LTBIOCEFHAIT7S. 



Genus LYRIOCEPHALUS, 



121 



Merrem, Tent. Syst. Amph. p. 49, 1820. 



Tympanum hidden. Body compressed, covered with small scales 

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

 gular sac and a V-shaped gular fold. Adult with a globular hump 

 on the nose. ?so femoral or pra?anal pores. 



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

 orbital fossa. 



Distribution. Geylon. 



Fig. 41. Skull of Lyriocephalus scafattif, upper and side views. 



126. Lyriocephalus scutatus. 



Lacerta scutata, Linn. Syst. Nat. i, p. 360. 



Lyriocephalus scutatus, Kelaart, Prodr. p. 166 ; Giinth. Sept. B. I. 



p. 128 ; Theob. Cat. p. 99 ; Bouleng. Cat. Liz. i, p. 281. 

 Lyriocephalus macgregorii, Gray, III. 2nd. Zool. ii, 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, unequal, 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 series ; these tubercles irregularly 



