Lacerta. 327 



upper surface of the tibia, and from the two above-uamed by the 

 larger dorsal scales compared to the laterals. Its real aflSnities are 

 doubtful, and it may well be that its resemblance to L. oxycepJiala is 

 a case of parallelism, both species bein*^ independently derived from 

 some more generalised type akin to L. hrandtii. 



•27. LACERTA DUGESII. 



Lacerta dugesii, M.-Edw. Ann. Sc. Nat. xvi, 1829, pp. 71 and 84; 

 Dum. & Bibr. Erp. G6n. v, p. 236 (1839); Godman, Nat. Hist. Azores, 

 p. 43 (1870); Bedriaga, Arch. f. Nat. 1879, p. 330, and Abh. Senck. 

 Ges. xiv, 1886, p. 308; Bouleng. Cat. Liz. iii, p. 35 (1887), and Tr. 

 Zool. Soc. xxi, 1916, p. 81, pi. vii. 



Teira pnnciata, Gray, Ann. N.H. i. 1838, p. 280, and Cat. Liz. 

 p. 33 (1845). 



Lacerta viaderensis, Grirard, U.S. Explor. Exped., Herp. p. 200, 

 pi. xxiv, figs. 1-8 (1858). 



Lacerta punctata, Bouleng. Proc. Zool. Soc. 1881, p. 743. 



Form and general pi'oportions much as in the typical L. muralis. 

 Head l^,- to 1^- times as long as broad, its depth, in the tympanic 

 region, equal to the distance between the anterior corner or the centre 

 of the eye and the anterior border of the tympanum ; snout pointed,* 

 rarely rather obtuse, as long as postocular part of head ; cheeks more 

 or less swollen in the male ; length of pileus It to 2 times its width. 

 Neck at least as broad as head ; body rather strongly depressed. 

 Hind limb reaching the axil, the shoulder, or the collar in the male, 

 the wrist or the axil in the female. Foot usually longer than the head, 

 as long as the head in very large specimens. Tail cylindrical or 

 depressed at the base (elliptic in section), 1 .} to 2 times as long as head 

 and body. 



Nostril between the nasal, the postnasals, and the first upper labial ; 

 rostral nearly always excluded. t Nasals forming a median suture ; 

 prefrontals forming an extensive median suture, unless (very rarely) 

 separated by an azygos shield. Fi-ontal as long as or a little shorter 

 than its distance from the rostral, l.V to If times as long as broad, not 

 or but little narrower behind than in front, bi'oader throughout than 

 the supraoculars. Parietals l.Vto IH times as long as broad, in contact 

 with the upper postocular, outer border straight or convex. Occipital^ 



* Pai'ticularly in specimens from Porto Santo, 

 t E.Kception in one half-grown specimen from Paul, Madeira. 

 X The occipital is absent in one of the type specimens described by Milne- 

 Edwards ; an individual anomaly, as pointed out by Bedriaga. 



