20 REPTILES. 



the side of the face and temples. Waaler and Schlegel consider 

 the number of shields on the nose to afford a good character ; but 

 the specimens in the Museum are very different in this respect : the 

 two young ones have a pair of shields occupying the front half of the 

 space between the superciliary shields. 



1. The Cascavella. Crotalus horridus, Linn. Syst. Nat. 

 i. 372. Daud. Kept. v. 311, t. 69,/. 1. Gray, Zool. Misc. 51. 

 Schlegel, Phys. Serp. 561, t. 20, /. 12, 13, 14. Neuw. Ahbild. xi. 

 t. 3. C. cascavella, Spix, Serp. Braz. 61, t. 24. C. adamanteus, 

 Beauvais, Trans. Amer. Phil. Soc. iv. 368. Holhrook, N. A. Erp. 

 iii. 17, t. 2. Buibuira, Lacep. Quad. Ovip. ii. 390, t. 18,/. 1. Boi- 

 cininga, Marcgrave, Piso, 274. Crotalus Simus, Latr. Rept. iii. 202. 

 Seha, ii. t. 95, /. I. Caudisona terrilica, Laur. Rept. 93, 96. Seha, 

 ii. t. 95, /. 1. Col. Javana, Laur. Rept. Seba, i. t. 70, /. 12 (no 

 rattle). Vipera Javanus, Daud. C. rhombifer, Latr. Rept. iii. 197. 

 Daud. Rept. v. 323, t. 40, /. 22. Merrem, Tent. 157. C. durissus, 

 Shaw, Zool. iii. 233, /. 89, (not description). C . Oregonus, Holhrook, 

 N. Amer. Erp. iii. 21, t. 3, var. ? 



Brown, with a broad brown streak on each side of the back of 

 the neck, and with brown spots and oblique whole cross-bars for 

 leaving lozenge-shaped spots. 



a. In spirits. Adult; bleached. N.America. From Sir Hans 



Sloan e's collection. 



Nose with two pairs of symmetrical shields ; the front pair close 

 together ; the hinder pair ovate, concave, separated by a small pair 

 of scales. 



Crotalus durissus, Shaiv, MSS. B. M. 



h. Inspirits. Half grown. N.America. Venezuela. From Mr. 



Dyson's collection. 



Nose with two pairs of symmetrical shields ; the front pair tri- 

 angular, close together ; the hinder pair ovate, concave, with a cen- 

 tral keel, and nearly close together. 



c. In spirits. Young. N. America, Venezuela. From Mr. Dyson's 



collection. 



Nose with three pairs of symmetrical shields, all close together ; 

 the front pair triangular ; the second square ; the hinder elongate, 

 occupying the front half of the space between the superciliary 

 shields. 



d. In spirits. Young. W. Indies .f* Presented by Miss Saul. 



Nose-shields like specimen c. 



e. In spirits. Young. Columbia. From Mr. Brandt's collection. 



Nose-shields small, unequal. 



