Recently published Oriiit ho logical Works. 175 



comparison. Plalycercus mastersianus is a rare species, 

 recently described, of which two examples only are known. 



20. Ridgway's Directions for Collecting Birds. 



[Directions for Collecting Birds. ]]y Robert Ridgway. Part A of 

 the Bull. U.S. Nat. Mus. no. 39, 1891.] 



Mr. Ridgway's directions for collecting birds are very plain 

 and quite concise. At the same time they seem to embrace all 

 the particulars concerning which information is required by 

 the modern collector. We have great pleasure in recom- 

 mending them as containing all the most recent details on a 

 subject of permanent interest to ornithologists. 



21. Riker and Chapman on the Birds of Sunt ar em. 



[A List of the Birds observed at Santarem, Brazil. By Clarence B. 

 Riker. With Annotations by Frank M. Chapman, Auk, vols, vii.-viii. 

 (1890-91).] 



With the assistance of Mr. Chapman, Mr. Riker now 

 furnishes us with a complete account of the collections which 

 he made at Diamantina, near Santarem, on the Lower Ama- 

 zons, during two visits in 1884. and 1887, the new species of 

 which specimens were obtained having been previously de- 

 scribed by Mr. Ridgway and Mr. Allen. In order to make 

 the list as complete as possible, species are inserted of which 

 examples have been obtained by other collectors in the same 

 district, and the result gives us a total of 251 species known to 

 occur at Santarem or in its immediate vicinity. Mr. Riker's 

 preliminary notes on the district and field-notes on some of 

 the species are of great interest, and we much hope that he 

 may be able to return to Santarem and complete his good 

 work, for we venture to say that by extending his area a little 

 the list of species might be nearly doubled. 



The authors have decided that the Mimus of the Lower 

 Amazons is the true M. saturninus of Lichtenstein, and is dis- 

 tinct from that of S.E. Brazil, commonly referred to M. sa- 

 turninus. They therefore propose to call the latter Mimus 

 arenaceus. The Tyrant referred by Mr. Allen (Bull, Essex 



