S62 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 52. 



Curry County, Oregon. 



Scale formulas 17-19-17-15 

 17-15 



The color pattern of this set is quite simple; ground hght olive 

 brown, or brown ; spots usually absent, or indicated as darker shades 

 of brown; stripes indistinct or sharply marked, median brick red, 

 ateral faintly paler than ground color; below bluish grey, with or 

 without red. 



It will be noted that the predominant type of scale formula is the 

 one with 17 rows anteriorly and 15 posteriorly, this occurring in 75 

 per cent of the specimens. Those in the 17-19-17-15 class are either 

 asymmetrical or have very few scales in the added IV row. AH are 

 of small size, the average being about 400 mm. in length. 



In looking over the tables which wUl foUow of series from locaUties 

 to the north, it wiU be observed that the specimens are larger and the 

 increased scale formula of 17-19-17-15 again prevails as it does to 

 the immediate south. Incidentally, southwestern Oregon is one of 

 the coldest portions of the Pacific coast region, and the localities 

 mentioned to the north are actually much warmer. It becomes evi- 

 dent that the reduced size and lower scale counts in T. ordinoides are 

 correlated with colder climate rather than mere extension of the 

 range to more northern latitudes. 



