REPTILES OF THE PACIFIC COAST. 205 



This form may be readily distinguished from T. lepto- 

 cephala, of the same regions, by its larger eye. 



Length to anus 165 410 500 540 650 690 



Length of tail 51 125 180 160 190 215 



Distribution. — This northern form of the Pacific Gar- 

 ter Snake inhabits British Columbia and the northwest- 

 ern corner of the United States in the neighborhood of 

 Puget Sound. It is abundant in King County, Wash- 

 ington, and on Vancouver Island, and has been re- 

 ported from Oregon. 



67. — Thamnophis leptocephala (Baird & Girard). Puget 

 Garter Snake. 



? Tropidonotus ordinoides, B. & G., Proc. Ac. Nat. Sci. Phila., VI, 



1852, p. 176 (type locality Pug-et Sound). 

 ? Tropidonotus conchmus, Hallow., Proc. Ac. Nat. Sci. Phila., VI, 



1852, p. 182 (type locality Oregon Territory). 

 Euiainia leptocephala, B. & G., Cat. N. A. Kept., Pt. I, Serp., 1853, 



p. 29 (type locality Puget Sound); Girard, U. S. Explor. 



Exped., Herp., 18.58, p. 151, pi. XIII, figs. 7-13. 

 ? ? Eutainia atrata, Kenn., U. S. Pac. K. K. Surv., XII, Pt. II, 1860, 



p. 296 (type locality "California"?). 

 Euiainia cooperi, Kenn., U. S. Pac. K. R. Surv., XII, Pt. II, 1860, 



p. 296, pi. XV, fig. 1 (localities Cathapoot'l and Willopah 



Valleys). 



Description. — Head distinct from neck, flat -topped, 

 with narrow, rounded snout, and temporal regions 

 sometimes slightly swollen. Rostral large, bounded 

 behind by interna- 

 sal, anterior nasal, 

 and first labial 

 plates. Plates on 

 top of head, a pair 

 of internasals, a 

 pair of prefrontals, a frontal, supraocular of each side, 

 and a pair of parietals. Anterior and posterior nasals 

 distinct. One loreal. One or two preoculars and about 



