156 COLUBRID^. 



B. Uniform black or blackish above. 



n. (S (Sc. 25; V. 120; Georgia. Smithsonian Instit. 



0. 56). [PJ- 



0, p. c? {Sc. 27 ; V. 131 ; N. America. 



0. 51) & ? (Sc. 25; 



V. 139 ; 0. 42). 



2. Heterodon simus. 



Coluber simu«, Linn. S. N. i. p. S75 (1766). 



heterodon, part., Baud. Mept. vii. p. 153 (1803). 



Heterodon platyrhinos, Sc/ileg. Fhxja. Serp. ii. p. 97, pi. iii. figs, 20- 

 22 (1837). 



simus, Holhr. N. Am. Herp. iv. p. 57, pi. xv. (1842) ; 



Baird §• Gir. Cat. N. Am. Rept. p. 59 (,1853) ; Garm. N. Am. 

 Mept. p. 76, pi. vi. fig. 4 (1883) ; Cope, Proc. U.S. Nat. Mus. xiv. 

 1892, p. 643 ; Hay, Batr. 8r Rept. Indiana, p. 105 (1893). 



platyrhinus, part., Dum. ^ Bihr. JSrp. Gen. vii. p. 766 



(1854). 



catesbyi, part., Gunth. Cat. p. 83 (1858). 



nasicus, part., Jan, Arch. Zool. Anai. Phys. ii. 1863, p. 220. 



Maxillary teeth 8 or 9+2. Eostral narrower than the distance 

 between the eyes ; several small shields separating the internasals 

 and the prsefrontals ; frontal as broad as long or slightly longer, 

 shorter than its distance from the end of the snout, as long as the 

 parietals ; eye surrounded by 10 or 11 shields in addition to the 

 supraocular ; eight upper labials ; one pair of chin-shields, in 

 contact with three or four lower labials. Scales strongly keeled, of 

 two or three outer rows smooth, in 25 or 27 rows. Ventrals 114- 

 132 ; anal divided ; subcaudals 30-55. Coloration as in H. platy- 

 rhinus. 



Total length 470 millim. ; tail 90. 



Mississippi and South Carolina. 



«. $ (Sc. 25; V. 121; Charleston. 



C. 33). 

 b-c. (S (Sc. 25; V. 114; N.America. College of Surgeons [P.]. 



C. 40) & yg. (Sc. 25 ; (Types of H. catesbyi.) 



V. 124; C. 34). 



3. Heterodon nasicus. 



Heterodon nasicus, Baird S/- Gir. in Stansbury, JE.vplor. Great Salt 

 lake, p. 852 (1852), and Cat. N. Am. Rept. p. 61 (1853), and in 

 Marcy, Explor. Red Riv. p. 222,pl. iv. (1853) ; Hallow. Proc. Ac. 

 Philad. 1856, p. 249 ; Baird, U.S. Mex. Bound. Surv. ii., Rept. 

 p. 18, pi. xi. fig. 1 (1859) ; Jan. Icon. G&n. 10, pi. v. (1865) : 

 Bocourt, Miss. Sc. Mex., Rept. p. 604, pi. xxxviii. figs. 1 & 2 

 (1886) ; Cope, Proc. U.S. Nat. Mus. xiv. 1892, p. 644. 



catesbyi, part., Gunth. Cat. p. 83 (1858). 



. — — kenneriyi, Kennicott, Proc. Ac. Philad. 1860, p. 336. 



nasicus, part., Jan, Arch. Zool. Anat. Phys. ii. 1863, p. 220. 



simus nasicus, Cope, Check-list N. Am. Rept. p. 43 (1875) ; 



Coues ^ Yarrow, Bull. U.S. Geol. Surv. iv. 1878, p. 270; Garm. 



