. 



Dr. Bunijc crossed the ice from the mainland to (ircat 



