142 MR. a. A. BOULENGEE ON THE 



{striatce) are the most primitive, from which first the reticulated {reticulatce) 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. 



II.— 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. hocagii occurs also in the same valley (see p. 144). 



Particulars are given of a few of these specimens. 



1. 



c? 69 



„ 63 



„ 60 



„ 56 



? 65 



„ 62 



„ 60 



„ 58 



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. 



