1918.] Haivks of the Genus MicrastvLT. 315 



The name used in the Catalogue, Sparvius semitorquatus 

 Vieill. (N. Diet. cVHist. Nat. x. 1917, p. 322), as was first 

 shown by Ridgway (Proc. Acad. Pliilad. 1875, p. 484), 

 cannot be used for tiiis species as the description is in 

 no way applicable. 



Hellraayr (Rev. Spix^schen Typen, p. 570) also rejected 

 Vieillot^s S. melanoJeucus on the ground that another bird 

 had been previously described under the same name on 

 p. 319 of the same work ; but tliis latter was not a new 

 description, but merely a citation of Latliam^s Faico melano- 

 leucus, and does not appear to invalidate the snbsequent 

 description of the new form. 



Distribution. From the State of Siualoa in Mexico south- 

 wards to Ecuador, but not farther south in the Andes, and 

 to the Prov. Salta in northern Argentina and Paraguay, 

 including Brazil and the Guianas. 



Micrastur mirandoUei. 



Astur mirandoUei Schlegel, Nederl. Tijdschr. i. 1863, 

 p. 130 : Dutch Guiana, 



Micrastur microrhynchus Pelzeln, Novara Reise Vog. 1865, 

 p. 11 : Para State, Brazil. 



Distribution. Costa Rica south to the basin of the Amazon 

 and Guiana, 



Micrastur ruficollis ruficollis. 



Sparvius ruficollis Vieillot, N, Diet. d'Hist. Nat. x. 1817, 

 p. 322 : South America [Rio Janeiro, apud Berlepsch & 

 Hartert, Nov. Zool. xv. 1898, p. 290]. 



Falco leucauchen Temm. PI. Col. livr. 52, 1824, pi. 306 : 

 Brazil [founded on a young bird of the rufous phase]. 



Falco xanthothorax Temm. PL Col. livr. 16, 1824, pi. 92: 

 Brazil and Guiana [founded on an adult bird of the rufous 

 phase] . 



Micrastur ruficollis jugularis Gurney, List Diurnal Birds 

 of Prey, 1884, p. 118: Bahia [founded on an adult of the 

 plumbeous phase]. 



2c2 



