204 



CALIFORNIA ACADEMY OF SCIENCES. 



66. — Thamnophis parietalis pickeringii (Baird & Girard). 

 Northwestern Garter Snake. 



Eutainia Pickeringii, B. & G., Cat. N. A. Eept., Pt. 1, Serp., 1853, 



p. 27 (type locality Puget Sound); Gikard, U. S. Explor. 



Exped., Herp., 1858, p. 150, pi. XIII, figs. 14-20. 

 Eutainia concinna, B. & G., Cat. N. A. Eept., Pt. 1, Serp., 1853, 



p. 146. 

 Eutainia sirtalis concinna, Cope, Proc. U. S. Nat. Mus., XIV, 1891, 



p. 664. 

 Eutoenia sirtalis pickeringii. Cope, Proc. U. S. Nat. Miis., XIV, 1891, 



p. 665. 

 Eutcenia sirtalis trilineata. Cope, Proc. U. S. Nat. Mus., XIV, 1891, 



p. 665 (part), ("Port Townsend, Oregon"). 



Description. — This subspecies differs from T. parietalis 

 in color only. Some specimens approach the typical form 

 in having red blotches on the sides. The normal color- 



ation is, however, fairly constant. The ground color 



above is deep blackish brown or black, with three light 



longitudinal lines. These lines are usually very narrow, 



but may be as wide as in the typical 



T. parietalis, and may be white, 



grayish, bluish, greenish, or pale 



yellow. The median dorsal line may 



fade out posteriorly, and the lateral 



lines may be very faint. A narrow 



black line sometimes runs along the tips of the gastro- 



steges. The top of the head is blackish, its sides light. 



The lower surfaces are bluish black, slate, or greenish, 



lighter anteriorly; the throat being yellowish white. 



