Recently published Ornithological Works. 385 



of Paradise-birds ia the Tring Museum, wliich, if we include 

 the Bower-birds, contaius eggs of 23 diflereut forms. Notes 

 are given as to where and how they were obtained. 



A full plate (pi. X.) contains figures of these l)eautiful 

 objects, 



40. Hellinayr on the Species of Percnostola. 



[Uebersicht der Formen der Gattung Percnostola. Von C. E. Helknavr. 

 ^'erh. Oru. Gesellsch. Wien, viii. p. 140.] 



Mr. Helimayr writes on Percnostola, a Neotropical genus 

 of Formicariidae. Of this he admits only two of the older 

 species (P. ruffrons and P. r. minor) as subspecies, and 

 adds a third new subspecies — P. r. subcristata from the 

 Rio Negro. 



41. Helhnaijr on the South- American Species o/ Cha^tura. 



[Uebei'sicht der sudamericanischen Arten der Gattung Chcetura 

 (s. str.). Von C. E. Helimayr. Verb. Ura. Gesellscb. Wien, viii. p. 145.] 



The author enumerates 12 South-American species and 

 subspecies of this genus of Swifts, and gives full descriptions 

 and synonymy of each of them. But we confess our inability 

 to understand upon what grounds he calls some of them 

 " species ^^ and others " subspecies." He seems to place 

 them all on an exact equality. 



42. Helimayr on the Birds uf the Rio Madeira. 



[Tbe Birds of tbe Rio Madeira. By C. E. Ilellmajr. Xov. Zool. 

 xvii. no. 3 (Dec. 1910).] 



This memoir gives us a complete and well-prepared 

 account of the collection of birds made by the late Mr. W. 

 Hoffmanns in various localities on the Upper Rio JMadeira, in 

 1897 and 1898. The specimens, or most of them, are in the 

 Tring Museum. Mr. Hoffmanns had made a previous 

 collection in the same district, of which Mr. Helimayr wrote 

 an account in the ' Novitates Zoologicae ^ in 1907 (vol. xiv. 

 p. 343). On that occasion also a large selection went to the 

 Tring Museum. Thus, Mr. Helimayr had a fine series of some 

 2000 specimens to work upon, and the present article, in 



