Recently published Ornithological Works. 251 



The late Valerian Russow^ one of the most active and in- 

 telligent collectors of modern days^ accumulated a splendid 

 series of birds during the eight months that he passed in 

 Turkestan in 1878*. These have been now worked out by 

 Herr Theodor Pleske, and form the principal material used 

 in the preparation of the very useful memoir now before us. 

 Uussow^s headquarters during his sojourn in Turkestan was 

 at Tschinas^ or Chinas, on the Jaxartes ; but excursions were 

 made to the Iskander-Kul and other places, and Samarcand 

 was visited on the route home. The result of his exertions 

 was a collection of 800 skins of birds, besides eggs and nests 

 in great quantity. 



The known birds of Russian Turkestan, according to Herr 

 Pleske's list, are 419 in number. We observe that Bubo 

 turcomanus (usually regarded as a subspecies of B. maximus) 

 is declared to be quite distinct and more nearly allied in 

 structure to B. ascalaphus and B. bengalensis. Other note- 

 worthy species in the Turkestan list are Emberiza stewarti, 

 Phylloscopus pseudo-borealis , and Myiophoneus temmincki. 



59. Ridgway on new American Hawks. 



[Description of a new Western Subspecies of Accipiter velox (Wils.) 

 and Subspecific Diagnosis of A. cooperi mexicanus (Swains.). By R. 

 Ridgway. Proc. U.S. Nat. Mus. 1888, p. 92.] 



Subspecific characters are given of Accipiter velox rufilatus 

 from Western North America, and A. cooperi mexicanus from 

 Western U. S. and Mexico. 



60. Ridgway on (Estrelata sandwichensis. 



[Note on (Estrelata sandwichensis, Ridgw. By Robert Ridgway. Proc. 

 U.S. Nat. Mus. 1888, p. 104.] 



The type specimen of this species has been sent to IMr. 

 Salvin for comparison, and is pronounced to be = (E. yhceo- 

 pygia, Salvad., as Mr. Ridgway had already anticipated. 



* Cf. Ibis, 1879, p. 384. 



