V °'i907 :iV ] Recent Literature. 231 



Hellmayr on the Types of Little-known Neotropical Birds. 1 — The 

 author, in collecting material for his proposed work on the 'Birds of Brazil,' 

 soon found that in order to clear up the uncertainty of nomenclature 

 existing respecting many of the species it would be necessary to examine 

 the original types. "Thus," he says, "during the last four years, I have 

 carefully examined a great number of types in various museums of Europe, 

 and I intend to publish the results of these studies in a series of papers 

 of which this is the first instalment." During the last two years several 

 other papers on the same general subject have already appeared, some 

 of which have been noticed in this journal. In the present paper 64 species 

 are critically considered, in connection with which many nomenclatorial 

 questions are discussed, often involving the detailed revision of specific 

 groups, and new allocations of names. A list of the species treated is given 

 at the end of the paper, showing at a glance the results reached. Dr. Hell- 

 mayr's researches in this field are most opportune and should receive cordial 

 welcome. — J. A. A. 



Hellmayr on the Birds of Para, Brazil. — These ' Notes ' 2 relate to a 

 collection of birds received at the Tring Museum from Mr. W. Hoffmanns 

 numbering "420 specimens, representing 120 species, of which no less 

 than 21 are new to the fauna of Para," while four are new to science, 

 and others represent species previously known only from single specimens. 

 Besides the localities, dates of collecting, and a transcript of the collector's 

 notes on the color of the iris and soft parts, many technical and nomen- 

 clatorial notes are also included. — J. A. A. 



Wood's Twenty-five Years of Bird Migration at Ann Arbor, Mich- 

 igan.' 3 — The area is the immediate vicinity of Ann Arbor, and the period, 

 1880 to 1905, inclusive; the number of species is 267. "The list includes all 

 the species observed in this vicinity, and the record for each species shows 

 whether it is common or rare." The main list forms a sheet 15J by 284/ 

 inches, and is entitled 'Table of First Arrivals,' Two other tabulations 

 are 'Table of Migration Waves,' and 'Table of Species occurring on more 

 than one Wave.' The period of greatest migration occurs the last week 

 in April and the first week in May. The hardier birds, which arrive early, 

 "do not come at a stated time each year, but are governed in their migra- 

 tion to a certain extent by favorable weather and food conditions." The 

 later migrants tend to arrive at about the same time each year, and appear 



1 Critical Notes on the Types of Little-known Species of Neotropical Birds. By 

 C. E. Hellmayr. Part I. Novitates Zoologies;, Vol. XIII, July, 1906, pp. 305-352. 



2 Notes on a Second Collection of Birds from the District of Para, Brazil. By 

 C. E. Hellmayr. Nov. Zool., Vol. XIII, July, 1906, pp. 353-385. 



3 Twenty-five Years of Bird Migration at Ann Arbor, Michigan. By Norman 

 A. Wood. Eighth Annual Report of the Michigan Academy of Science, pp. 151- 

 156, and large folding table. 



