10, ANCISTRODON. §23 
p. 53, pl. ix. fig. 18 (1842); Dum. § Bibr. vii. p. 1494 (1854) ; 
Jan, Icon. Gén. 46, pl. v. fig. 1 (1874) ; Bocourt, Miss. Sc. Mex., 
Rept. pl. xxvii. fig. 2 (1882). , 
Cenchris contortrix, Gray, Zool. Misceli. p. 50 (1842), and Cat. p. 16 
(1849). 
P Trigonocephalus atrofuscus, Holbr. op. cit. 2nd ed. iii. p. 43, pl. ix. 
? Cenchris atrofuscus, Gray, Cat. p. 16. 
? Trigonocephalus histrionicus, Dum. § Bibr. Mém. Ac. Se. xxiii. 
1853, p. 534. 
Agkistrodon contortrix, Baird § Gir. Cat, N. Am. Rept. p. 17 
(1853); Hay, Batr. Rept. Ind. p. 123 (1892); Stejneger, Rep. 
US. Nat. Mus. f. 1893, p. 401, pl. iii. (1895). 
? Toxicophis atrofuscus, Badd § Gir. 1. c. p. 150. : 
Ancistrodon contortrix, Baird, Serp. N.Y. p. 13, pl. i. fig. 3 (1854) ; 
Garm. N. Am. Rept. p. 120, pl. viii. fig. 1 (1883); Cope, Pree. 
U.S. Nat. Mus. xiv. 1892, p. 683. 
P Ancistrodon atrofuscus, Cope, Check-List N. Am. Rept. p. 34 (1875). 
Snout rounded or truncate, not turned up, flat above, with sharp 
canthus. Rostral once and one fourth to once and a half as broad 
as deep; a pair of internasals and a pair of prefrontals ; frontal as 
long as or a little shorter than its distance from the end of the 
snout, usually longer than the parietals; loreal present, usually 
separating the upper preocular from the posterior nasal; two or 
three postoculars and one to three suboculars, separating the eye 
from the labials ; 8 (rarely 9) upper labials, second usually forming 
the anterior border of the loreal pit. Scales strongly keeled, in 23 
(rarely 25) rows. Ventrals 145-155; anal entire ; subcaudals 31— 
52, anterior single, posterior divided. Yellowish, pinkish, or pale 
reddish brown above, with dark brown, reddish-brown, or brick-red 
cross-bars contracting in the middle; these bars sometimes broken 
up on the vertebral line and forming alternating triangles; a dark 
temporal streak sometimes present; yellowish or reddish beneath, 
more or less profusely speckled with grey or brown and with a 
lateral series of large blackish spots. 
Total length 990 millim. ; tail 110. 
North America, from Massachusetts and Kansas to Northern 
Florida and Texas, 
a. 2 (V. 158; C. 46). Pittsburg, Pennsylvania. Christiania Mus. 
b. fg (V. 155; C. 39). New Harmony, H. Hanauer, Esq. 
Indiana. PP. 
ec. 2 (V. 152; C. 39). Kansas. 
d. 2 (V. 147; C. 45). Arkansas. Smithsonian Institu- 
tion. 
© (V. 151; C. 48). Louisiana. 
2 (V. 146; C. 42). Fort Worth, Texas. H. Hanauer, Esq. 
[P.]. 
é. 
gs 
g. d (V. 145; C. P). Texas. 
h-i,k. d (V. 151,158; N. America. Zoological Society. 
C. 49, 47) & Q@ 
(V.150; C. 46). 
