294 PROCEEDINGS OF THE ACADEMY OF [March, 



parietalis, while his figures of Blainville's specimen^*' suggest this species 

 rather than elegans; and as Cahfornia examples of both these forms 

 sometimes exhibit the infernalis style of coloring, I see no reason at 

 present to regard Blainville's type as anything more than the present 

 species. 



Eutaenia sirtalis pickeringi. 



Eutamia 'pickeringi B. and G., Cat. No. Am. Serp., p. 27 (1853). 



E. sirtalis trilineata (part) Cope, Proc. U. S. Nat. Mus., XIV, p. 665 (1892). 



In the extreme west of Oregon and Washington, and especially about 

 Puget Sound, a region of much moisture, melanism reaches an extreme 

 and fairly constant degree in E. s. 'pickeringi B. and G. and E. s. tri- 

 lineata Cope, the differences between which are trivial." 



E. s. pickeringi seems to be entitled to rank as a well-marked geo- 

 graphical form, always so dark as to obscure the spots, stripes usually 

 narrow, very distinct and variable in color, occasionally a little red on 

 the sides, and the ventral surface always more or less dark, sometimes 

 entirely 1^1 ack. 



Eutaenia sirtalis leptocephala. 



(t)Tropidonotus ordinoides B. and G., Proc. Acad. Nat. Sci.Phila.,1852, p. 176. 



Eidcenia leptocephala B. and G., Cat. No. Am. Serp., p. 29 (1S53). 



Entania atrata and E. cooperi Kenn., Pac. R. R. Surv., XII, Pt. 2, p. 296 



(1860). 

 E. infernalis vidua Cope, Proc. U. S. Nat. Mus., XIV, p. 658 (1892). 



This variable form is somewhat small in size and relatively stout; the 

 head and eye are notably smaller than in other subspecies of E. sirtalis, 

 and even more so than in E. e. elegans. 



The rows of scales are 17 or 19,theoutereithersmoothor keeled; upper 

 labials usually 7, but sometimes 6 er 8; preoculars occasionally 2 and 

 in a few cases 3. Posterior chin-shields much longer than the anterior. 

 The color is olive, greenish or blackish-brown, the three light stripes 

 variable in color and sometimes absent; spots small and hardly to be seen 

 in dark specimens ; labials sometimes narrowly margined; parietal spots 

 present; ventrals 139-152, yellow, greenish or dark slate. Some indi- 

 viduals with 19 rows and 7 labials so nearly resemble certain phases 

 of E. s. parietalis or E. s. pickeringi, and in fact some eastern E. s. 

 sirtalis, that I cannot regard it as more than a subspecies, occupying 

 British Columbia, western Washington and Oregon and northern 

 California. 



E. cooperi Kenn. is clearly referable to this form. It has already 

 been pointed out that the type of Tropidonotus ordinoides B. and G. 



^'^ Miss. Sci. au Mexique, etc., PI. 55, figs. 2, 2a, 2b. 



" Cope's examples of trilineata from Fort Benton, Montana, are probably E. s. 

 parietalis. 



