448 Recently published Ornithological Works. 



of Heligoland will come in very conveniently as a basis for 

 future researches. Prof. Dalla Torre passed only a vacation 

 in the island. His memoir is accordingly mainly a compila- 

 tion^ but appears to be thoroughly and conscientiously done. 

 A complete review of the zoological literature relating to 

 Heligoland is prefaced, and the titles of 128 memoirs on the 

 subject are given in footnotes. 



As regards the account of the birds given in the present 

 memoir we need not say much. All observations on the 

 birds of Heligoland depend upon Herr Gatke, who has 

 studied its avifauna for the last thirty years. Herr Gatke 

 has now publis^hed his long-promised volume on the subject, 

 and it is to that volume that references must be made in 

 future. But Dalla Torre's list will still be useful, and gives 

 a good idea of the extraordinary wealth of the Ornis of 

 Heligoland. It is arranged according to the system and 

 nomenclature of Dresser's ' List of European Birds.' 



68. Divight on the Horned Larks of North America. 



[The Horned Larks of North America. By Jonathan Dwight, Jan. 

 ' The Auk; vii. p. 188.] 



Mr. D wight has made a special study of the American 

 Larks of the genus Otocorys, and with the assistance of his 

 friends and correspondents has been able to examine a 

 series of 2002 specimens of this group. The conclusion 

 arrived at is that the various local forms '' intergrade " so 

 much that trinomialism does not satisfy the problem, although 

 it " gives relief." Mr. Dwight concludes to call the form 

 of N.E. ISorth America O. alpestris, as identical with that of 

 Northern Europe, and to arrange 10 other forms from 

 different areas as subspecies. Of these, O. a. adusta from 

 Southern Arizona and New Mexico, and O. a. merriUi from 

 Eastern Oregon, Washington, and British Columbia, are now 

 differentiated for the first time. A capital outline map is 

 added showing the areas of the 11 forms very plainly. 



69. Evans on the Birds of the Spey Valley. 



[Birds observed in the Valley of the Spey, 1889. By Wni. Evans, 

 F.R.S.E. 'Scottish Naturalist,' 1891, p. .5.] * 



