21. AMPHIBOLUKUS. 383 



Habit slender. Head moderately large ; snout slightly longer 

 than the diameter of the orbit; canthus rostralis swollen, not 

 angular ; nostril distinctly tubular, directed slightly upwards, much 

 nearer the eye than the end of the snout ; tympanum large, three 

 fifths the diameter of the orbit ; upper head-scales tubercular, rough, 

 smallest on supraorbital region. Sides of neck rather strongly 

 plicate ; a distinct dorso-lateral fold. Gular scales minute, smooth. 

 Body much depressed, covered above with small keeled scales, largest 

 and uniform on the vertebral region, minute and intermixed with 

 widely scattered slightly enlarged ones on the sides ; no dorsal 

 crest; ventral scales small, smooth. Limbs and digits long, the 

 adpressed hind limb reaching the tip of the snout ; the scales on the 

 limbs strongly keeled, those on the arm and tibia much enlarged. 

 A series of sixty pores extending along the whole length of the 

 thighs, slightly interrupted on the praeanal region. Tail slender, 

 round, depressed at the base ; twice as long as head and body ; 

 caudal scales equal, much larger than dorsals, strongly keeled. 

 Black above ; a series of large irregular yellowish spots along the 

 vertebral line and a few very small ones scattered on the sides ; 

 limbs and tail with yellowish cross bars ; throat punctate with 

 blackish ; a large black spot covers the chest. 



Total length 264 millim. 



Head 23 „ 



Width of head 18 „ 



Body 63 ,, 



Fore limb 39 „ 



Hind limb 77 „ 



Tail 178 „ 



West Australia. 



a. (S . West Australia. ' (Type.) 



4. Amphibolurus cristatus. (Plate XXIX. fig. 1.) 



Grammatophora cristata, Grai/, Cat. p. 251. 

 Grammatophora cristata, Gy-ay, in Grey's Trav. Austr. ii. p. 439. 



Habit slender. Head moderately large ; snout as long as the 

 diameter of the orbit, with subangular canthus rostralis ; nostril a 

 little nearer the eye than the end of the snout ; tympanum large, 

 measuring three fourths the diameter of the orbit ; upper head-scales 

 subequal, strongly keeled ; a few small spines on the back of the 

 head. Sides of neck strongly plicate ; a distinct dorso-lateral fold. 

 Gular scales smaller than ventrals, very feebly keeled. Body much 

 depressed, covered above with small keeled scales, largest and more 

 strongly keeled on the middle of the back, minute on the sides, all 

 intermixed with scattered enlarged scales, which are spine-like on 

 the dorso-lateral fold ; a well-developed nuchal crest composed of a 

 few widely separated compressed spines ; a serrated ridge, or crest, 



