182 IGUANIDZ. 
back tectiform. Dorsal scales larger than ventrals, rhomboidal, im- 
bricate, keeled, the keels obliquely converging towards the vertebral 
line; ventrals smooth. Digits slender. The adpressed hind limb 
reaches the ear. Tail as long as head and body, conical, strongly 
depressed at the base, covered with very large rhomboidal spinose 
scales. Greenish above, tail yellowish olive; head with symmetri- 
cal black markings ; a crescentic black band across scapular region, 
and sometimes a second across the nape; lower surfaces greenish 
white. 
millim. millim 
Total length........ 114 Fore limb ...... 29 
CAG odie! sues astrscan Fi 16 Hind limb ...... 38 
Width of head...... 12 EA acres cpaneies eens 57 
Bod iis. esha wanes 41 
Brazil 
ad. Bahia. Dr. Wucherer a 
bo, Ad., stuffed, Bahia. M. de Castelnau [P.]. 
ce, Ad., stuffed, Brazil. Mrs. Parker [P.]. 
30. UROCENTRON. 
Urocentron, Kaup, Isis, 1827, p. 612; Wagler, Syst. Amph. p. 145; 
Wiegm, Herp. Mex. p. 18; Fitzing. Syst. Rept. p. 77. 
Doryphorus, Cuv. R. A. 2nd ed. ii. p. 84; Dum. § Bibr. iv. p. 869. 
Uranocentron, Gray, Cat. Liz. p. 225. 
Tympanum distinct. Body depressed; no dorsal crest; dorsal 
scales small, imbricate, uniform. Upper head-seales little enlarged. 
Two transverse gular folds; no gular pouch. Digits compressed, 
bent at the articulations, with keeled lamelle inferiorly. No femoral 
or preanal pores. Tail short, flat, with whorls of spinose scales. 
Lateral teeth tricuspid ; no pterygoid teeth, A large sternal fonta- 
nelle. No abdominal ribs. 
South America. 
1. Urocentron azureum. 
Uranocentron azureum, Gray, Cat. p. 226. 
Lacerta azurea, Linn. S. N. i. p. 862. 
Stellio azureus, Daud. Rept. iv. p. 36, pl. xlvi. 
brevicaudatus, Daud. J. c. p. 40, pl. xlvii. 
Uromastyx cxruleus, Merr. Tent. p. 56. 
azureus, Mer. l.c. p. 57. 
Urocentron azureum, Kaup, Isis, 1827, p. 612. 
Ophyessa (Uranocentron) azureus, Gray, Griff. A. K. ix. Syn. p. 42. 
( ) brevicaudatus, Gray, J. ¢. 
Doryphorus brevicaudatus, Guér. Icon. R. A., Rept. pl. vi. fig. 3. 
Urocentron brevicaudatum, Wiegm. Herp. Mex. p. 18. 
Doryphorus azureus, Dum. & Bibr, iv. p. 371, pl. xlii. fig. 2. 
