20'. PHRrNOCBPHALTJS. 375 



Fore limb 24 millim. 



Hiad limb 36 „ 



TaU 54 „ 



The younger specimen measures — from snout to vent 37 miUim., 

 tail 47 millim. 

 Mongolia. 



a-b. 5 & hgr. Desert Gobi. J. Brenchley, Esq. [P.]. 



6. Phrynocephalus frontalis 



* 



PhrynocepbaJus frontalis, Strauoh, Vay. Przewalski, Sept. p. 15, 

 pi. iii. flg. 1. 



Forehead sloping, suboonvex, with enlarged convex scales ; nostril 

 anterior, scarcely turned upwards ; nasal separated from its fellow by 

 three or four longitudinal series of scales. Dorsal scales homogeneous, 

 subimbricate, larger and more or less distinctly keeled on the verte- 

 bral region, decreasing in size to the sides, where they are convex 

 or tectiform. Gular and abdominal scales smooth, pectorals strongly 

 keeled. Third and fourth toes distinctly fringed on the outer side. 

 Tibia as long as the skuU. Tail long, little thickened at the base, 

 gradually tapering, everywhere slightly depressed, the end curling 

 upwards, covered with keeled scales. Brown above, irregularly 

 guttate with yeUow, uniform yellowish inferiorly ; a slightly arched 

 praeocular transverse blackish band ; two series of blackish spots on 

 the back, sometimes confluent and forming transverse bands ; end of 

 tail black inferiorly. 



Total length 116 millim. 



Head and neck 16 ,, 



Body 38 „ 



Tail 62 „ 



Chinese Province Ordos. 



7. Phrynocephalus caudivolvulus. 



Phrynocephalus caudivolvulus, Grai/, Cat. p. 260. 

 Lacerta caudivolvula, Pall. Zoogr. JRoss.-As. iii. p. 27. 

 Agama guttata, Baud. Mept. iii. p. 426. 



caudivolvula, Lichtenst. in Eversm. Reise, p. 143. 



oceUata, Lichtenst. I. o. 



Phrynocephalus caudivolvulus, Fitz. N. Classif. Sept. p. 48 ; Eichw. 



Zool. Spec. p. 186, and Faun. Casp. Cauc. p. 107, pi. xii. figs. 6, 7, 



& pi. xiii. figs. 9-14 ; Bum. Sf Bibr. iv. p. 522. 



oceUatus, Eichw. Zool. Spec. p. 186. 



reticulatus, Eichio. I. c. 



tickelii, part., Giinth. Proc. Zool. Soc. 1860, p. 161. 



caudivolvulus, part., Giinth. Sept. Brit. Ind. p. 161. 



Forehead convex and slightly sloping, with moderately enlarged 

 convex scales ; occipital scales either srdaU, scarcely larger than 



* I hare examined two Bpecimens, belonging to M. Lataste, collected by 

 Abb6 David in Mongolia. 



