13. CROTALUS. 579 
pl. ix. fig. 1 (1883); Cope, Proc. U.S. Nat. Mus. xiv. 1892, p. 693 ; 
Hay, Batr. Rept. Ind. p. 128 (1893) ; Stejneger, Rep. U.S. Nat. 
Mus. f. 1893, p. 426, pl. ix. (1895). . : 
COrotalophorus horridus, Houtt. Linn. Nat. Hist. vi. p. 8309 (1764). 
‘Caudisona durissus (non L.), Laur. Syn. Rept. p. 93 (1768). 
re boiquira, part., Lacép. Serp. ii. pp. 180, 190, pl. xviii. fig. 1 
). 
a tae Pal. de Beauv. Trans. Amer. Philos. Soc. iv. 1799, 
P- ) Pte —s 
durissus, Latr. Rept. iii. p. 190 (1802) ; Daud. Rept. v. p. 304, 
L. Ixviii. (1803); Harl. Proc. Ac. Philad. v. 1827, p.368, and Med. 
hys. Res. p. 132 (1835); Schleg. Phys. Serp. ii. p. 565, pl. xx. 
figs. 15 & 16 (1837); Storer, Rep. Rept. Massach. p. 233 (1859) ; 
Holbr. N. Am. Herp. ii. a 81, pl. xvii. (1838), and 2nd ed. iii. 
p. 9, pl. i. (1842); De Kay, N. York Faun. iii. p. 55, pl. ix. 
g. 19 (1842); Baird § Gir. Cat. N. Am. Rept. p. 1 (1853); Baird, 
Serp. N. York. p. 9, pl. i. fig. 1 (1854) ; Dum. § Bibr. vii. p. 1465, 
pl. lxxxiv. 0. fig. 1 (1854) ; Jan, Icon. Gén. 46, pl. i. (1874). 
atricaudatus, Latr. t. c. p. 209; Daud, t. c. p. 316. 
Crotalinus cyanurus, Rafin. Amer. Monthly Mag. iii. 1818, p. 446 *. 
Caudisona horrida, Flem. Philos. Zool. ii. p. 294 (1822) ; Cope, Proc. 
Ac. Philad. 1866, p. 309. 
Uropsophus durissus, Gray, Cat. p. 19 (1849). 
Crotalus horridus, part., Gray, 1. e. p. 20. 
Snout with obtuse canthus. Rostral as deep as broad, in contact 
‘with the anterior nasals and a pair of rather large internasals; a 
large shield between the internasal and supraocular; middle of 
snout with scales or small shields; supraoculars considerably 
narrower than the space between them, which is covered by 3 to 
8 longitudinal series of small scales; three or four series of scales 
between the eye and the labials; 12 to 16 upper labials. Scales 
in 23-29 rows, dorsals very strongly keeled. Ventrals 165-178 ; 
anal entire; subcaudals 19-29. Greyish brown above, usually 
with a rusty vertebral stripe and V- or M-shaped blackish cross- 
bands ; head uniform above, with a more or less distinct dark band 
from the eye to the angle of the mouth; usually a pair of roundish 
or triangular dark spots on the nape; neck with elongate spots or 
interrupted stripes; yellowish beneath, uniform or speckled or 
spotted with blackish ; end of tail blackish. 
Total length 1340 millim.; tail 135. 
United States, from Massachusetts and Iowa to Northern Florida 
and Texas. 
a. 3 (Sc. 25; V. 178; New Orleans. 
G. 29). 
b. Yg. (Se.25;V.170; Texas. 
C 
. 24). 
e. Yg. (Se. 25; V.177; Arkansas. 
C. 21). : 
d. Q@ (Se. 29; V.176;  N. America. Sir H. Sloane [P. |}. 
C. 24). 
* T have not been able to verify this reference. 
272 
