100 Lacertidas. 



Upper caudal scales very oblique and diagonally keeled, those at the 

 base nearly as long as broad, usually strongly, sometimes feebly 

 keeled, lower smooth or feebly keeled in the basal part of the tail ; 

 one or two series of small scales usually present on the mid-dorsal 

 line of the basal part of the tail ; 24 to 36 scales in the fourth or fifth 

 whorl. 



Greyish above, with a darker reticulation, or with numerous small 

 round whitish dark-edged spots, or with small blackish dots or 

 vermicular linos sometimes forming wavy transverse lines ; lower parts 

 white, the throat sometimes bluish gi'ey ; tail often with a lateral 

 sei'ies of blackish spots. Some specimens of a yellowish-grey sand- 

 colour with the markings very indistinct. Young grey above, with 

 numerous round white spots, and two white streaks along each side of 

 the body and a dark streak aloiig each side of the tail, which is bluish 

 at the end. 



Measurements (in millimetres) : 



Salah. 5. 9 , Cairo. 6. $ , Fayum. 



Hahitat. — Long known from Egypt, the Sinaitic Peninsula and 

 Palestine, this form has recently been discovered by Dr. C. Christy in 

 Mesopotamia at Basra and by Dr. E. Hartert in the Algerian Sahara, 

 at In Salah, the southernmost point at which zoological collections 

 have been made. 



Var. LONGIPES, Boulenger. 



A form remarkable for its long and slender hind liml)s and its very 

 small scales occurs in the interior of the Algerian Sahara along with 

 the var. inornafu^. 



Head as in the typical form. Hind limb (males) reaching the eye 

 or between the ear and the eye ; foot 1 }. to 1 .} times as long as the 

 head, fourth toe ll to 1.', times. First supraocular entire in the three 

 specimens from Wargla and in the one from El Wed, with one or two 



