238 COLUBRID. 
tudinal series of small blackish spots; lower parts uniform 
yellowish. . 
Total length 810 millim. ; tail 190. 
Mexico; Lower California ; Arizona and Utah. 
a-g, h,t. g (V. 138; ©.?), Presidio, W. Mexico. Mr. A. Forrer [C.]. 
9 (V. 14, 143, 141, 142, 
142, 139; 'C. 70, 77, 68, 
69, ?, 68), & hgr. (V. 136, 
143; C. 76, 66). 
38. Tropidonotus clarkii. 
Tropidonotus fasciatus, part., Schleg. Phys. Serp. ii. p. 323 (1837). ~ 
Regina clarkii, Baird § Gir. Cat. N. Am. Rept. p. 48 (1853). 
Tropidonotts fasciatus, var. iv., Dum. § Bibr. vii. p. 578 (1854). 
medusa, Giinth. Cat. p. 78 (1858). 
—— clarkii, Cope, Proc. Ac. Philad. 1861, p.74; Jan, Arch. Zool. 
Anat. Phys. iii. 1865, p. 231, and Icon, Gén. 27, pl, vi. fig. 1 (1868) ; 
A, K. Fisher, Am. Nat. 1887, p. 672. 
ornatus, Jan, 1. ¢. p. 218. 
—— liberis, var. clarkii, Garm. N. Am. Rept. p, 142 (1883). 
Natrix clarkii, Cope, Proc. U.S. Nat. Mus. xiv. 1892, p. 669. 
Eye rather small. Rostral broader than deep, visible from 
above ; nasal usually semidivided; internasals much narrowed in 
front, as long as broad or longer, as long as or a little shorter than 
the prefrontals ; frontal once and two thirds to twice as long as 
broad, as long as its distance from the end of the snout, shorter 
than the parietals; loreal longer than deep; one prw- and two or 
three postoculars ; temporals 1+38; eight upper labials, fourth and 
fifth entering the eye; five or six lower labials in contact with the" 
anterior chin-shields, which are shorter than the posterior. Scales 
in 21 rows, strongly keeled, outer row distinctly keeled. Ventrals 
129-132; anal divided; subcaudals 57-70. Dark brown or 
blackish olive above, with three yellowish stripes; blackish or 
reddish brown inferiorly, with a yellow lateral stripe and a median 
series of yellow triangular spots, which may be confluent into a 
stripe. 
Total length 830 millim. ; tail 190. 
Florida, Louisiana, Texas. 
a. 9 (V.181; C. 65). Pensacola, Florida. C. Bollman, Esq. [C.}. 
b. 2 (V. 131; C. 70). Texas, 
¢. Yo (V.131; C.?). . N, America, (Types of 7’. medusa.) 
39. Tropidonotus compressicauda. 
Nerodia compressicauda, Kennicott, Proc. Ac. Philad. 1860, p. 335. 
Tropidonotus ustus, Cope, Proc. Ac. Philad, 1860, p. 340. 
compsolemus, Cope, l. c. p. 368. 
—— compressicaudus, Cope, Proc. Ac. Philad. 1861, p. 74; Garm. 
N. Am. Rept. p. 27 (1883). 
— compressicaudus walkeri, Yarrow, Proc. U.S. Nat. Mus. vi. 
1883, p. 154, ; 
