Reptili 



A. 



7. 



8. 



9. 

 10. 

 11. 

 12. 



Scincus officinalis. 

 Gongylus ocellatus. 

 Seps tridactylus. 

 Coronella cucullata. 

 Rana esculent a. 

 Bufo viridis. 



470 



1. Chamceleo vulgaris. 



2. Tarentola mauritanica, 



3. Uromastix spinipes. 



4. Agama colonorum. 



5. Lacerta ocellata. 



6. Zootoca deserti, n. sp. 



Pisces. 



1. Haligenes tristrami, n. sp. 2. Cyprinodon dispar. 

 1 first proceed to give descriptions of the new species. 



Zootoca deserti, Gthr. 



Diagnosis. — The posterior portion of the vertical shield very nar- 

 row, the width of the interorbital space being one-third only of that 

 of the superciliary plate. Twelve longitudinal series of rhombic 

 ventral shields. Above greenish-blue, reticulated with black. 



Hab. N'Goussa, oasis between Waregla and the M'zab Country, 

 Southern Sahara. 



Description. — This species may be readily distinguished from all 

 the other Lacertce sxidi Zootoca by its very narrow interorbital space. 

 1 . The rostral is obtusely conical. 2. The nostril is formed by three 

 plates : the superior nasal, which forms a suture with its fellow 

 behind the rostral, the first upper labial, and a single small posterior 

 nasal. 3. There are three frontal plates, a single anterior one, six- 

 sided, broader than long, with a longitudinal impression, and a pair 

 of posterior ones. 4. The vertical is cuneiform, its anterior portion 

 being broadest, with a longitudinal impression ; it tapers posteriorly, 

 and is very narrow between the orbits. 5. The occipital region is 

 covered by two pairs of plates, one pair behind the other ; there is 

 a small plate in the centre of their meeting angles ; the plates of the 

 anterior pair are triangular, those of the posterior quadrangular. 

 6. The roof of the orbit is formed by a pair of semi-elliptical super- 

 ciliaries, in front of which is a small triangular plate ; the orbital 

 margin itself is bordered by two series of very small scales. 7. One 

 loreal and one ante-orbital, the latter being bent on the upper surface 

 of the head, but not reaching to the vertical. The lower eyelid is 

 opaque and covered by very minute scales. There is a long, low, 

 triangular plate below the eye (suborbital), interrupting the series of 

 the upper labials. 8. Four upper labials before, and four much 

 smaller ones behind the sub-orbital. 9. Six lower labials ; the chin- 

 shields are arranged as usually in the species of this genus, without 

 showing any peculiarity. 10. The upper portion of the cheeks is 

 granular, like the back ; the lower is covered with small plates. 



The collar-fold is shallow, and formed by scales of moderate size ; 

 a very indistinct groove reaches from one ear to the other across the 

 throat. The upper and lateral parts of the extremities and of the 

 body are granular ; the ventral shields are nearly regular rhombs - 

 and arranged in twelve longitudinal series. The space between the 



