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PROCEEDINGS OF THE NATIONAL MUSEUM. 



show more than a tendency in this direction is well established by 

 characteristics shown in the following tables : 



Characters of Hyla regilla from California west of the Sierra Nevada Range. 



The numerical differences between these averages are small, but 

 unmistakable, and considering the number of specimens taken into 

 account, namely, 95, from several localities, they can be depended upon. 

 Thirty-seven specimens from the Panamint Mountains also show the 

 same relation between increase in size (age) and color. 



Characters of Hyla regilla from the Panamint Mountains. 



This last shows the condition among individuals from an altitude of 

 6,000 to 7,000 feet, and the same holds true for 48 specimens from low 

 desert valleys, Saratoga Springs and Panamint Valley, California, and 

 Ash Meadows and Oasis and Vegas valleys, Nevada. 



Characters of Hyla regilla from desert valleys. 



The law is good for 51 individuals from Oregon and Washington, 

 with the slight exception that the average length in style II is greater 

 than that in style III, an irregularity of no moment, considering that 

 only 7 specimens of each were measured and in view of the figures 

 already given. 



Characters of Hyla regilla from Oregon and Washington. 



