160 Recently published Ornithological Works. 



than the latter (weighed after being blown). Dr. Rey gives 

 an interesting formula for Cuckoo's eggs ; the length multi- 

 plied by the breadth (in millimeters) divided by the weight 

 (in milligrams) varies from \\ to 2, by far the greater 

 number of eggs giving a quotient between 1*4 and 1*8. 



Dr. Rey is of opinion that the average number of eggs 

 laid by each Cuckoo in a season is about 20, and that they 

 are laid every alternate day, making the total laying-period 

 about 40 days. Statistics of more than a thousand Cuckoos' 

 eggs are given, and an enormous number of facts are thus 

 brought together in this very interesting disquisition. 



26. Rothschild on Albinism in Birds. 



[On Albino Swallows and Wheatears. By the Hon. Walter Rotli- 

 scbild. Novitates Zoologicse, i. p. 667.] 



Mr. Rothschild's remarks refer to the relationship of 

 albinos to each other, and to their occurrence in nests of the 

 same parents for several years together. 



27. Rothschild on Chalcopsittacus duivenbodei. 



[On tlie Habitat of Chalcojmttacus duivenhodei, Dubois. By the ITou. 

 Walter Rothschild. Novitates Zoologicse, i. p. 677.] 



INIr. Rothschild has received a specimen of this rare Lory 

 from near Stephansort, in German New Guinea. The exact 

 locality was previously unknown. 



28. Rothschild and Hartert on a new form of Pigeon. 

 [Salvadorina waigiuensis, gen. nov, et sp. nov. By the Hon. Walter 



Rothschild and Ernst Hartert. Novitates Zoologicse, i. p. 683.] 



Salvadorina ivaigiuensis is a new form of Anatidse from 

 Waigiou, of somewhat uncertain affinities. A single speci- 

 men was received at Tring in a large collection of skins made 

 in North-western Nevr Guinea and the adjacent islands by 

 Heer Bruijn of Ternate. 



29. Schaloiv on the Oology of the Ratitse. 



[Beitriige zur Oologie der recenten Ratiten. Von Herman Schalow. 

 J. f. O. 1894, p. 1.] 



Herr Schalow gives us in this memoir an excellent resume 



