OPHIDES. CROTALID^. 



36i 



Herpeton Daud. Head furnished with two soft scaly 

 tentacula ; the crown covered with plates ; those on 

 the belly narrow ; tail long. 



H. tentaculatus Daud. 



PsEUDOBOA Oppel. Head shorty enlarged behind, and 

 covered with large plates ; back carinated, with a 

 longitudinal range of scales, wider than those of the 

 sides. 



P. fasciata Schn. Russ. pi. 3. 



Family 2. CROTALID^. Poisonous Snakes. 



Terrestrial; upper jaw without teeth, but furnished with 

 two large moveable poisonous fangs ; tail short, conical, 

 and cylindrical. 



Cbotalus. Rattle- 

 snakes. Scales on 

 the head similar 

 to those on the 

 back ; tail termi- 

 nating in a rattle ; 

 head triangular. 



C. horridus Linn. Catesby, ii. pi. 41. {Jig. 114.) 



Caudisona Fitz. Resembles the last, but the head is 

 covered with plates. 



C. miliaris. Catesby, ii. pi. 42. 



TisiPHONE Fitz. Tail terminating in a spine or sting ; 



head covered with plates, as far as behind the eyes. 



T. Shawii Grai/. Catesby, ii. pi. 45. 



