10. TEOPIDOKOTTTS. 201 



I. Teopidonotus. — Maxillary teeth not more than 30, the hinder 

 gradually enlarged (see fig. 11, p. 170). Ej-es and nostrils 

 lateral ; internasal shields broadly truncate anteriorly. 



1. Tropidonotns leptocephalus. 



Eutainia leptocephala, Baird Sf Gir. Cat. N. Am. Rept. p. -29 

 (1853) ; Gir. U.S. Explor. Exped., Herp. p. 151, pi. xiii. figs. 7- 

 18 (1858) ; Cooper, Rep. U.S. Explor. Surv. R. R. xii. pt. ii. 

 p. 297 (1860) ; Cope, in Wheeler's Rep. U.S. Surv. W. IQOth 

 Mer. V. p. 550 (1875), and Proc. Ac. Philad. 1888, p. 28, and 

 Proc. U.S. Nat. Miis. xiv. 1892, p. 660. 



Tropidonotus ordinatus, part., Giinth. Cat. p. 73 (1858). 



Eutainia cooperi, Kennicott, Rep. U.S. Explor. Surv. R. R. xii. 

 pt. ii. p. 296, pi. XV. fig. 1 (1860) ; Cope, Wheeler's Rep. p. 551. 



atrata, Kennicott, I. c. p. 296 ; Cope, I. c. 



Tropidonotus cooperi, Jan, Arch. Zool. Anat. Phys. ii. 1865, p. 212. 



sirtalis, var. leptocephala, Jan, Icon. Gin. 35, pi. iv, fig. 2 



(1867) ; Garm.N. Am. Rept. p. 139 (1883). 



sirtalis, var. infernalis, part., Garm. I. c. p. 24. 



Eye- rather small, considerably smaller than in T. ordinatus; head 

 rather elongate, but slightly distinct from neck. Eostral broader 

 than deep, visible from above ; internasals as long as broad or 

 broader, a little shorter than the prefrontals ; -frontal once and a 

 half to once and two thirds as long as broad, as long as its distance 

 from the end of the snout, shorter than the parietals ; loreal 

 usually longer than deep ; two (rarely one) prte- and three post- 

 oculars ; temporals 1 + 2; seven (rarely six or eight) upper labials, 

 third and fourth entering the eye ; four lower labials in contact 

 with the anterior chin-shields, which are shorter than the posterior. 

 Scales in 17 (rarely 19) rows, strongly keeled, outer row smooth or 

 feebly keeled. Ventrals 139-152 ; anal entire ; suboaudals 54- 

 70. Olive or brown above, with small black spots, with or without 

 three more or less distinct light longitudinal streaks, the median 

 yellow or orange, the laterals greenish yellow ; upper lip yellowish ; 

 usually a black streak behind the eye, and sometimes a black blotch 

 on each side of the occiput ; usually a pair of yellow dots close 

 together on the suture between the parietal shields ; lower parts 

 olive or plumbeous grey, with or without black dots. 



Total length 600 millim. ; tail 140. 



North America west of the Hocky Mountains, from British 

 Columbia to North California. 



A. Scales in 17 rows ; light dorsal stripes distinct. 



a-h. <S (V. 145, 149, 147, 148 ; Sumass Prairies, Boundary Oommis- 



0. 66, 60, 62, 64), $ (V. 139 ; Brit. Columbia. sion [0.]. 



C. 60), hgr. (V.146; C. 5-4), 



& yg. (V. 146, 141 ; 0. 56, 



60). 

 i-m. S (V. 149, 147; 0. 63, Vancouver Id. H.M.S. 'Plumper.' 



• 68), 2 (V. 160; 0. 56), & 



Vg. (V. 139; 0.58). 



