578 VIPBEID^. 



4. Crotalus durissns. 



Linn. Amcen. Acad. i. p. 500 (1749). 



Crotalus duiissus, Linn. S. N. i. p. 372 (1766) ; Shaw, Zool. iii. 



p. 333, pi. Ixxxix. (1802). 

 adamanteus, Pal. de Beauv. Trans. Amer. Philos. Soc. iv. 1799, 



p. 368, pi. — ; Say, Amer. Journ. So. i. 1819, p. 263 ; Solbr. N. 



Am. Herp. ii. p. 77, pi. xvi. (1838), and 2ud ed. iii. p. 17, pi. ii. 



(1842) ; Baird ^ Qir. Cat. N. Am. Mept. p. 3 (1853), and Rep. 



U.S. Surv. R. R., x. Rept. pi. xxiv. lig. 2 (1859) ; Jan, Icon. Gin. 



46, pi. ii. fig. 2 (1874) ; Oarm. N. Am. Rept. p. 112 (1883) ; Cope, 



Proc. U.S. Nat. Mus. xiv. 1892, p. 689 ; Stejneffer, Rep. U.S. Nat. 



Mm./. 1893, p. 433, pi. z. (1895). 

 rhombifer, Latr. Rept. iii. p. 197 (1802) ; Daud. Rept. v. 



p. 323, pi. Ik. figs. 22 & 23, & pi. kix. fig. 2 (1803) ; Bum. Sr 



Bibr. vii. p. 1470, pi. Ixxxiv. b. fig. 3 (1854). 



homdus, part., Harl. Med. Phys. Res. p. 133 (1835). 



terrifieus {non Laur.), Leconte, Proc. Ac. Philad. 1853, p. 419 ; 



Cope, Proc. Ac. Philad. 1859, p. 837. 

 Caudisona adamantea. Cope, Proc. Ac. Philad. 1866, p. 309. 



Canthus rostralis obtuse. Eostral 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 

 hetween 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 

 hetween 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 above and beneath, extends from the supraocular, 

 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 CaroUna to the Florida 

 Keys and the Mississippi River. 



^i. Yg. (Sc. 29 ; V. 181 ; Orlando, Florida. 



0. 24). 

 b. Yg. (Sc. 29 ; V 171 : United States. Smithsonian Institution. 



0. 30). 

 <;. Skull. N. America. 



6. Crotalns horridus. 



Catesby, Nat. Bist. Carol, i. pi. xli. (1743). 



Crotalus horridus, Linn. Mus. Ad. Frid. p. 39 (1754), and 8. N. i. 

 p. 372 (1766) ; Leconte, Proc. Ac. Philad. 1853, p. 417 ; Cope, 

 Proc. Ac. Philad. 1859, p. 338; Oarm. N. Am. Rept. p. 115, 



