Recently published Oi'nithological Works. 163 



species are recognized, and their various subspecific forms 

 reviewed ; two new subspecies are named. 



Of Oological papers : — 



Dr. H. Szielasko (pp. 52-117 & 229-361) has an im- 

 portant paper, illustrated by several plates, on the structure 

 of the egg-shell in various groups of birds, and on its 

 correlations with classification and taxonomy. 



Forester Wendlandt (pp. 409-443) reviews the breeding 

 habits of European Owls, giving elaborate measurements of 

 the very large series of eggs he has been able to examine. 



L. Schuster (pp. 540-546) describes the nests and eggs 

 of various birds met with by him in German East Africa. 



Of papers on migration and allied subjects : — 



Prof. Jagerskiold, of the Gothenburg Museum (pp. 380- 

 388), relates how he "ringed" 7Q Rough-legged Buzzards 

 in Swedish Lapland in July 1911, and gives a sketch-map 

 showing the localities, chiefly in Prussia to the south of the 

 Baltic, whence as many as twelve of these were subsequently 

 recaptured, 



Paul Kollibay (pp. 612-617) writes on the irruption of 

 the Siberian Nutcracker into Silesia in the spring of 1911. 



F. von Lucanus (pp. 117-124) finds from observations 

 made from air-ships that the flight of birds is very seldom 

 at altitudes over 400 m. ( = 1200 ft.), while no birds at all 

 have been hitherto detected at an elevation of over 1000 ni. 



Of papers on Zoogeography : — 



Dr. E. Snethlage writes (pp. 469-539) on the geographical 

 distribution of birds in the region of the lower Amazon 

 basin, and discusses their relation to the botanical divisions 

 of the same area. These are : the virgin forest above flood- 

 level, the prairie or campos region above flood-level, and the 

 corresponding regions below the flood-level of the great 

 rivers. A fifth region, the ^' Capoeira," where the forest 

 has been cleared by man and its place taken by secondary 

 growth, is recognised. Each of these regions possesss its 

 special avifaunal facies, which is here discussed. 



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