314 Recently published Ornithological Works. 



44. Ridgway on new Birds from Aldabra and the adjoining 

 Islands. 



[Descriptions of some new Birds collected on the Islands of Aldabra 

 and Assumption, northwest of Madagascar, by Dr. W. L, Abbott. By 

 Kobert Ridgway. Proc. U.S. Nat. Mns. xvi. p. 597.] 



Dr. W. L. Abbott, well known from his exploration of 

 Kilimandjaro, appears to have visited also the Aldabra and 

 Amirante groups of islands, N.W. of Madagascar. Mr. 

 Ridgway describes the following species from specimens in 

 his collections : — Ixocincia madagascariensis rostrata, Bu- 

 changa aldabrana, Foudia aldabrana, Rougetiiis aldabranus , 

 and Ibis abbotti from Aldabra; SuJa abbotti from Assumption 

 Island ; and Turtur saturatus from the Amirante group. 



45. Ridgivay on some Costai'ican Birds. 



[On a small Collection of Birds from Costa Rica. By Robert Ridgway. 

 Proc. U.S. Nat. Mus. xvi. p. 609.] 



Mr. Ridgway gives us notes on some birds submitted to 

 his examination by the authorities of the Costarican Museum. 

 " Buthrawpis cceruleigularis, Cherrie," is a new Tanager of 

 the group of B. arccsi. Additional specimens of Scytalopus 

 argentifrons, Ridgw., are described. Altogether 10 species 

 are commented upon. 



46. Ridgivay on the Genus Myiarchus. 



[Remarks on the Avian Genus Myiarchus, with special reference to 

 M.yueatanensis, Lawrence. By Robert Ridgway. Proc. U.S. Nat. Mus. 

 xvi. p. 605.] 



It is truly said by Mr. Ridgway at the commencement of 

 this essay that " the discrimination and identification of the 

 species and geographical races of the genus Myiarchus are 

 one of the most difficult tasks with which the student of 

 Neotropical Ornithology has to deal.^' Mr. Ridgway now 

 proposes to separate as new generic forms M. magnirostris, 

 of the Galapagos, and M. flaimnulatus, Lawrence, and to call 

 the former Eribates, and the latter Deltarhynchiis. He also 

 gives reasons for maintaining his former views as to the 

 validity of M, yucatanensis, Lawrence. 



