388 MR. G. A. BOULENGER ON THE VARIETIES OF 
that of the var. serpa, as may be seen by a tabulation of the number of scales in 
specimens of the different varieties and local forms :— 
ee 
or 
i. 2: 3. : : 
War. brueggemannt . ... =. . SI-G5 35-52 22-80 17-25 24-28 
Var. nigriventris, Rome. . . . . 5d-71 387-51 22-29 18-23 27-81 
Var. serpa, Rome, Naples . . . . 58-76 38-55 22-381 18-27 28-33 
» Malta . «2. = «| G1=74& “40258 S20=sheeio-e5 “es0=5% 
Var. fifolensis, Filfola . . . . . 68-82 48-62 29-38 18-27 31-36 
1. Number of dorsal scales in a transverse series. 2. Transverse series of dorsal scales 
corresponding to length of head. 3. Number of gular scales in a longitudinal series, 
4. Number of femoral pores. 5. Number of lamellar scales under fourth toe. 
B. Vars. cAMPEstTRIS Betta and serra Raf. 
(Plates X XIE, KOC VIN & XeXeV ie) 
The forms to be described here have frequently been confounded, or grouped 
together under the same general designation, as by Bedriaga (L. muralis neapolitana), 
Camerano (1. serpa), and myself (var. ¢éliguerta). But it is really possible to dis- 
tinguish a northern and a southern form—the former, var. campestris, being more 
sharply differentiated from the typical form, with its vars. drueggemanni and nigri- 
ventris, than the latter. While concentrating their attention on the colour, the 
markings, and the shape of the head, characters far less stable than one would gather 
from their writings, Bedriaga and Kimer have somewhat neglected the lepidosis, 
which, however subject to fluctuations within very wide limits, affords a safer means 
of defining forms. If the lepidosis be taken into consideration, together with the 
other characters, it will be found that, after elimination of the typical form and 
the two varieties into which it gradually transforms from north to south, two further 
varieties can be separated with sufficient precision. If we could put aside the 
more northern of the two latter, the var. campestris, we should feel perfectly 
justified in saying, that the Wall-Lizard passes gradually, at least so far as structural 
characters are concerned, from the typical form in the north to the var. serpa in the 
south, the drift of variation from north to south being in the direction of a larger size, 
a shorter body, smaller scales, longer toes, and smaller scales. But this continuous 
series is broken, or obscured, by the presence, from the plains of North Italy to the 
Roman province, of the var. campestris, which, further south, gradually passes into the 
var. serpa, especially as regards the coloration. 
1 fully agree with Eimer in regarding the striated type of the var. campestris as the 
most primitive of all the Wall-Lizards, and I am quite prepared to admit, so far as 
such speculations based on theoretical conceptions are allowable, that it has given rise, 
or at least is most nearly related, to the form that has become modified into both the 
