472 PROCEEDINGS OF THE ACADEMY OF 



Of the above M. macrorhynchus = M. mirandollii, Schleg. The 

 following references are assigned to the other two species which 

 are noticed in detail : 



M. CONCENTRICUS (p. 8.) 



Falco concentricus, Illig. in Mus. Berol. 



Nisus concentricus, Less. Tr. GO. D'Orb., Voy. 88. Schleg. Mus. 



P.-B., Astures, 51. 



Climacocercus concentricus, Caban. in Erichson's Archiv. I, 1844, 



265 ; in Tschudi, F. P. 18, 98; in Schoinb. Guiana, III. 735. Burm. 



Th. Bras. II, 86. 



Circaetus (Herpetotherea) concentricus, Kaup, Isis, 1847, 2G0 ; in 



Troscbel's Archiv. I, 1850, 37. 



Micrastur concentricus, Gray, Gen. 28 (Excl. Syn. Vieill.). Bonap. 



Comp. 30 (Excl. Syn. Vieill.); Rev. Zool. 1854, 537. Strickl. 



Orn. Syn. I, 1855, 123 (part.) 



Hab. Guiana (Mus. Berol.), Cayenne (Mus. Vindob.), Bahia, 

 Para (Mus. Berol.), Marabitanas, Barra do Rio Negro, Para 

 (Natterer), prope Rio de Janeiro (Zelebor), Bolivia (D'Orbigny), 

 Mexico (Bonap.). 



M. gilvicollis (p. 10.) 



Sparvius gilvicollis, Vieill., N. D. X, 323; Enc. Meth. 12G4. 

 Falco tri/asciatus, Natterer, Catal. Msc, No. 954. 

 Climacocercus concentricus, juv. Caban., in Tschudi, F. P. 99. 

 Falco concentricus, Pucheran, R. Z. 1850, 91. 



Hab. Cayenne (Mus. Vindob.), Brazil, Mattogrosso, S. Gabriel, 

 Borba (Natterer), Peru (Cabanis). 



M. MACRORHYNCHUS (p. 11.) 



Falco macrorhynchus, Natt. Cat. Msc. , No. 920. 



Hab. Brazil, Barra do Rio Negro, S. Maria de Brancho, Para 

 (Natt.). 



Remarks. The M. concentricus of Pelzeln, 1. c. = M. concen- 

 tricus, Ridgw., Pr. Boston Soc, N. H., May, 1873, p. 81. 



In this important notice Herr von Pelzeln discusses at length, 

 the points of distinction between his M. concentricus ( = M. concen- 

 tricus, Less.? ??), and M. gilvicollis (Vieill.), successfully estab- 

 lishing their distinctness. 



Sclater, P. L., M.A., Ph.D., F.R.S., and Salvin, Osbert, M.A., 

 F.L.S. Notes on the species of the genus Micrastur. <Proc. 

 Zool. Soc. London, May 27, 1869, 364-369. 



