The Striped Snakes Garter Snakes 



convey illustrations of the general run of colouration of the 

 typical representatives of the different species and that many wide 

 diversities of both colour and pattern occur among these snakes. 

 Consequently the key can be nothing but a general outline of 

 the genus Eiitcenia. Those species marked with a * exhibit phases 

 of variation that may be very confusing to the beginner. Such 

 variations are treated in separate keys under the heads of the 

 respective reptiles to which they appeal, in the detailed descrip- 

 tions following the key. 



Only those species occurring in the United States and north- 

 ern Mexico have been considered. Several species inhabit 

 Mexico and Central America, but it is necessary that our museums 

 should possess larger series than those now existing, before a 

 fair estimate of the standing of these extreme southern snakes, 

 may be given. 



The key follows:* 



Division A. General Pattern. Three Yellowish Stripes on a Darker 

 Ground-colour. 



'a. Very slender. Tail a third or more of the total length. 

 Brown or black; three, vivid yellow stripes. 



RIBBON SNAKE, E. saurita. 

 Distribution. United States east of the Mis- 

 sissippi. 



Olive, brown or black; yellow stripes on the sides 

 but none on the back except for a short dis- 

 tance behind the head. 



SOUTHERN RIBBON SNAKE, E. Sdckeni. 



Distribution. South Carolina, Georgia and 



Florida. 



Moderately slender. Tail less than a third the total 

 length. 



Brown or black; three yellow stripes those on 

 sides paler than the one on back. 



WESTERN RIBBON SNAKE, E. proximo.* 



Distribution. United States west of the Mis- 

 sissippi, except in Indiana and Illinois; 

 southward to Mexico. 



Moderately stout. Tail about a quarter the total length. 

 Ashy-brown; three, narrow yellow stripes. 



ARIZONA GARTER SNAKE, E. megalopS. 



Distribution. New Mexico, Arizona and 



Mexico. 



Body stout. Tail about a quarter the total length. 

 Brown or black; three, rather broad yellow 

 stripes . 



PLAINS GARTER SNAKE, E. radix. 



Distribution. Indiana to the Rockies; Canada 

 to Texas. A very common species. 



GROUP I. 



Side stripes on 

 the third and 

 fourth rows of 

 scales. 



* From Arthur Erwin Brown, Superintendent of the Zoological 

 Gardens, in Philadelphia, who is one of the foremost authorities on the 

 variations of North American snakes, the writer has received many 

 valuable suggestions regarding this genus. 



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