CROCODILIANS, LIZARDS, AND SNAKES. 



987 



riorly. Upon the anterior third of the body irregular narrow vertical 

 bands extend from this, separated by black spaces of one and a half or 

 two scales in width, which spaces are sometimes inclosed by the conflu- 

 ence of the bands on each side of the black vertebral line. 



This subspecies may be distinguished from those called Eutcenia by 

 Baird and Girard by its divided postabdominal scutelke. It, how- 

 ever, bears quite a close resemblance to some of them, for example, 

 E. pickeringi. 



Cat. Nos. Gastrosteges. TJrosteges. Length. Tail. 



5281 



140 -fl. 

 154-1-1. 



72. 



71. 



700. 180. 



Natrix valida celwno Cope. 



NATRIX CLARKII Baird and Girard. 



Jiegina clarkii Baird aucl Girard, Cat, N. Amer. Kept., Pt. 1, Serp., 1853, p. 48. 

 Tropidonotits clarkii Cope, Proc. Acad. Nat. Sci. Phila., 1861, p. 74; Check-list 



N. Amer. Batr. Kept., 1875, p. 42. — Boulenger Cat. Snakes Brit. Mus., I, 



1893, p. 238. 

 Tropidonoius medusa Gunther, Cat. Cohibr. Snakes Brit. Mns., 1858, p. 78. 



Fig. 261. 



Natrix clarkii Baiki) and Girakd. 



= 1. 



Lake Catherine, Louisiana. 



Cat. No. 16677, U.S.N.M. 



Yellowish brown, with four longitudinal bands of deeper brown. 

 Abdomen dull yellow, with two clouded brown bands d(»tted with black. 

 One anteorbital. Dorsal rows of scales twenty-one, all carinated. 



