AJSfD BATEACHIANS OF BAEBAET. 117 



1. Agama, Daudin, 1802. 



Tail round or feebly compressed. No femoral pores ; males with callose praeanal 

 scales. 



Of this African and South-west Asian genus three species occur in Barbary : — 



A. Third toe much shorter than fourth, fifth not extending as far as first ; occipital 

 . scale not enlarged ; ear-opening smaller than eye-opening. 



Dorsal scales unequal ; head not or but slightly longer than broad ; tail cylin- 

 drical ; male without gidar pouch ] . inermis. 



Dorsal scales equal ; head longer than broad ; tail compressed ; mal"; with a 



large gular pouch 3. tournevillii. 



B. Third and fourth toes equal, fifth extending beyond first ; occipital considerably 



larger than the sun'ounding scales ; ear-opening larger than the eye-opening . 3. bibronii. 



1. Agama inekmis, Eeuss, 1834. 

 A. agilis, Eichwald, Strauch. — A. ruderata, Strauch. — A. mutabilis, Lataste. 



Head very short, not or but slightly longer than broad. Nostril directed upwards 

 and backwards, pierced on the canthus rostralis in the posterior part of a fiat nasal. 

 Upper head-scales convex, smooth or very slightly keeled ; occipital not enlarged ; 

 usually a few scattered small spinose scales on the back of the head ; a fringe of small 

 spinose scales on the upper edge of the ear, which is smaller than the eye-opening. 

 Male without, or with only an indication of, a gular pouch. Body depressed, covered 

 above with unequal, rhomboidal, imbricate, keeled, more or less mucronate scales ; 

 ventral scales smooth or feebly keeled. Limbs moderate ; tibia as long as the skull, or 

 a little shorter ; third finger shorter than fourth, fifth not extending as far as second ; 

 third toe much shorter than fourth, fifth not extending as far as first. Tail about twice 

 as long as the distance from gular fold to vent, rounded, covered with equal keeled 

 scales. Male with a double row of anal pores. Grey-brown or sandy coloured above, 

 with or without more or less distinct quadrangular dark grey, brown, or reddish spots 

 arranged symmetrically on the back ; some of the larger scales may be lighter; lower 

 parts white ; the breeding male's throat with blue longitudinal lines, or blue with 

 white spots. 



From snout to vent 90 millim., tail 130. 



This species varies considerably in the scaling of the back, a large series of specimens 

 showing almost every transition between a nearly equal lepidosis and one in which the 

 enlarged scales, scattered far apart, are as much as three or four times as large as the 

 others. Such extremes are, however, not of frequent occurrence. 



Numerous specimens were obtained by M. Lataste in the Algerian Sahara at Biskra, 

 Hadjira, Wargla, in the Mzab at Tibremt, Laghouat, Bou-Saada, and on the High 

 Plateaux at Msila ; by Dr. Andre in the district of the Tunisian Chotts ; in Tunisia by 



VOL. XIII. — PART III. No. 4. — October, 1891. t 



