240 COLUBEIDiE. 



41. Tropidonotus rigidus. 



Coluber rif^idus, Say, Journ. yic. I'/iilad. iv. 182."), p. 239; Hurl. 



Med. riii/s. Bos. p. 118 (1835). 

 Tropidonotus rigidus, Holbr. N. Am. Herp. iv. p. 39, pi. x. (1842) ; 



Bum. 4- Dibr. vii. p. o77 (18o4). 

 Regina rigida, Baird ^ Gir. Cat. N. Am. Rept. p. 46 (1853). 

 Tropidonotus leberis, var. rigidus, Jan, Arch. Zool. Anat. Phys. iii. 



1865, p. 230 ; Garm. N. Am. Rept. ]>. 28 (1883). 

 Natrix rigida, Cope, Proc. U.S. Nat. 3Ius. xiv. 1892, p. 668. 



Head small, scarcely distinct from neck ; snout very short. Eye 

 moderate. Kostral broader than deep, visible from above ; nasal 

 semidivided ; internasals small, broader than long, shorter than the 

 praefrontals ; frontal twice as long as broad, longer than its distance 

 from the end of the snout, shorter than the parictals ; loreal nearly 

 as long as deep ; two pra)- and two postoculars ; temporals 1 + 2 ; 

 seven upper labials, third and fourth entering the eye ; five lower 

 labials in contact with the anterior chin-shields, which are nearly as 

 long as the posterior. Scales in 19 rows, strongly keeled, outer row 

 smooth, second feebly keeled. Ventrals 132-142 : anal divided ; 

 subcaudals 51-71. Olive-brown above, with or without a pair of 

 blackish dorsal stripes ; upper lip and lower parts yellow ; two 

 series of black spots along the belly, confluent into one anteriorly ; 

 a black line along the middle of the tail. 



Total length 510 millim. ; tail 120. 



United States, east of the Mississippi. 



a. Yg. (V. 141 ; 0. 61). Pensacola, Florida. C. BoUman, Esq. [C.]. 



b. S (V. 142 ; C. 62). N. America. Lord Ampthill [P.]. 



42. Tropidonotus grahami. 



Regina grahamii, Baird Sj- Gir. Cat. A\ Am. Rept. p. 47 (1853) ; 



H. Garm. Bull. Illin. Lab. iii. 1892, p. 273. 

 Tropidonotus grahamii, part., Giinth. Cat. p. 78 (1858). 



■ grahamii, Cojje, Proc. Ac. Philad. 1801, p. 297. 



leberis, var. grahamii, Jan, Arch. Zool. Anat. Phys. iii. 1865, 



p. 229, and Icon. Gen. 27, pi. v. fig. 1 (1868) ; Garm. N. Am. Rept. 



p. 28 (1883). 

 Natrix grahamii, Cope, Proc. U.S. Nat. Mus. xiv. 1892, p. 668. 



Head small, not distinct from neck. Eye rather small. Rostral 

 broader than deep, visible from above ; nasal semidivided ; inter- 

 nasals narrow, longer than broad, as long as the praefrontals or a 

 little shorter; 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 as long as deep or deeper ; two prae- and two or 

 three postoculars ; temporals 1-1-2 ; seven upper labials, third and 

 fourth entering the eye ; five lower labials in contact with the 

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

 Scales in 19 or 21 rows, very strongly keeled, outer row feebly or 



