2 Lacertidae. 



however, the tubercles form obtuse keels, and iu a female of P. neumanni 

 there is a rather sharp keel along the middle. Steindachner has 

 already observed that of the two types of P. hardeggeri one has the 

 subdigital lamellae distinctly keeled, whilst in the other the keels are 

 scarcely indicated. 



The species grouped under this genus thus afford another argument 

 against the unnatural division of the Lacertidae into two main 

 groups, Liodadyli and Prisiidacfyli, according to the absence or 

 presence of keels on the lower surface of the digits, which the state 

 of things in Psammodronms and Scaj'tira had already led me to 

 abandon. 



Synopsis of the Species, 



I. Dorsal plates smooth or very feebly keeled ; interparietal usually absent or 

 separated from the occipital by the parietals meeting in the middle ; 

 usually 4 upper labials anterior to the subocular ; 11 to 15 femoral pores 

 on each side. 



30 to 46 dorsal plates and scales across the middle of the body ; 

 liind limb not reaching the ear ; foot Ij to li times length of 

 head ........ P. spinalis, Peters, p. 3. 



'28 or 30 dorsal plates and scales across the middle of the body ; 

 hind limb reaching the ear ; foot If times length of head. 



P. phillipsii, Blgr., p. 5. 

 II. Dorsal plates more or less strongly, rarely feebly keeled ; interparietal 

 in contact with the occipital or separated from it by a small shield ; 

 usually 5 upper labials anterior to the subocular. 



38 to 42 dorsal plates and scales across the middle of the body ; 

 12 to 14 large keeled scales in a transverse series between 

 the hind limbs ; supraoculars in contact with the frontal ; 

 29 to 34 gular scales in a longitudinal series ; 14 to 16 

 femoral pores on each side ; 33 to 35 lamellar scales under 

 the fourth toe P. nettmanjii, Matsch., p. 7. 



33 to 40 dorsal plates and scales across the middle of the body ; 

 12 to 18 large keeled scales in a transverse series between 

 the hind limbs ; supraoculars in contact with the frontal ; 

 21 to 28 gular scales in a longitudinal series; 12 to 18 

 femoral pores on each side ; 24 to 30 lamellar scales under 

 the fourth toe ....... P. intermedius, Blgr., p. 9. 



24 to 30 dorsal plates and Scales across the middle of the 

 body ; 8 keeled plates in a transverse series between the 

 hind limbs ; supraoculars usually separated from the frontal 

 by a series of granules ; 25 to 28 gular scales in a longi- 

 tudinal series ; 11 to 13 femoral pores on each side ; 25 to 31 

 lamellar scales under the fourth toe . . P. Jiardeggeri, Stdi-., p. 12. 



