Vol. 6] Miller: Avifauna of Pleistocene Cave Deposits. 391 



hence the characters of the hypo-tarsus, the intercotylar tuber- 

 osity and the tibial articulations remain undeterminable. 



There appear in the Potter Creek Cave collection the remains 

 of a condor the exact identity of which is not determinable. 

 These bones, ten in number, are all fragmentary. The size of 

 the form, as judged from the coracoid and humerus, is in excess 

 of Gymnogyps calif or nianus. Since the suggestion conveyed by 

 the robust tarsus of G. amplus is that of a large species, the 

 remains from Potter Creek are tentatively assigned to the latter 

 species. 



Measurements 



6. cali- O. call- 

 fornianus fornianus 



fossil Recent 0. amplus 

 No. 12161 No. 201 No. 9384 



Tarsometatarsus — 



Least transverse diameter of shaft 13.7 mm. 14.0 16.0 



Anteroposterior diameter of shaft at middle 



point 10.0 8.6 11.0 



Transverse diameter through trochleae 32.2 29.6 32.8 



Transverse diameter of inner trochlea 9.0 8.0 9.3 



Transverse diameter of outer trochlea 7.6 6.8 7.9 



BUTEO BOREALIS (Gmelin) 

 The red-tailed hawk is represented in the Potter Creek col- 

 lections only. The major part of a right humerus, a complete 

 femur and an imperfect tibiotarsus, parts which, judging from 

 their positions in the deposit, represent at least two different 

 individuals, prove beyond question the identity of the remains. 

 They compare perfectly with Recent specimens from California 

 ascribed to the variety Buteo borealis calurus. 



BUTEO SWAINSONI Bonaparte (?) 

 A fragmentary tarsometatarsus in the Samwel Cave collec- 

 tion is ascribed to this species. It is a typical buteonine shank, 

 but appreciably slender as compared with Buteo borealis. 



ARCHIBUTEO FEBRUGINEUS (Lichtenstein) 

 The species is represented by one specimen only, a right 

 humerus from Hawver Cave. The bone is broken away across 

 the deltoid crest, the shaft and distal portion are perfectly pre- 

 served with the exception of the external portion of the radial 



