ACANTHOSAtJRA. 125 



B. Nuchal and dorsal crests continuous. 



a. A spine on each side of neck A. minor, p. 127. 



b. No spine on side of neck. 



a'. Dorsal scales not very unequal in size . . A. kakhienensis, p. 127. 



b'. Dorsal scales very unequal in size A. major, p. 128. 



c'. A serrated ridge on each side of the neck, 



parallel with the nuchal ridge A. tricarinata, p. 129. 



181. Acanthosaura armata. 



Agama armata, Gray, Zool. Journ. iii, 1827, p. 210. 

 Acanthosaura armata, Gilnth. Rept. B. 1, p. 148; Theob. Cat. 

 p. 112 (?) ; Bouleng. Cat. Liz. i, p. 301, pi. xxii, fig. 1. 



Snout as long as the diameter of the orbit, or slightly shorter ; 

 canthus rostralis and supraciliary edge angular ; tympanum nearly 

 as large as the eye-opening ; upper head-scales keeled, much larger 

 on the supraorbital region ; a long spine, measuring from three 

 fourths to one diameter of the orbit, terminates the supraciliary 

 edge; 11 to 13 upper and 13 to 15 lower labials ; gular scales 

 strongly keeled, much smaller than the ventrals. An oblique 

 fold on each side of the neck, in front of the shoulder ; a large 

 spine, of the same size as the postorbital, on each side of the nape 

 above the tympauum. Nuchal crest not continuous with the 

 dorsal, composed of large compressed spines, as long as the post- 

 orbital ones, with the base concealed by two or three rows of 

 smaller spines. Dorsal crest anteriorly as high as the nuchal, be- 

 coming very low behind. Dorsal scales extremely small, all with 

 the points directed upwards, intermixed with irregularly scattered, 

 enlarged, rhomboidal, strongly keeled scales ; ventral scales a 

 little larger than the enlarged dorsals, strongly keeled. Fore limb 

 and tibia above with equal keeled scales, femur with unequal ones; 

 fourth finger very slightly longer than third ; the hind limb 

 stretched forwards reaches between the temple and the nostril. 

 Tail compressed, 1^ to 14 times as long as head and bodv, covered 

 with uniform strongly keeled scales, which are larger beneath. 

 Brownish above, with round lighter spots, or light with irregular 

 dark spots ; some dark lines radiate from the eye ; an oblique dark 

 brown band down each side of the neck, from the interruption 

 between the nuchal and dorsal crests to the throat. 



From snout to vent 5-4 inches ; tail 6*25. 



Hob. Teiiasserim (?), Malay Peninsula, Siam, Cochin China. 



132. Acanthosaura crucigera. 

 Acanthosaura crucigera, Boukng. Cat. Liz. i, p. 302. pi. xxii, tig. 2. 



Snout as long as diameter of orbit ; cauthus rostralis and supra- 

 ciliary edge angular ; tympanum smaller than eye-opening ; upper 

 head-scales rather feebly keeled, much larger on the supraorbital 



