136 CLASS REPTILIA. 



with blue. The tail is very long. Common in 

 Guiana.* 



EcpHiMOTES, Fitzinger, 



Have the teeth and pores of polychrus, but small 

 scales on the body only ; the tail, which is thick, has 

 large ones pointed and carinated. The head is 

 covered with plates. They have the somewhat short 

 and flatted form of certain agamae, rather than the 

 lank form of the polychri. 



The most common species (^Agama Tuherculata, 

 Spix, XVI. or Tropidurus TorquatuSy Pr. Max,) is 

 ash-coloured, sown with whitish drops, and has on 

 each side of the neck a black semi-collar. It lives 

 in Brazil.t 



The QuETzPALco, Oplurus, Cuv. 



Have also, with the teeth of the polychrus, the 

 forms of the agamae, but they want the pores on the 

 thighs, and the scales of their tail pointed and cari- 

 nated, give it some relation with that of the stelliones. 

 Their dorsal scales are also pointed and carinated, 

 but very small.t 



But one species is known, and belongs to Brazil. 



* Add, Polychrus Acutirostris. Spix, XIV. 



t The tropidurus of Prince Max de Wied, is not, as he thought, the 

 quetzpalco of Seba, though that also has some black semi-collars. 



J This name, quetzpalco, given by Seba to this species, appears cor- 

 rupted from the Mexican aqua quetz pallia, which appears to be a name 

 of the iguana. The Quetzpalco of Lacep. Rept. in 4= II. 497, is an Uro- 

 mastix : but it is the figure of Seba's animal that he cites. 



