Recently ptihlished Ornithological Woilcs. 341 
50. Finsch's Lists of the Birds of the Leyden Museum. 
[Zur Catalog-isirung der ornithologischen Abtheilung von J3r. 0. Finsch. 
VI.-IX; Notes Leyden Mus. xxiii. pp. 1, 33, 58, 97.1 
Dr. Finsch proceeds with his catalogue of the birds in the 
Leyden Museum (see Ibis, 1891, p. 725) and his remarks 
thereupon, and now treats of the Meropidse, Muscicapidse, 
Certhiidse, and Cuculi. A new species, Cyornis hosii, is 
described from Borneo, and a complete revision of this 
difficult genus is igiven. The supposed Cuculus canoroides 
of the Malay Archipelago is re-united to the Europeau 
C. canorus. Various other notes and comments on the 
birds of these groups are given. 
51. Hacker on the Song of Birds. 
[Der Gesang der Vogel, seine anatomisclien mid biologisclieu Giuud- 
lagen. Von Dr. Valentin Hacker. 8vo. Jena, 1900. Pp. 6, 102. 
G. Fischer. Price 3s. 6d.'] 
This interesting little volume, abundantly and clearly 
illustrated, gives in the first place an account of the anatomy 
of the bird^s syrinx. There is naturally not a great deal of 
novelty in this part, excepting, indeed, that the syringes are 
often exhibited in longitudinal section, thus emphasizing the 
different thickness of the tracheal and bronchial rings which 
constitute the organ. The latter part of the volume deals 
exclusively with the phenomena of song in birds. 
52. Hall on the Species of Gymnorhina. 
[A Revision of the Genus Gj/mnorhina. By Robert Hall. Proc. Roy. 
Soc. Victoria, xiv. pp. 1-9.] 
Mr. Hall shews that many intermediate forms exist 
between the white-backed G. leuconota and the black-backed 
G. tibicen, upon some of which the supposed species 
G. hyperleuca and G. dorsalis have been founded. He 
proposes to reduce thtm all to one species, and to call it 
G. leuconota. But if this is done the name ^'tibicen''' of 
Xjatham has the priority and should be employed. As a 
general rule, however, the white-backed and the blacK-backed 
birds are readily distinguishable. 
