142 MR, G. A. BOULENGER ON THE 
(striate) are the most primitive, from which first the reticulated (reticulate) and then the 
cross-barred (tigris) were derived; and that the gradual changes have proceeded, first 
in males and then in females, from behind forwards, the tail therefore being in the 
most advanced condition, unless following another independent tendency, viz., the 
suppression of markings (concolores). The Wall-Lizards of the series commencing 
with the typical form and terminating in the var. nigriventris, with the var. bruegge- 
manni as intermediate form, show this very well, and I have therefore on Pl. XVI. 
given side-views of the tails in three specimens (figs. 8-10), showing the passage 
between two extremes :-— 
Fig. 8. Striated female (Bosnia), showing the retention on the tail of the dark 
lateral stripe, with a tendency to break up into spots ; on the reproduced 
part, this lateral stripe has, as usual on the regenerated tails of L. muralis, 
resumed its continuous condition. 
Fig. 9. Reticulated male (Bosnia) with the markings in the form of vertical bars. 
Fig. 10. Male of var. nigriventris (Rome), in which the last condition reaches its 
highest degree in L. muralis, the bars sometimes even forming complete 
annuli. 
Similar series can be traced in the vars. campestris and serpa. 
II1.—SPAIN (Supplement). 
Forma TYPICA. 
Wall-Lizards, in every respect similar to those of France, occur near Madrid, in 
the Loroya Valley, whence the British Museum has received 25 specimens from 
M. de la Escalera. The var. docagii occurs also in the same valley (see p. 144). 
Particulars are given of a few of these specimens. 
1 ee Wee 4 5. 6. i 
Bs 69g 56 24 10 24 18 24 
G3, aMGOMMINED 9. 2 20510) Mees 
60 55 23 9 22 162iyameeG 
" 56 6056s 9° 24> 7=ISer 
9 6 60 28 9° “26 | I1C=i7eNnees 
: 62am Sees We) 10 28 17 25 
: 60.) )48me H27 9-=| 24.1) GISSize | 423 
3) 58 «567 9 23 15 23 
Of the 25 specimens, 9 may be regarded as conforming in every respect to the 
normal pattern of scaling. Others deserve to be noted for the following pecu- 
liarities :— 
One has no indication of a masseteric disk, two have it very small on one side, 
