VAKIATIONS OF GARTER-SNAKES. 



129 



Veracruz, all have 17-19-17 scale rows or less, while none of the three 

 specimens from the States of Mexico and Guanajuato have other than 

 19-17-15, and one of the Guatemala specimens has 19-21-19-17. 

 Such a reduction in the number ot scale rows would represent a dwarf- 

 ing within the form, but, regardless as to whether or not this apparent 

 tendency is borne out by future investigations, it is quite evident from 

 the ])redominance of the smaller dorsal scale formulas together with 

 the evidently small number of labials that the form is, as a whole, a 

 dwarfed one, so much so indeed that the number of scales in the dorsal, 

 supralabial,infralabial, and ventral series attains the minimum for the 

 genus, the form being more reduced than hutleri in this regard. It 

 should also be noted that the size of all of the specimens obtained is 

 small. 



Measurements and sculellation of ThamnopJds scalaris Copcfi 



Museum. 



Field Museum. 

 Do 



Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 



Do 



U.S. National Mu- 

 seum. 

 Do 



Do. 



Do. 

 Do. 

 Do. 

 Do. 



Num- 

 ber. 



1517 

 1517 



1517 



1517 



1517 



1517 



1517 



1517 



1523 

 12115 



30497 

 7076 



7070 



7076 



7076 



32281 



Locality. 



Orizaba, Veracruz. . . 



Mount Orizaba, Vera- 

 cruz. 

 do 



.do. 

 .do. 

 .do. 

 .do. 

 .do. 



do 



Orizaba, Veracruz. 



-do. 



Dorsals. 



"Alpine region," Ori- 



17-1',;-17-15 

 17-15 



17-15 



17-15 

 17-19-17-15 

 17-19-17-15 



17-15 



17-15 



17-19-17 

 17-19-17-15 



17-19-17-15 



il7-19-17-15 



zaba, Veracruz. 



..do 17-19-17-15 



..do 17-19-17-15 



-.do 17-15 



19-17 



Do 12675 



Do. 



Academy Natural 

 Science, P h i 1 a- 

 delphia. 



127.30 

 11694 



Valley of Mexico and 



Toluca. 

 Guanaiuato 



Me.xico, Mexico 



.Talapa, Veracruz 



19-17-15 



19-17 



17-19-17-15 



7 

 7 

 7 

 7 

 7 



7 j 9 

 7 I 9 

 7 i 9 



9 



9 j 1-3 



9 l-» 



1 



10 1-3 



■10 ! 1-3 



1-3 61 

 1-2 74 



1-3 



1-2 65 

 66 

 60 

 75 



1-2 75 



r' 



U- 



316 

 406 



185 

 207 

 335 

 385 



387 

 410 

 340 





0.27 



.25 

 .24 

 .23 

 .27 

 .20 



.23 



.25 



.22 



.27 

 .25 

 .29 

 .20 



.20 

 .19 

 .28 



o Since this table was compiled I have examined four specimens of scalaris from Tecpam, Guatemala, 

 in the Field Museum. Three have 19-17 and one 19-21-19-17 scale rows. 



