Vol. 6] 



Miller: Avifauna of Fossil Lake. 



si 



CIRCUS HUDSONIUS (LINNAEUS). 



This third addition to the known avifauna of the Fossil Lake 

 Beds is also represented by a single tarsus. The specimen was 

 identified as C. hudsonius by Lucas, and the determination is 

 verified by the writer through comparison with the same bone 

 from a large female specimen of that species. The Fossil Lake 

 specimen is appreciably smaller, but shows no differences not 

 readily accounted for through difference in sex. 



