Vol. VIII] VAN DENBURGH AMD SLEVIN— GARTER-SNAKES 209 



23. They should be recognized as a separate subspecies, 

 Thamnophis ordinoides bisaitatiis. 



24. In coloration biscufofus is intermediate between elegans 

 and vagrans, but more like vagrans. 



25. Snakes of the vagrans type reach the coast, or nearly 

 there, in British Columbia and northern Washington and in 

 southern Oregon and Del Norte County, California. 



26. Since a majority of these snakes have two preoculars, it 

 seems best to call these also hisciitatus, as was done in "The 

 Reptiles of the Pacific Coast." 



27. Two snakes from the San Pedro Martir Mountains, 

 Lower California, Mexico, which were formerly recorded as 

 hamrnondii (Proc. Cal. Acad. Sci., Ser. 2, Vol. V. p. 1007) are 

 typical vagrans. 



We are thus led to the recognition of eight members of the 

 elegans group of garter-snakes, as follows : — 



1. Thamnophis ordinoides ordinoides 



2. Thamnophis ordinoides atratus 



3. Thamnophis ordinoides elegans 



4. Thamnophis ordinoides biscutatus 



5. Thamnophis ordinoides vagrans 



6. Thamnophis ordinoides couchii. 



7. Thamnophis ordinoides hammondii 



8. Thamnophis marcianus 



The curves of scale-counts shown in Figures 2 to 6 will serve 

 to show the differences and relationships of these subspecies as 

 regards these characters. The curves show the percentage of 

 specimens having each number of scales. Each subspecies is 

 represented by a separate line. In all these charts the 



( 1 ) line of crosses represents, ordinoides 



(2) continuous line, atratus 



(3) dotted line, /^wr/^to/?/.? (Klamath Lake) 



(4) broken line with longest 



segments, elegans (Sierra Nevada) 



(5) broken line with shortest 



segments, elegans (San Bernardino Mts.) 



(6) broken line with intenne- 



diate segments, vagrans (Utah, Idaho, Nevada) 



(7) line of oooooooooooooo, hammondii 



(8) line of vvvvvvvvvvvvvv, couchii 



