Q 
SS 
10. rRoprponorvs. 201 
I, Trorrponotvs.—Maxillary teeth not more than 30, the hinder 
gradually enlarged (see fig. 11, p. 170), ‘Eyes and nostrils 
lateral; internasal shields broadly truncate anteriorly. 
—————... 
1. Tropidonotus leptocephalus. 
Eutainia leptocephala, Baird § Gir, Cat. N. Am. Rept. p. 29 
(1853) ; WS. Explor. ae Herp. p. 151, pl. xiii. fig: 7- 
13 (1858) ; Cooper, . US. Explor. Surv. R. R. xii. o ee 
Bae (1860) ; Cope, m Wheeler’s Rep. US. Surv. W. 
. 650 (1875), and Proc. if Philad. 1883, p. 28, site 
Pees v. . Nat. Mus. xiv. 1892, 
Tropidonotus ordinatus, part., Giinth. vr . 73 (1858). 
Eutainia coo ri, Kennicott, Rep. US. Surv. R. R. xii, 
pt. ii. p. 296, pl. xv. fig. 1 (1860); Cope, Wheeler's Rep. p. 551. 
—— atrata, Kennicott, lc. p. 296; Cope, lic. 
Tropidonotus cooperi, Jan, Arch. Zool. Anat, Phys. ii. 1865, p. 212. 
—— sirtalis, var. leptocephala, Jan, Icon. Gén. 35, pl. iv, fig. 2 
(1867) ; Garm. N. Am. Rept. p. 139 (1883). 
— sirtalis, var, infernalis, part., Garm. J. c. p. 24. 
Eye rather small, considerably smaller than in 7’. ordinatus ; head 
rather elongate, but slightly distinct from neck. Rostral 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) pre- and three post- 
oculars ; temporals 142; 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, Mronaly keeled, outer row smooth or 
feebly keeled. Ventrals 139-152; anal entire; subcaudals 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 Rocky Mountains, from British 
Columbia to North California. 
A. Scales in 17 rows; light dorsal stripes distinct, 
a-h. 3 (V. 145, 149, 147,148; Sumass Prairies, Boun Commis- 
G. 86, 60, 62°64), 9(V. 139; Brit: Columbia. _ sion [U.). 
0. 00), ge (V. 146; C. 54), 
& yg. (V. 146, 141; C. 56 
60). 
i-m. ¢ (V. 149, so C. . Vancouver Id. H.M.S, ‘ Plumper,’ 
68), eae (V. 160; ©. 56), & 
ya: ( ; ©. 58). 
Oe 
