LACERTA MURALIS IN WESTERN EUROPE AND NORTH AFRICA. 401 
The upper parts are greyish olive, in spirit, with a darker lateral band, with or 
without a vertebral series of small blackish spots, or reticulate all over with brown or 
black, the network enclosing roundish pale spots; on the posterior part of the back 
the dark markings may form wavy transverse bands; the head is sometimes uniform 
olive-brown above, sometimes much spotted with black; the lower parts are unspotted, 
or with rather small black spots, forming regular longitudinal series along the rows 
of ventral plates. On the whole, as noticed by Eimer, the coloration bears much 
resemblance to that of Z. muralis (typ. and var. brueggemanni) as occurring near Genoa. 
The young is covered with dark and light spots, with a dark lateral band edged above 
and below with whitish. 
According to Eimer, the colour of the back in life is yellowish green or yellow ; the 
belly saffron-yellow or red. 
Measurements :— ee Q. 
From end of snout to vent . 71 57 
fe FF ue fore limb 28 21 
Length of head 17 12 
Depth of head . fal 7 
Fore limb 24 20 
Hind limb . 2) Rend ee 30 
INOYOUS Guivine fof otee ote w ce boy ies SOM mms Ber, ee 18 
tania (Ke produced) i -meemeee en cn een LO, 85 
The Wall-Lizard of Linosa (Pl. XXVIL. fig. 8.), referred by Camerano and myself to 
the typical form, agrees in all essential respects with that from Malta, judging from the 
single specimen at my disposal, received from Prof. Giglioli. It has 68 scales across 
the body, 28 gulars in a longitudinal series, 23 femoral pores on each side, and 34 
lamellar scales under the fourth toe. The belly is spotted with black. 
The following form, from the Filfola Rock, south of Malta, is evidently derived from 
the Maltese lizard, just as the Faraglioni lizard is derived from that living on Capri. 
But while in the latter case the distinction rests entirely upon the darkening of the 
vround-colour—size, scaling, and markings having remained exactly the same,—we here 
find that the melanism is obtained by an invasion of the black markings, and this 
difference is accompanied by an increase in size and, on an average, smaller scales. 
The Filfola form is therefore entitled to the same rank as the var. nigriventris, which 
stands to the typical form exactly in the same relation as the var. ji/folensis does 
to the var. serpa. 
Var. FILFOLENSIS. 
Zootoca lilfordi, part., Giinth. Ann, & Mag. N. H. (4) xiv. 1874, p. 158. 
Lacerta filfolensis Bedriaga, Die Faraglione-Hidechse, p. 19 (1876) ; Braun, Arb. zool. Inst. 
Wiirzb. iv. 1877, p. 49, pl. i. fig. 14; Bedriaga, Arch. f. Nat. 1878, p. 297. 
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