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University of California Publications. [Geology 



condyle. The characteristic region of the braehialis anticus is 

 perfect, thus the identification becomes positive. The size is 

 that of a large female specimen at hand. 



ACCIPITER VELOX (Wilson) 

 Represented in the Samvvel Cave collection by a single tarso- 

 metatarsus which is perfect except for the extreme head. In 

 size it is slightly stouter than a Recent juvenal at hand. 



FALCO SPARVERIUS Linnaeus 

 A perfect tarsus and humerus in the Samwel collections and 

 a humerus in the Potter Creek collection prove the presence of 

 the species in a form osteologically identical with the existing 

 phase. 



FALCO PEREGRINUS Tunstall 

 Four specimens from Potter Creek Cave represent the species. 

 The distribution of the material was such as to indicate at least 

 three individuals. 



G ER ANO AeTUS, sp. 



In the collection from Hawver Cave there appears the 

 humerus of a slightly built eagle almost identical in size with a 

 specimen of the existing Geranoaetus. The osteological char- 

 acters of the genus are, as regards the humerus, more closely like 

 those of Haliaetus. The size is however too small to be included 

 within the latter genus. In the asphalt of Rancho La Brea there 

 appear several species of the smaller long-shanked eagles. The 

 form under discussion may prove to belong to one of these Rancho 

 La Brea species, but the characters obtainable from the distal end 

 of the humerus are insufficient to differentiate it from the exist- 

 ing G. melanoleucus from South America. The bone from 

 Hawver Cave is slightly larger than the single specimen of the 

 South American form at hand, and the type tarsus of Geranoaetus 

 grinnelli from Rancho La Brea is likewise larger than the exist- 

 ing form. The Hawver Cave specimen does not however display 

 any osteological characters which would distinguish it from the 

 existing species. 



There also appears in the same collection a coracoid of a size 



