578 VIPERID&. 
4. Crotalus durissus. 
Linn. Amen, Acad. i, p. 500 (1749). . 
Crotalus durissus, Linn. S. N. i. p. 372 (1766); Shaw, Zool. iii. 
p. 333, pl. Lxxxix. (1802). 
—- adamanteus, Pal. de Beauv. Trans. Amer, Philos. Soc. iv. 1799, 
p. 368, pl. —; Say, Amer. Journ. Sc. i. 1819, p. 263 ; Ae # 
‘Am. Hi 77, pl. xvi. (1838), and ond ed rp: A OE 
(1842) ; and &§ Gir. Cat. N. Am. Rept. p. 3 (1853), a Rep. 
U.S. Sure. R. R., x. Rept. pl. xxiv. fig. 9 (1859) ; Jan, Icon. Gén. 
46, pl. ii. fig. 2 (1874) ; * Gati. N. Am. Rept. p. 112 (1883) ; Opes 
Proc, U.S. Nat. Mus. = 1892, p. 689; Stejneger, Rep. U.S. Nat. 
Mus, f. 1893, p. 483, x. (1895). 
rhombifer, Latr. ot iii. & 197 (1802); Daud. Rept. v. 
thee gs Ix. figs. 22 & 23, pl Ixix fig. 5 1808) ; Dum. § 
tbr. vii. p. 1470, pl. lxxxiv. b. fig. 3 (1854). 
—~- horridus, part., Harl. Med. Phys. Res. p. 133 (1835). 
terrificus (non ’Laur.), Leconte, Proc. Ac. Philad. 1858, p. 419; 
Cope, Proc. Ac. Philad. 1859, p- 337, 
Caudisona adamantea, Cope, Proc. Ac. Philad. 1866, p. 309. 
Canthus rostralis obtuse. Rostral deeper than broad, in contact 
with the anterior nasal; upper surface of snout covered with 
scales or small irregular shields; 7 or 8 longitudinal series of 
scales between the supraoculars, the width of which is much less 
than the interspace between them; three or four series of scales 
between the eye and the labials; 13 to 16 upper labials. Scales 
in 25-29 rows, dorsals strongly keeled. Ventrals 169-181; anal 
entire ; subcaudals 24-32. Pale greyish or brownish above, with 
a dorsal series of large blackish rhombs, usually with lighter centres, 
edged with yellowish; snout blackish, with a yellowish cross-line 
between the eyes, yellowish margins to the rostral shields, and a 
yellowish vertical streak between the rostral and the nostril, on the 
anterior nasal and first upper labial; a broad blackish band, edged 
with yellowish aboye and beneath, extends from the supravcular, 
over the eye, to the four or five last upper labials ; end of tail 
usually black ; yellowish beneath, more or less spotted with brown 
or black. 
The largest species of the genus, reaching a length of 8 feet. 
South-eastern United States from North Carolina to the Florida 
Keys and the Mississippi River. 
a. ea 29; V.181; Orlando, Florida. : 
db. a 0) 29; V 171; United States, Smithsonian Institution. 
« § N. America. 
5. Crotalus horridus. 
Cateshy, Nat. Hist. Carol. i. pl. xli. (1748). 
Crotalus horridus, Linn, Mus. Ad. Frid. p. 39 (1754), ert b oe 
872 (1766) ; Leconte, Proe. Ac, Philad. 1858, p. 417 ; ; 
red: Ae. Philad, 1859, p. 388; Garm. N. Am. Pept. >. 14S 
