238 COLUBRID^. 



tudiiKil series of small blackish spots; lower parts uniform 

 jellowish. 



Total length 810 millim. : tail 190. 



Mexico ; Lower California ; Arizona and Utah. 



a-g, h, i. S (V. 138 ; 0. ?), Presidio, W. Mexico. Mr. A. Forrer [C.]. 

 5 (V. 144, 14:1, 141, 142, 

 142, 139; C. 70, 77, 68, 

 «), ?, 68), vt Lot. (V. 130, 

 143 ; C. 70, 00). 



38. Tropidonotus clarkii. 



Tropidonotus fasciatus, part., Schleg. Phys. Serp. ii. p. 323 (1837). 

 Regina clarldi, Baird 8f Gir. Cat. N. Am. Rejjt. p. 48 (1853). 

 TropidonoLus fasciatus, var. iv., Dmn. S^- Bibr. vii. p. 573 (1854). 



medusa, Gilnth. Cat. p. 78 (1858). 



clarkii, Cope, Proc. Ac. Philacl. 1801, p. 74; Jan, Arch. ZooJ. 



Anat. Phys. iii. 1865, p. 231, and Icon. Gen. 27, pi, vi. fig. 1 (1868) ; 



A. K. Fisher, Am. Nat. 1887, p. 672. 



ornatus, Jan, ^. c. p. 218. 



liberis, var. clarkii, Garm. N. Am. Rept. p. 142 (1883). 



Natrix clarkii, Cope, Proc. U.S. Nat. Mus. xiv. 1892, p. 609. 



Eye rather small. Rostral broader than deep, visible from 

 above ; nasal usually semidivided ; iuternasals much narrowed in 

 front, as long as broad or longer, as long as or a little shorter than 

 the pnefrontals ; 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 prne- and two or 

 three postoculars ; temporals 1 + 3 ; 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. Yentrals 

 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 milUm. ; tail 190. 



Florida, Louisiana, Texas. 



a. 2 (V. 131 ; C. 65), Pensacola, Florida. C. BoUman, Esq. [C.]. 



b. 2 (V. 131 ; C. 70). Texas. ( .^ ^ y, ^ . 



c. Yg. (V. 131 ; C. ?). N. America. j ^^^^^^ ^^ ^ ' ^^^^"^^■) 



39. Tropidonotus compressicaiida, 



Nerodia compressicauda, Kennicott, Proc. Ac. Philad. 1860, p. 335. 

 Tropidonotus ustus, Coj)e, Proc. Ac. Philad. 1860, p. 340. 



compsoljemus. Cope, I. c. p. 368. 



compressicaudus, Co/7e, Proc. Ac. PM«f/. 1861, p. 74 ; Garm. 



N. Am. Rept. p. 27 (1883). 

 compressicaudus walkeri, Yarroiv, Proc. U.S. N'at. 3Iiis. vi. 



1883, p. 154. 



