208 REPTILES. 



II. Back suhtrigonal or depressed. TeiTestrial. 



D, Body suhtrigonal^ covered with large keeled scales, directed oh- 

 liquely toivards the back. Throat with a cross fold or smooth. 

 Toes simple. Tropidolepina. 



a. Femoral pores distinct. Cloacal pores none. 



30. Tropidolepis, Cuv. R. A. Sceloporus, part, Weigmann. 

 Tropidurus, part, Wagler. Uromastyx, part, Merrem. 



The head short, flattened, rounded in front, with small 

 head-shields, a large interparietal and large superorbital shields. 

 Nostril subapical, on each side, just above the face-ridge, open. 

 Throat smooth, with an oblique plait on each side. Palate tooth- 

 less. Cheeks with 2 rows of scales. Body depressed, subtrian 

 gular. Scales imbricate, of the back keeled, of the belly smooth. 

 Back and tail not crested. Tail thick, short, depressed at the 

 base, round and tapering at the end. Femoral pores distinct. 

 Preanal or cloacal pores none. 



* Head-shields smooth. Scales of the back large, not denticulated. 



The Waved Tropidolepis. Tropidolepis undulatus, Cuv. R. 

 A. ii. 38. Gray, Griffith, A. K. ix. 43. Dum. et Bib. E. G. iv. 

 298. Hollhrook, N. A. Erp. iii. 51, t. 8. Lacerta undulata, Bosc 

 MSS. Latr. R. ii. 40. Baud. R. iii. 884. L. hyacinthina, Green, 

 J. A. N. S. Phil. i. 349, (male). L. fasciata, Green, I. c. i. 349, 

 (female). 



Greenish or reddish bronze, wdth black cross bands ; the head- 

 shields smooth ; scales of the back large, rhombic, entire-edged ; 

 supraorbital shields 5, many-sided, with scales externally ; inter- 

 parietal plate large, oblong or subcordate. 



a — c. Adult, in spirits. North America. Presented by Jacob 



Green, M.D. 

 d, e. Adult and young, in spirits. N. America. Presented by 



Edw. Doubleday, Esq. 



** Head-shields smooth. Scales of the back large, toothed. 



The Collared Tropidolepis. Tropidolepis torquatus. Gray, 

 Griffith, A. K. ix. 43. Zool. Beechey, Voy. 95, t. 30,/. 2. Dian. et 

 Bib. E. G. iv. 301. Agaraa torquata, Green and Peale, J. Acad. 

 N. S. Phil. ii. 231. Weigm. H. Mex. 49, t. 7,/. 1. Gravenh. Act. 

 N. Cur. xviii. 763, t. 56, f 6 — 12. Tecoixin, Hernand. Mex. 

 36—65. 



Coppery olive, with white or yellow-edged black collar on the 

 shoulders ; scales of the back very broad, rhombic, blunt, toothed 

 on the edge and keeled, ending in a short straight point; interpa- 

 rietal plate moderate, subcordate ; chin-shields b-o. 



a. In spirits. Mexico. Presented by J. E. Gray, Esq. 



