358 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



The following table accentuates the difference in the two series, 

 the San Francisco group containing fewer specimens that vary from 

 what may be assumed to be the normal for the region. 



The color characters of the two sets differ to a marked degree. All 

 the specimens captured or seen in Golden Gate Park have the pro- 

 nounced spotted pattern. Of those from the Sausalito peninsula 

 about two-thirds of the examples are similarly marked, though in 

 darker tones. The remaining one- third have the striped pattern; 

 in these the ground is a dark brown, the dorsal and lateral spots are 

 absent, the median and lateral stripes are distinct, and are without 

 any red on the underside. 



GEOGRAPHIC VARIATION. 



In the Memoir of Doctor Ruthven it was pointed out that the speci- 

 mens of this species became smaller, the head shields reduced in num- 

 ber, and the scale rows less numerous as the range extended to the 

 north. The various sets presented in the following tables confirm 

 these findings. The one additional fact brought out is that these 

 dwarfed members of the species are prone to be found in localities 

 having lower temperatures, rather than merely a higher latitude. 



Merced County, California. 



Scale formulas 21—23—21—19—17 

 21—19-17 



Museum. 

 Cal.Ac.Sci. 



Locality. 



^S 



13635. 

 13636. 



Los Bafios. 

 ....do 



13637. 



13640 



36071 



Univ. Cal. 

 5428. 



....do... 



...do... 

 ....do... 



...do... 



25 25 56 54 



29 3853 39 



43 43 



27 28,63 60 



83129 125 



82116 122 



81 85'll2 115 



811 98 

 76 80 93 



83104 105 



81 82114 111 



10 

 9 



10 



11-10 



U 



11-9 



11 



The color of the specimens from Los Bafios is of one pattern : The 

 ground a uniform light-brownish ohve; faint trace of small dorsal 

 spots ; these tend to encroach upon the median stripe ; the median stripe 

 indicated by a paler tint than the ground color; below no spots. 



