11. LTRIOCEPHAIirS. 281 



11. LYRIOCEPHALUS. 



Ljrioceplialus, Merrem, Tent. Syst. Amph. j. 49; Wagler, Syst. 

 Amph. p. 150 ; r/iegm. Herp. Mex. p. 14 ; Bum. 8r Bibr. iv. p. 425 ; 

 Fitzmg. Syst. Rept. p. 44; Gray, Cat. p. 237; aunth. Rept. Brit. 

 Ind. p. 128. 



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. No femoral or prssanal pores. 



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

 orbital fossa. 



Ceylon. 



1. Lyriocephalus scutatas. 



Lyiiocephalus scutatus, Gray, Cat. p. 237. 

 Lacerta scutata, Linn. S. N. i. p. 360; Shaw, Zool. iii. p.' 221, 



pi. Ixviii. 

 Iguana clamosa, Laur. Syn. Mept. p. 49. 

 — — scutata, Latr. Jiept. i. p. 267. 

 Agama scutata, Hand. Rept. iii. p. 845. 

 Lyriocej)halus margaritaceus, Merr. I. c. ; Gu&r. Icon. R. A., Rept. 



pi. Tiii. fig. 2 ; Bum. 8r Bihr. p. 427 ; Buvern. R. A., Rept. pi. xv. 



fig. 2. 

 scutatus, Wagl. I. c. ; Kelaart, Prodr. Fawn. Zeyl. p. 166 ; 



Gunth. Rept. Brit. Ind. p. 128. 

 macgregorii, Gray, lU. Ind. Zool. 



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

 young ; it is 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 granu- 

 lar, with enlarged tubercles ; fourteen or fifteen 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 from one another 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 

 scattered on the flanks. Ventral scales moderate, strongly keeled. 

 Limbs with keeled scales, with enlarged tubercles on the thighs ; 

 the adpressed hind limb reaches the neck or the temple. Tail 

 strongly compressed, with a crest similar to the dorsal : upper 

 caudal scales unequal, feebly keeled, lower equal and strongly 

 keeled ; the length of the tail nearly equals that of the head and 

 body. Greenish above, whitish inferiorly. 



Total length 335 mUlim. 



Head 43 „ 



Width of head 25 „ 



