Distribution of Birds. 523 



hunting-grounds to tlie Ornithologists of Central Europe. 

 But, with the exception of the 'Aves de Espana' of Don 

 Jose Arevalo y Baca (17) and Brusina\s papers on the Birds 

 of Croatia (18), we have few, if any, recent native works on 

 the Ornithology of these countries to speak of. 



2. The Cisatlantean Suhregion. 

 The birds of the Cisatlantean Suhregion were mostly in- 

 clr.ded by Mr. Dresser in his great woi-k, and are therefore 

 tolerably well known and correctly figured. The peculiarity 

 of the Cisatlantean Ornis consists in the repre-sentation of 

 many familiar species of European birds by more or less 

 nu)dified specific forms. As regards the continental portion 

 of this suhregion no general work has appeared of late years, 

 although memoirs in various journals, amongst which we may 

 specify Dr. A. Koenig's excellent article on the Ornithology 

 of Tunis (19), have materially increased our knowh'dge of 

 this subject. There is also ample room for a work on the 

 insular portion of this suhregion : that is, the island groups 

 of the Canaries, Madeira, and the Azores. On the birds of 

 the Canaries we have lately acquired much valuable infor- 

 mation from the researches of Mr. Meade- Waldo, Canon 

 Tiistram, and Dr. Koenig (20-23), and I trust we may look 

 to one of these naturalists for the preparation of a complete 

 volume on the Canarian Avifauna. 



3. The Siberian Suhregion. 

 Since the issue of Radde^s ' Reisen im Siiden von Ost- 

 Sibirien,' some twenty years ago, the Russian naturalists 

 have given us no general work upon Siberian Ornithology, 

 although much has been done in the way of exploration and 

 investigation. The Museum of the Academy of Natural 

 Sciences of St. Petersburg is believed to contain an unrivalled 

 series of Siberian birds, of which, no doubt, we shall have a 

 good account in Herr Pleske's ' Ornithographia Rossica,' 

 above mentioned. 



4. The Mantchurian Suhregion. 

 It is a very difficult question to decide where to draw the 



