Mammals 55 



In the plains and lowlands east of the mountains S. auduboni 

 bailey i of Merriam may be found; but in the same general region, 

 at least to the north, is another species, S. floridanus similis of 

 Nelson. The similis form may be known from the other by the 

 shorter ears, about two inches from the notch, and the "darker, 

 brighter nape and pectoral band". (Warren.) Fossil Leporidae, 

 found in the White River Oligocene of northeast Colorado, are 

 placed in the genus Palaeolagus of Leidy, and have been named 

 P. haydeni, Leidy, P. inter medius Matthew, P. turgidus Cope, and 

 P. triplex Cope. 



