FEE-DE-LANCE. 



79, 



on the ground. A rudiment of the curious caudal appendage of 

 the American Rattlesnakes is found as a simple spine-like scale in 

 the Asiatic species, constituting the genus Halys. 



Some have the head covered with scales, having small shields 

 on the edge of the forehead and brows ; the cheeks are scaly, and 

 the tail ends in a spine. Of these, the American genus Craspe- 

 docephalus and the Asiatic genus Trimeresurus have .the sub-caudal 

 plates two-rowed to the tip. 



The genus Craspedocepkalus comprises the terrible Fer-de-lance 

 of certain islands in the West Indies, which occurs on the main- 

 land of South America, where four other species are recognised 

 — one of them being found as far north as Mexico.] 



The Ter-de-lance ( C. lanceolatus) is met with in Martinique, 



I 



Fig. 19- — Fer-de-lance {Iriffonocephala mycalee). 



Santa Lucia, and in the little island of Boquin, near St. Yincent. 

 It attains to a length of nearly six feet ; its colour is not always 

 yellow, sometimes it is greyish, and even marbled with brown ; the 



