AND BATRACHIANS OF BARBAET. 107 



III. Tongue bifid, covered with rhomboidal, imbricate papillae ; head with 

 symcaetrical shields. 



Body vermiforin ; eyes hidden 5. Amphisbaenidae. 



Femoral pores 6. Lacertidse. 



No femoral pores ; scales cycloid, imbricate 7. Scincidae. 



Fam. 1. GECKONID^. 



The S genera by which this family is represented in Barbary may be distinguished 

 by means of the following key : — 



I. Digits not dilated. 



A. Digits straight, of equal diameter throughout. 



1. Digits denticulated laterally and keeled inferiorly. 



Scales small 1. Stenodactylus. 



Scales large and imbricate 2. Tropiocolotes. 



2. Digits not denticulated laterally, with smooth lamellae inferiorly . 3. Saurodactylus. 



B. Digits flattened at the base, compressed at the end 4. Gymnodactylus. 



II. Digits dilated at the apex only. 



Digital expansion inferiorly with two plates 5. Phyllodactylus. 



Digital expansion inferiorly with two diverging series of lamellae .... 6. Ptyodactylus. 



III. Digits dilated at the base or throughout. 



All the digits clawed, the claw supported by a free, compressed joint ; sub- 

 digital lamellce in pairs 7. Hemidactylus. 



Third and fourth digits with a sessile claw ; subdigital lamellae entire ... 8. Tarentola. 



1. Stenod.\cttlus, Fitzinger, 1826. 



Digits not dilated, furnished with a long claw, and a lateral fringe or denticulation 

 of pointed scales ; inferiorly with a series of keeled scales. Scales juxtaposed or sub 

 imbricate. Pupil vertical. No prseanal or femoral pores. 



Sand-Geckos, represented by one species in Algeria and Tunisia. 



1. Stenodactylus guttatus, Cuvier, 1829. 

 S. mauritanicus, Guichenot. 



Head very variable in shape ; snout rounded or more or less pointed. Body short, 

 limbs long and slender. Body covered with subequal granules, which may be convex, 

 smooth, or slightly keeled, or flat and subimbricate on the back; the size of these 

 granules varies considerably. Nostril pierced in the middle of a more or less distinct 

 swelling, between three nasals, the first labial, and usually also the rostral ; no chin- 

 shields. Tail covered with small juxtaposed keeled scales. Light buff or brownish 

 above, with round whitish spots between a brown network, sometimes with Ul-defined 

 brown cross-bands ; tail with brown annuli ; white inferiorly. 



From snout to vent 58 millim., tail 40. 



