LTEIOCEPHALTIS. 



121 



Genus LYRIOCEPHALUS, 



Merrem, Teat. Syst. Ampb. p. 49, 1820. 



Tympanum hidden. Body compressed, covered ^vitll small scales 

 intermixed with enlarged ones. A nuchal and a dorsal crest. A 

 gular sac and a V-shaped gular fold, xldult with a glohular hump 

 on the nose. ]Vo femoral or praeanal pores. 



Prse- and post-orbital bones forming an arch limiting a supra- 

 orbital fossa. 



Distributmi. Ceylon. 



Fig. 41. — Skull of Lyrioccphahis sctitaitis, upper and side views. 



126. Lyriocephalus scutatus. 



Ijacerta sentata, Linn. Si/sf. Kaf. i, p. 300. 



Lviiocephalus scutatus, Kelaart, Prodr. p. 166 ; Gi'mth. Rept. B. I. 



'p. 128 ; rheoh. Cat. p. 99 ; Boideny. Cat. Liz. i, p. 281. 

 Lyriocephalus macgregorii, Gray, 111. Lid. Zool.u, pi. Ixviii, fig. 1. 



Eostral hump large and globular in the adult, absent in the 

 young, covered with subequal smooth scales ; canthus rostralis 

 and supraciliary edge sharp, projecting, the latter ending behind 

 in a triangular compressed spine ; a pair of small spines on the 

 occiput ; upper head-scales irregular, vuiequal, feebly keeled ; 

 temple granular, with enlarged tubercles ; 14 or 15 upper and as 

 many lower labials. Gular sac large in the male, small in the 

 female ; gular scales larger than ventrals, keeled, those on the gular 

 sac separated by granules. Body strongly compressed. A low 

 nuchal crest, formed of a cutaneous fold with small triangular 

 scales forming a denticulation. Dorsal crest composed of small 

 triangular compressed tubercles, separated from one another. Dor- 

 sal scales very small, smooth, intermixed with flat, smooth or feebly 

 keeled tubercles which, on the nape, and sometimes also on the 

 back, form regular longitudinal s(n'ies ; these tubercles irregularly 



