182 



IGITANTD^. 



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. 



niilh'm. 



Total length 114 



Head 16 



Width of head 12 



Body 41 



Brazil. 



a. S- 



b. Ad., stuffed. 



c. Ad., stuffed. 



Babia. 

 Baliia. 

 Brazil. 



millim. 



Fore limb 29 



Hind limb 38 



Tail 57 



Dr. Wiicherer [C.]. 

 M. de Castelnau [P.]. 

 Mrs. Parker [P.]. 



30. UROCENTRON. 



Urocentron, Kaitp, Isis, 1827, p. 612; Wagler, Syst. Amiih. p. 145; 



Wiegm. Herp. Mex. p. 18 ; Fitzing. Syst. liept. p. 77. 

 Doryphorus, Cuv. B. A. 2nd ed. ii. p. 34; Diim. S)- Eihr. iv. p. 369. 

 Urauocentron, Gray, Cat. Liz. p. 225. 



Tympanum distinct. Body depressed ; no dorsal crest ; dorsal 

 scales small, imbricate, uniform. Upper head-scales little enlarged. 

 Two transverse gular folds ; no gular pouch. Digits compressed, 

 bent at the articulations, with keeled lamellte inferiorly. No femoral 

 or prajanal pores. Tail short, flat, with whorls of spinose scales. 

 Lateral teeth tricuspid ; no pterygoid teeth. A large sternal fonta- 

 neUe. No abdominal ribs. 



South America. 



1. Urocentron aznrenm. 



Uranocentron azureum, Gray, Cat. p. 226. 

 Lacerta azurea, Lmn. S. N. i. p. 362. 

 Stellio azureus, Daud. Rept. iv. p. 36, pi. xlvi. 



brevicaudatus, Daud. I. c. p. 40, pi. xlvii. 



Uromastyx cseruleus, Merr. Tent. p. 56. 



azureus, Merr. I. c. p. 57. 



Urocentron azureum, Kaup, Isis, 1827, p. 612. 



Ophyessa (Uranocentron) azureus, Gray, Griff. A. K. ix. <%». p. 42. 



( ) brevicaudatus, Gray, I. c. 



Doryphorus brevicaudatus, Guer. Icon. R. A., Rept. pi. vi. fig. 3. 

 Urocentron brevicaudatum, Tflegm. Herp. Mex. p. 18. 

 Doryphorus azureus, Dum. 8{ Bibr. iv. p. 371, pi. xhi. fig. 2. 



