NATURAL SCIENCES OF PHILADELPHIA. 471 



(4) Falco leueauchen, Temm., PI. Col. pi. 36, 1823. (=M. ruficollis, rufous 



phase, jur. ?) 



(5) Falco leucomeltts, Licht,, Verz. Doubl 1823, p. 62. (= M. melano- 



leucus. ) 

 (G) Falco xanthothorax, Temm., PI. Col. pi. 92, 1824. (=M. ruficollis, 

 rufous phase, adult.) 



(7) Falco brachypterus, Temm., 1. c. pis. 11G ljuv.), et 141 (adult). (= 



M. melauoleucus.) 



(8) JYisus concentricus, Less., Traite d'Orn. 1831, p. GO. (=M. concen- 



tricus ? ? ?) 



(9) Gamifex naso, Less., L'Echo du Monde Savant, annee 9, p. 1081. (= 



M. melanoleucus.) 



(10) Falco percontator, Cabot, Boston Journ. IV, 1844, 4G2. (=M. me- 



lanoleucus, adult.) 



(11) Micrastur guerilla, Cassin, Pr. Ac. Nat. Sci. Phila., 1848, 87. (- 



M. guerilla, young.) 



(12) Astur mirandollei, Schleg., Ned. Tijdschr. I, 1863, p. 130. (=M. 



mirandollii.) 



(13) Micrastur maerorhynchus, Pelz., Orn. Nov. 1865, p. 11. (=M. 



mirandollii.) 



(14) Glimacocercus zonotlwrax, Cabanis, Journ. fur Orn., 1865, p. 406. 



(=M. zonothorax.) 



Besides the above, authors generall}- quote Sparvius semitor- 

 quatus, Vieillot (Nouv. Diet., x. 1817, p. 322), for M. melanoleucus, 

 but we cannot identify it with that species (see p. 484); and Pel- 

 zeln quotes a manuscript or museum name of Natterer's, as fol- 

 lows : 



Falco trif 'asciatus, Natl., Catal. Msc. No. 954. (= M. giivicollis, Pelz., 

 = M. ruficollis, adult, plumbeous phase. ) 



The more important special discussions bearing upon the species 

 of this genus are the following: 



Pelzeln, August von. Eeise der Osterreichisclien Fregatte 

 Novara, urn die erde in den Jahren 1857, 1858, 1859, unter den 

 Befelden Commodore B. von \Vullerstorf-Urbair, Zoologischer 

 Theil. Erster Band. Vogel. Wein, 1865, pp. 176, quarto, pis. 6. 



The genus Micrastur is treated at considerable length on pp. 

 9-12. The following species are recognized on p. 12 : 



M. brachypterus (Temm.) M. guerilla Cassin. 



maerorhynchus (Natterer. ) concentricus (Illig. ) 



xanthothorax (Temm.) giivicollis (Vieill.) 



