19. AOAiiA. 355 



23. Agama spinosa. 



Agama colonorum (non D. 8f B.), Gray, Cat. p. 256. 

 Agama spinosa, Gray, Griff". A. K. ix., Syn. p. o7. 



colonorum, Riijypell, N. Wirbelth. Faun. Abyss, p. 14, pi. iv ; 



Blanf. Zool. Abyss, p. 449. 



Head small, rather depressed. Nostril tubular, directed upwards 

 and backwards, pierced in the posterior part of a small nasal on the 

 canthus rostralis. Upper head-scales smooth ; generally no elongate 

 scale on the snout ; occipital enlarged ; sides of head near the ear, 

 and neck with groups of rather long spines, the largest of which 

 measure more than half the diameter of the ear-opening; latter 

 large, exposed, larger than the eye-opening. Throat much plicate ; 

 no regular gular pouch. Body not much depressed, covered above 

 with rather large rhomboidal mucronate imbricate scales, with 

 strong keels converging towards the vertebral line ; these dorsal 

 scales, smaller than the caudals, number forty to fifty from the origin 

 of the fore limbs to the origin of the hind Hmbs (counting on the 

 vertebral line); a distinct nuchal crest composed of rather long 

 spines ; no dorsal crest ; ventral scales much smaller than the dorsals, 

 smooth ; sixty to seventy-four scales round the middle of the body. 

 Limbs long and strong, digits elongate ; tibia longer than the skull 

 (to occiput) : third and fourth fingers equal ; fourth toe slightly longer 

 than third, fifth extending beyond first. Tail twice and a half as long 

 as the distance from gular fold to vent, roundish in the female, 

 compressed and keeled above in the male, covered with large strongly 

 keeled scales forming rather distinct annuli. Male with a row of 

 anal pores. Olive-brown above ; lower surfaces yellowish, with a 

 well-marked black collar ; the middle of the throat orange-red in 

 the male. 



Total length 310 millim. 



Head 23 „ 



Width of head 22 „ 



Body 87 „ 



Fore limb 54 „ 



Hind limb 75 ,, 



Tail 200 ,, 



North-east Africa ; Arabia. 



a. S- I^gypt- ^ij" J- G^- Wilkinson [P.]" 



6,c. c? $ . Egypt- J- Burton, Esq. [P.]. 



d. ^ . Rairo Habab, Abyssinia. W. T. Blanford, Esq. [P.]. 



e-f. cJ. Mt. Sinai. 



24. Agama rueppellii. 

 Agama ruppelli, Vaillant, in JRevoil, Faun. Somalia, Bept. p. 6, pi. i. 



Distinguished from A. colonorum by the shorter, more globulose 

 head, the longer spines on the back of the head and neck, which 

 partly conceal the ear-opening, and the larger dorsal scales, the size 



2a2 



