1912] Miller: Pacific Coast Avian Palaeontology 



95 



more intimate relationships of the forms are not discussed by 

 the authors. 



List of Species Assigned to the Suborder Falcones that are Known 

 to Occur as Fossils in North America 



Species marked with the. asterisk are extinct or are no longer repre- 

 sented in the region. Species marked with the double asterisk are con- 

 sidered to show their closest relationship to forms at present more southern 

 in their distribution. 



Elanus leueurus (Vieillot), Eancho La Brea. 

 Circus hudsonius (Linnaeus), Eancho La Brea, Fossil Lake. 

 **Circus sp. (smaller than hudsonius), Eancho La Brea. 

 Aquila chrysaetos (Linnaeus), Eancho La Brea. 

 *Aquila sodalis Shufeldt, Fossil Lake. 

 *Aquila pliogryps Shufeldt, Fossil Lake. 

 *Aquila dananus Marsh, Loup Fork. 

 Haliaetus leucocephalus (Linnaeus), Eancho La Brea. 

 **Morphnus woodwardi Miller, Eancho La Brea. 

 **Geranoaetus grinnelli Miller, Eancho La Brea. 

 **Geranoaetus melanoleucus Auct. (?), Hawver Cave. 

 **G"eranoaetus fragilis Miller, Eancho La Brea. 



Buteo borealis (Gmelin), Eancho La Brea, Potter Creek Cave. 

 Buteo swainsoni (?) Bonaparte, Samwel Cave. 

 *Buteo, sp. (larger than Archibuteo), Eancho La Brea. 

 Archibuteo ferrugineus (Lichtenstein) , Hawver Cave. 

 Falco peregrinus Tunstall, Eancho La Brea, Potter Creek Cave. 

 *Falco, sp. (smaller than peregrinus), Eancho La Brea. 

 Falco sparverius Linnaeus, Eancho La Brea, Samwel Cave and Potter 

 Creek Cave. 

 **Polyborus tharus Auct., Eancho La Brea. 

 *Palaeoborus umbrosus (Cope), Loup Fork of New Mexico. 

 Aecipiter velox (Wilson), Samwel Cave. 



The species of Circus remaining undetermined is a form 

 smaller than the North American C. hudsonius. It is not named 

 in this paper since no opportunity has been presented to com- 

 pare it with the South American species Circus cinereus and 

 C. maculosa. The last two species, it seems, are smaller than 

 C. hudsonius and possibly the asphalt specimens referred to the 

 indeterminate species are of a form identical with the one or 

 the other. 



The material from Rancho La Brea representing Polyborus 

 is abundant and embraces most parts of the appendicular skele- 

 ton and the beak, including the characteristic nareal region. 

 All this material was compared very carefully with the Recent 



