AND BATEACHIANS OF BAEBAEY. 129 



Four species in Barbary : — 



Posterior dorsal scales very much larger than the anterior, strongly imbricate, 



sharply keeled, passing gradually into the caudals 1. boskianus. 



Ventrals in 14 to 18 longitudinal series, not or but slightly broader than long ; 

 digital denticulations at least as long as the diameter of the corresponding 

 part of the toe 2. scutellatus. 



Ventrals in 12 or 14 longitudinal series, the median broader than long .... 3. pardalis. 



Venti'als in 8 or 10 longitudinal series 4. vulgaris. 



For fuller details upon the Lizards of this genus, cf. Lataste " Les Acanthodactyles de 

 Barbarie et les autres especes du genre," Ann. Mus. Genova, (2) ii. 1885, pp. 476—516. 

 The only important point in which I differ from M. Lataste with regard to the four 

 species of Barbary is his identification of Lacerta savignyi, Audouin (1829), with the 

 species which, from an examination of the types of Lacerta pardalis, Lichtenstein 

 (1823), I call A. pardalis. I identify the figure of the Egyptian L. savignyi with the 

 Lizard from Somaliland described by Lataste as A. vaillanti. 



These Lizards are only found in sandy localities ; they range over the Sahara and 

 the bordering countries as far south as Senegambia and Somaliland, one species ex- 

 tending to the Spanish Peninsula and the south of France. Eastwards they extend 

 through Arabia, Syria, Persia, and Baluchistan to Sind and the Punjab. 



1. AcANTHODACTYLUS BOSKIANUS, Daudin, 1802. 



Snout obtuse. Four supraoculars, the fourth very seldom broken up into small 

 scales ; front edge of the ear usually distinctly denticulated. Dorsal scales strongly 

 keeled, very much larger on the hinder part of the back than between the shoulders 

 and on the flanks, rhomboidal, strongly imbricate. Ventral plates considerably broader 

 than long, in straight longitudinal and transverse series, 10 (rarely 12) across the 

 middle of the body. Digital denticulations strong, usually shorter than the correspond- 

 ing diameter of the toe, much more developed on the outer than on the inner edge of 

 the fourth toe. Young with whitish longitudinal lines separated by blackish inter- 

 spaces with series of round whitish spots ; these markings become more indistinct or 

 disappear with age, the adult being greyish, brownish, or buif, with or without small 

 blackish spots ; lower parts white ; tail of young pink. 



The Algerian specimens belong to the var. asper, Audouin, distinguished from the 

 typical form (hitherto found only in Egypt) by its larger dorsal scales. These scales 

 form 34 to 42 longitudinal series (exclusive of the ventrals) round the middle of the 

 body, and there are 10 to 14 longitudinal rows of large keeled scales between the hind 

 limbs. The subocular does not reach the lip, but is wedged in between the fourth and 

 fifth or fifth and sixth labials. 19 to 24 femoral pores on each side. A median series 

 of broad prseanal plates, posterior largest. 



The largest specimen examined by me measures 80 millim. from snout to vent; tail 

 not quite twice as long. 



