VARIATIONS 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 woukl 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 predominance of the smaller tforsal scale formulas together \\\{\\ 

 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, antl 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 obtainetl is 

 small. 



Measurements and scutellation of Tliatnnophis sralaris Cope."' 



Museum. 



Field Mut^euin. 

 Do 



Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 



Niiiii- 

 Iht. 



Locality. 



1.")1T 

 l.')17 



C)ri7.abii, Veracruz. . . . 



Mount ()ri7,al)a, Vera- 

 cruz, 

 .do 



Do 



U.S. National Mu- 

 seum. 

 Do 



Do. 

 Do. 

 Do. 

 Do. 



32281 



Do. 



Valley of Me.xico and 



Toluea. 

 (iuanaiuato 



Do 12730 



Academy Natural ' 11694 

 Science, Phila-l 

 delphia. 



Mexico, Mexico. . . 

 Jalapa, Veracruz. 



17-lit-17-1.5 

 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 

 17-19-17-15 



17-15 



19-17 



19-17-15 



19-17 



17-19-17-15 



1-3 



9 

 10 

 9 1-2 



1-3 I 68 

 1-2 I 65 



....' 66 



1-2 

 1-3 



1-2 i 75 



1-2 ' 75 



9 1-3 I 61 



9 1-3 59 



10 ' 1-3 I 75 



141 

 138 



137 



136 



140 



138 



137 



138 



144 

 135 



145 

 145 



134 

 137 

 142 

 143 



144 

 151 

 138 



172 



§,t^ so 



0.27 



.25 

 .24 

 .23 

 .27 

 .20 



.29 

 .20 



.20 

 .19 

 .28 



1 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. 



