208 Laeertidse. 



corner of the eye and the tjmpanum, its length 3-J to 4 times in 

 length to vent in males, 3f to 4i times in females ; snout obtusely 

 pointed, with sharp canthus and concave loreal region, as long as the 

 postocular part of the head ; a lanceolate concavity on the upper 

 surface of the snout, extending on the frontal shield ; a sharp keel 

 below the eye, on the freno-ocular and subocular shields. Pileus 2 to 

 2J times as long as broad Neck as broad as the head. The hind 

 limb reaches the ear or between the shoulder and the ear in male.s, the 

 •elbow, the axil, or the shoulder in females ; foot 1^^ to 1|- times as 

 long as the head ; digits feebly compressed. Tail \^ to 2 J times as 

 long as head and body. 



Upper head-shields smooth ; nostril pierced between 2, 3, or 4 

 shields '■'• ; nasals usually forming a short suture behind the rostral, 

 rarely narrowly separated t; frontonasal broader than long; pre- 

 frontals as long as broad or a little longer than broad, forming an 

 extensive median suture ; frontal 1^ to 2 times as long as broad, as 

 long as or a little longer than its distance from the end of the snout, 

 much narrowei- behind than in front, the lateral borders concave; 

 parietals a little longer than broad ; interparietal small or very small, 

 •often followed by a second small shield % -. occipital very small and 

 widely separated fjom the interparietal, or absent. 4 supraoculars, 

 first small and usually in contact with the frontal, second longer than 

 the third, fourth small but usually larger than tlie first ; 4 super- 

 uiliaries, rarely 5, second much longer than the others, all in contact 

 with the supraoculars ; sometimes 1, 2, or 3 granules between them § ; 

 Two superposed postnasals, rarely one ; anterior loreal shorter than 

 the second ; 4 || upper labials anterior to the subocular, which is much 

 narrower beneath than above and borders the mouth. Two large 

 upper temporals, anterior the longer and usually in contact with the 

 fourth supraocular ; temporal scales small, .smooth or feeblv keeled ; 

 a large, opercle-like tympanic shield.^ 



6, rarely 6,** pairs of chin-shields, the 3, rarely 2, anterior in contact 

 in the middle ; guiar scales largn, flat, imbricate towards the collar, 

 which is very indistinct, except at the sides, and composed of 6 to 10 



* Between two shields, followed by two superposed postnasals, in 14 specimens ; 

 between four shields (two nasals and two postnasals) in 22; between three 

 .(there being only one postnasal) in 3. 



t Male from Tafrent, male from Tunis (Paris Museum). 



X Which is rarely in contact with the occipital. 



§ 5-3 in a male from Batna; 4-6 in a female from Tunis (Paris :JIu,seum). 



II Exceptionally 5, according to Doumergue. 



If Divided into two in a male from Batna. 



** Female from Portes-defer. 5-6 in a male from Tunis (Paris Museum). 



