240 coLTTBEiDa;. 



41. Tropidonotus rigidus. 



Coluber rigidus, Say, Journ. Ac. Philad. iv. 1825, p. 239 ; Harl. 



Med. Fhys. Res. p. 118 (1835). 

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



Bum. Sr Bibr. vii. p. 577 (1854). 

 Eegina rigida, Baii-d 8r 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. p. 28 (1883;. 

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



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

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

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

 prsefrontals ; frontal twice as long as broad, louger than its distance 

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

 as long as deep ; two prse- 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 182-142 : 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. Bollman, Esq. [C.]. 

 h. S (V. 142 ; C. 62). N. America. Lord AmpthiU [P.]. 



42. Tropidonotus grahami. 



Regina grahamii, Baird §• Gir. Cat. N. Am. Rept. p. 47 (1853) ; 



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

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



grahamii, Cope, Proc, Ac. Philad. 1861, 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. Eostral 

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

 nasals narrow, longer than broad, as long as the prffifrontals 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 prse- and two or 

 three postoculars ; temporals l-(-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 



