LIZARDS. 225 



Darwin's DiPLOL^Mus. Diplolaemus Darwinii, ^e/^, ZooL 

 Beagle, Rept. 20, t. 10. 



Scales of the head convex ; tail rather longer than the body 

 and head. 



a, b. Young and adult, in spirits. Patagonia, Port Desire. Pre- 

 sented by Charles Darwin, Esq. 

 Bibron's Diplol^mus. Diplolaemus Bibronii, Bell, ZooL 



Beagle, 21, ^. 21. 



Scales of the head flat ; tail shorter than the body and head. 



a, b. S. America. Chili. Presented by Thomas Bell, Esq. (from 



the collection of Capt. P. P. King, K.N.) 

 c, d. Adult. Chili. Presented by Charles Darwin, Esq. 

 e. Young. Chili. With no large but equal small scales under 



the orbit. Presented by Charles Darwin, Esq. 



b. Scales of back small, of tail larger, whorled. 



46. Tropidurus, part, Schinz. Opiums, part, Dum. et Bib. 



Uromastyx, Nieuwied. 



Head triangular, short, thick, covered with moderate-sized 

 plates; interparietal plate moderate, oblong. Eyebrow-scales 

 small, many-rowed. Nostrils lateral, tubular. Nape-crest formed 

 of conical tubercles. Throat lax, with 2 folds behind, and a plait 

 in front of the shoulders. The ear small, rather tubercular in 

 front. Body depressed. Back not crested. Scales of the back 

 smooth, convex, transverse, rhomboidal, not imbricate, of the sides 

 rather smaller. Tail conical, tapering, with rings of large spinose 

 scales Cheek-scales 2-rowed. 



The False Quetz Pale a. Tropidurus cyclurus. Uromas- 

 tix cyclurus, Wied. N. Act. Nat. Cur. xiv. 127, t. 15. Tropidurus 

 torquatus, Schinz, Rept. 90, t. 29, f. 1. O. Maximiliana, Dum. 

 et Bib. E. G. iv. 365. 



Scales of the back convex, smooth ; the front edge of the ear 

 not toothed; olive, with a black angular band across the shoulders. 

 Inhab. Brazils. Mus. Paris. 



47. Uranocentron, Kawp., Wagler, Weigm. Uromastyx, part, 

 Merrem. Doryphorus, Cuvier. 



Head short, triangular, flat in front, with many nearly square, 

 small, polygonal scales, and a large interparietal plate. Palate 

 toothless. Nasal plates nearly lateral, swollen. Throat with a 

 double plait. Ears not toothed. Body short, depressed, lougitu- 

 dinally folded on the sides, with small, imbricate, smooth scales, 

 and no dorsal crest. Tail rather elongate, broad, flat, surrounded 

 with whorls of large spinous scales. Femoral pores Done. 



