156 COLUBRID&. 
B. Uniform black or blackish above. 
n. do (Se. 25; V. 120; Georgia. Smithsonian Instit. 
C. 56). [P.] 
0, p. od (Sc. 27; V. 181; N. America. 
C. 51) & Q@ (Se. 25; 
V. 189; C. 42). 
2. Heterodon simus. 
Coluber simus, Zinn. S. N. i. p. 875 (1766). 
heterodon, part., Daud. Rept. vii. p. 153 (1803). 
Heterodon platyrhinos, Schley. Phys. Serp. ii. p. 97, pl. ili. figs, 20- 
22 (1887). 
simus, Holbr. N. Am. Herp. iv. p. 57, pl. xv. (1842); 
Baird § Gir. Cat. N. Am. Rept. p. 59 (1853); Garm. N, Am. 
Rept. p. 76, pl. vi. fig. 4 (1883) ; Cope, Proc. U.S. Nat. Mus. xiv. 
1892, p. 643; Hay, Batr. § Rept, Indiana, p. 105 (1893). 
— platyrhinus, part, Dum. § Bibr. Erp. Gén. 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 942. Rostral narrower than the distance 
between the eyes; several small shields separating the internasals 
and the preefrontals ; 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 80-55. Coloration as in H. platy- 
rhinus. 
Total length 470 millim. ; tail 90. 
Mississippi and South Carolina. 
a. 9 (Se. 25; V. 121; Charleston. 
C. 33). 
b-c. 6 (Sc. 25; V. 114; N. America. College of Surgeons [P. }. 
C. 40) & yg. (Sc. 25; (Types of H. cateshyi.) 
V. 124; C. 34). 
3. Heterodon nasicus. 
Heterodon nasicus, Baird § Gir. in Stansbury, Explor. 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, US. Mex. Bound. Surv, ii., Rept. 
p. 18, pl. xi. fig. 1 (1859); Jan. Icon. Gén. 10, pl. v. (1865) : 
Bocourt, Miss. Sc. Mex., Rept. p. 604, pl. xxxvill. figs. 1 & 2 
(1886) ; Cope, Proc. U.S. Nat. Mus, xiv. 1892, p. 644. 
catesbyi, part., Giinth. Cat. p. 83 (1858). 
kennerlyi, 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. 45 (1875); 
Coues § Yarrow, Bull. U.S. Geol. Surv. iv. 1878, p. 270; Garm. 
