156 COLUBRID*. 



B. Uniform black or blackish above. 



. c? (Sc. 25; V. 120; Georgia. Smithsonian Inatit. 



C. 56). [P.]. 



o, p. < (Sc. 27 ; V. 131 ; N. America. 



C. 51) & $ (Sc. 25; 



V. 189 ; C. 42). 



2. Heteroion simus. 



Coluber simus, Linn. S. N. i. p. 375 (1766). 



heterodon, part., Daud. Kept. vii. p. 153 (1803). 

 Heterodon platyrkinos, Schleg. Phys. Serp. ii. p. 07, pi. iii. figs. 20- 



22 (1837). 



simus, Holbr. N. Am. Herp. iv. p. 57, pi. xv. (184:?); 



Baird # Gir. Cat. N. Am. Sept. p. 59 (1853); Garm. N. Am. 

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

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



platyrhinus, part., jDitm. fy Bibr. Erp. Gen. vii. p. 766 



(1854). 



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



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



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

 between the eyes ; several small shields separating the internasals 

 and the praefrontals ; 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. 



a. $ (Sc. 25; V. 121; Charleston. 



C. 33). 

 b-c. <5 (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 8f Gir. in Stansbury, E.i-plor. Great Salt 

 Lake, p. 352 (1852), and Cat. N. Am. Kept. p. 61. (1853), and in 

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

 Philad. 1856, p. 249 ; Baird, U.S. Mex. Bound. Surv. ii., Ri^t. 

 p. 18, pi. xi. tig. 1 (1859) ; Jan. Icon. Gen. 10, pi. v. (1865) ; 

 Jiocourt, Miss. He. Mex., Rept. p. 604, pi. xxxviii. figs. 1 & 2 

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



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



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



nasicus, part., Jan, Arch. Zool. Anat. Phy*. 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. 



