338 AGAMIB^. 



2. Scales on the vertebral region equal, or forming longitu- 

 dinal series. 



a. Ventral scales not much smaller than the largest dorsals. 



a. Nostril pierced on the can thus 



rostralis ; tail compressed . . 30. annectens, p. 360. 



/3. Nostril pierced below the canthus rostralis ; tail not 

 compressed. 

 The largest caudal scales scarcely larger 



than the largest dorsals 31. stoliczJcana, p. 360. 



Dorsal scales keeled; upper head-scales 



smooth or feebly keeled 32. tuberculata, p. 361. 



Dorsal scales keeled; upper head-scales 



sharply keeled 33. dayana, p. 362. 



Dorsal scales smooth or very feebly keeled 34. himalayana,Tp.S62. 



b. Ventral scales not more than half the size of the largest 



dorsals. 

 Upper head-scales keeled ; dorsal scales 



sharply keeled ; flanks with enlarged 



scales 35. agrorensis, p. 363. 



Median dorsal scales of unequal width, 



forming regular longitudinal series .... 36. melanura, p. 363. 

 Median dorsal scales equal, forming regular 



longitudinal series; no enlarged scales 



on the flanks 37. Urata, p. 364. 



Dorsal scales large, equal, mucronate, the 



keels forming oblique lines 38. nupta, p. 365. 



B. Tail divided into distinct segments, each composed of two 

 whorls of scales. 

 Scales on upper surface of tail not larger 



than those on upper surface of tibia; 



more than 200 scales round the middle 



of the body ; gular scales smooth 39. microlepis, p. 366. 



Scales on upper surface of tail not larger 



than those on upper surface of tibia ; not 



more than 160 scales round the middle of 



the body ; gular scales smooth 40. caucasica, p. 367. 



Scales on upper surface of tail larger than 



those on the tibia, strongly spinose; 



gular scales strongly keeled 41. stellio, p. 368. 



1. Agama mutabilis. 



Trapelus sinaitus (non Heyd.), Gray, p. 259. 

 Geoffroy, Descr. Egypte, p. 127, pi. v. tigs. 8, 4. 

 Agama mutabilis, Merr. Tent. p. 50. 

 Trapelus mutabilis, Kaup, lais, 1827, p. 617. 

 Ajrama arenaria, Heyden, in Rilpp. Atlas N. Afr., Bept. p. 12. 

 Eremioplanis aegyptiaca, Fitdng. Syst. Kept. p. 82. 



