28. UEANISCODON. 179 



Plica, Gratf, Griff. A. K. ix. Si/n. p. 40, and Cat. Liz. p. 223. 

 Uperauodon, Dion. Sf Bihr. p. 247 ; Fitzing. I, c. 

 Ptychosaiirus, Fitzing. I. c. p. 59. 

 Ptychopleura, Fitzing. I. c. 

 Uraniscodon, Gray, Cat. p. 222. 



Tympanum distinct. Body subcylindrical or depressed; a slightly 

 serrated dorsal ridge ; dorsal scales small, imbricate, uniform. Upper 

 head-scales enlarged, occipital very largo. Neck strongly plicate 

 interiorly, the folds forming a pair of pouches on each side; no 

 gular sac. Digits compressed, bent at the articulations, with keeled 

 lamelhe inferiorly. No femoral or prrcanal pores. Tail long, C3'lin.- 

 drical or compressed. Lateral teeth tricuspid, the anterior ones 

 slightly enlarged and canine-like ; pterygoid teeth present or absent. 

 A large sternal fontanelle. No abdominal ribs. 



South America. 



1. Uraniscodon umbra. 



Uraniscodon umbra, Gray, Cat. p. 222. 



pictuin, part., Gray, I. c. p. 223. 



Lacerta umbx'a, Linn. S. N. i. p. 3G7. 



Agama picta, Wied, Ahhild. 



Loph\Tus ochrocollaris, t^ipix, Spec. Nov. Lacert. Bras. p. 10, pi, xil. 



iig.;2. 



Uraniscodon umbra, Kaitp, Zsis, 1826, p. 90. 



pictum, Kaxp, I. c. 



Hypsibatus umbra, Wagl. Syst. Amph. p. 1.50. 

 Uperanodou ochrocoUare, Dum. 4'- Bihr. iv. p. 248. 



pictum, part., Dum. Sf Bihr. p. 251. 



Ilyperauodon peltigerus, Cope, Joiirn. Ac. Philad. (2) viii. 1876, 



'p. 170. 

 umbra, Peters, Mon. Bed. Ac. 1877, pp. 408, 413. 



Snout short and very broadly rounded ; nostril small, turned up- 

 wards; upper head-scales usually with small granular asperities; 

 anterior supraorbital scales transversely dilated, forming two di- 

 verging series ; a series of large transverse supraoculars ; occipital 

 broader than long, as broad as or broader than the supraocular 

 region ; labials large, four or five upper and five or six lower ; ear- 

 opening large, its anterior border not or but very slightly denticu- 

 lated, A strong oblique antehumeral fold ; a feeble longitudinal 

 and a strong transverse gular fold, the latter forming a small pouch 

 on each side ; sides of neck feebly plicate, without spines. ])orsal 

 crest most developed on the nape, reduced to a very slight ridge on 

 the back. Body not depressed ; dorsal scales as large as or a little 

 larger than ventrals, rhomboidal, keeled, the keels forming olilique 

 lines ; ventrals rhomboidal, more or less distinctly keeled or shortly 

 mueronate. The size of the scales varies considerably. The ad- 

 prcssed hind limb reaches the car or the eye. Tail round or slightly 

 compressed, slender, at least twice as long as head and body, lled- 

 dish or purplish brown above, with more or less distinct blackish 

 cross bands ; a broad black band on the antehumeral fold, sometimes 



n2 



