246 [May, 1S45. 



This species resembles very much our C. punclalus, but wants the spots 

 upon the abdomen. The latter, however, are occasionally absent in the punc- 

 tatus ,- it may, therefore, notwithstanding the remoteness of its habitat, very 

 possibly be the same species. It would appear to be common, four specimens 

 having been observed in the collection. 



Trigonocephalds Colombietisis. 



Description. — Head of moderate size, triangular, presenting two small plates 

 in front, and a row of smaller scales immediately behind; the rest of the upper 

 portion of the head is covered with small polygonal scales, those in front of the 

 supra-orbitar ridges are somewhat larger than the others; the rostral plate is 

 large and hexagonal ; the nostril is of moderate size; there is a deep fossa be- 

 tween the eye and the nostril ; the eyes are oval, rather large, and projecting ; 

 the supra-orbitar ridges are very prominent; there are seven superior labial 

 plates, of these the fifth is the largest, it is pentagonal ; the neck is slender ; 

 the body is triangular, thickest at the middle; the tail is short, and tapering to 

 a point ; the plates upon the under part of the tail are bifid ; the body is covered 

 above and upon the sides with quadrangular carinated scales. 



Abdominal scuta 207 : subcaudal 70. 



Colour. — Superior part of head, body and tail, of a light yellowish ash-colour ; 

 upon each side of the body is a row of blotches, triangular in shape, of a darker 

 colour than the rest of the body, approaching to olive ; the intervening spaces 

 present numerous spots of the same colour ; there is a row of dark coloured 

 spots extending along each side of the abdomen ; under surface of throat, abdo- 

 men and tail, are straw colour. 



Dimensions. 



Length of head, ... 



Greatest breadth, ... 



Length of body, ... 



Length of tail, ... 



This species resembles very much the Trigonocephalus lanceolatus, Oppel. 

 or Vipere jaune of the French, but differs from it in its habitat, (the latter 

 being found in Martinique,) and in the number of its plates. In the lanceolatus 

 there are 225 to 228 plates upon the abdomen, and from 59 to 61 upon the 

 tail. 



Leiolefis Auduboni. 



Description. — Head pyramidal, covered above with numerous polygonal 

 scales ; those upon the front of the head are much the largest ; they are seven- 

 teen or eighteen in number ; the rostral plate is pentagonal ; the frontal plates 

 are quadrangular; the nasal plates are large and pentagonal; the nostrils are 

 large and directed forwards ; there is a small quadrangular plate between the 

 nasal and the frontal plate ; there are five plates along the margin of the upper 

 jaw, they are oblong, quadrilateral; the eyes are oval; the eyelids are covered 



