486 Recently published Ornithological Works. 



memoration of the Society's fiftieth anniversary, contains, 

 amongst other excellent memoirs, one upon the native birds 

 of Holland by Herr H. Koller. It is a list of 306 species, 

 to each of which are added particulars of the time and loca- 

 lity of its occurrence in Holland, and an enumeration of the 

 specimens in the Society ^s collection. 



93. Menzhier on the Posthumous Works of Severtzoff. 



[CEuvres Posthumes de M. le Dr. N. A. Sewertzow, publi6es par la 

 Soci^t6 Iinp6riale des Naturalistes de Moscou, r^digees par M. M. Menz- 

 bier. Nouv. Mt5m. Soc. Imp. d. Nat. Moscou, xv. p. 141,] 



This is a second of the ' Etudes sur les variations d'age 

 des Aquilines palearctiques et leur valeur taxonomique,' of 

 which the first has already been noticed (Ibis, 1886, p. 197). 

 In the present Part the Golden Eagles are discussed and 

 divided into Aquila chrysa'etus, inhabiting Northern Europe 

 and Asia, A. nobilis, of temperate and Southern Russia, A. 

 daphanea, Hodgs., of Turkestan, Northern India, Mongolia, 

 and China, and A. fulva, subdivided into five varieties or 

 subspecies, for the rest of the world. Our great authority on 

 Accipitres will, no doubt, deal with this subject when the work 

 is completed by the two further Parts which are promised. 



94. Meyer and Helm on Ornitliological Stations in Saxony. 



[II. Jaliresbericht (1886) der ornithologischen Beobachtungstationen 

 im Kciuigreich Sachsen, bearbeitet von Dr. A. B. Meyer und von Dr. F. 

 Helm. Bvo. Dresden : 1887.] 



Without making invidious comparisons, we may say that 

 it is a pleasure to turn to such a Report as the present. 

 Here everything is in order; a list shows at a glance the 

 14 species observed in 1885 but not noticed in 1886, while 

 a second list contains the 33 additional species recorded in 

 the latter, with due reference to the pages where the details 

 of each will be found. Remarks on 199 species are followed 

 by a systematic index, so that a worker can quickly turu to 

 any family, genus, or species he may wish to look-up, and, 

 as iu last year's Report, there is an excellent coloured map. 



