20. PHRrxuCEPHALUS. 379 



pointed, smooth or feebly keeled ; pectoral and ventral scales mu- 

 cronate, the former smooth or feebly keeled, the latter smooth. 

 Scales on limbs smooth or keeled ; a more or less distinct fringe of 

 pointed scales borders the thighs posteriorly. Tibia longer than the 

 skull. Toes very long, the third and fourth on both sides with a 

 very strong fringe of acute lobules. Tail depressed, tapering to a 

 fine point, covered with keeled scales ; its length equals once and a 

 half to once and two thirds the distance from gular fold to vent. 

 Sandy-grey above, dotted and vermiculated with blackish, and dotted 

 with while ; lower surfaces white ; end of tail inferiorly black, with 

 two to four black spots in front. 



Total length 77 millim. 



Head 8 



Width of head 8 



Body 28 



Fore limb 19 



Hind limb 34 



Tail 41 



Eastern borders of the Caspian Sea. 



a-c. c? 2 • Tschelekan Island. St. Petersbui-g Museum. 



d. Many spec. Krasnowodsk. St. Petersburg Museum. 



13. Phrynocephalus mystaceus. 



Megalochilus auritus, Gray, Cat. p. 261. 

 Lacerta mystacea, Pallas, Reise, iii. p. 702. 



aurita, Pall. Zoogr. Ross.- As. iii. p. 21. 



lobata, Shaw, Zool. iii. p. 244. 



Gecko auritus, Latr. Kept, ii. p. 61. 



Agama aurita, Daud. Rept. iii. p. 429, pi. xlv. fig. 2 ; Licht. in 



JEversm. Reise, p. 142. 



mystacea, Merr. Tent. p. 63. 



Phrynocephalus auritus, Fitz. N. Class, p. 47 ; Eversm. Nouv. M4m. 



Soc. Mosc. iii. 1834, p. 300 ; Dum. ^ Bihr. iv. p. 524, pi. xl. fig. 1 ; 



Schreih. Herp. Eur. p. 460. 



mystaceus, Kaup, Isis, 1827, p. 614. 



Megalochilus auritus, Eichw. Zool. Spec. iii. p. 185. 



Forehead convex, with enlarged tectiform or striated scales; 

 occipital scales rather small ; supraorbital scales smaD, keeled ; 

 nostril directed forwards and upwards ; nasal separated from its 

 fellow by one or three series of scales ; sides of the head withspine- 

 Uke projecting scales ; a large, fringed, folded lobe of skin at the 

 angle of the mouth. Dorsal scales small, not enlarged on the 

 vertebral region, rhomboidal, imbricate, keeled, intermixed with 

 more or less scantily scattered enlarged scales of similar shape. 

 Gular scales keeled ; pectoral and ventral scales mucronate, the 

 former strongly, the latter feebly keeled. Scales on upper surface 

 of limbs keeled. Tibia longer than the skull. Third and fourth 

 digits of both pair of limbs very strongly fringed on each side. 



