LYGOSOMA. 193 



Of all Reptilian genera this contains the most species, the number 

 amounting already to 166. They are represented in every part 

 of the World, Europe excepted, attaining their greatest number 

 and variety of form in the Australian Region. 



Synqpei* of Indian, Ceylonese, and Burmese Species. 



A. Limbs well developed, pentadactyle; 



length of hind liino exceeds distance 

 between centre of eye and fore limb ; 

 lower eyelid scaly. 



. No supranasals ; dorsal scales smooth. 

 '. Four large supraoculars ; rostral con- 

 vex. 

 a". 36 to 38 scales round middle of 



body L. indicum, p. 195. 



6". 30 to 32 scales round body L. zebratum, p. 195. 



b'. Five large supraoculars ; rostral flat 

 or concave above ; 38 to 40 scales 

 round middle of body. 

 a". The hind limb, stretched forwards, 



does not reach beyond axilla .... L, maculatum, p. 196. 

 b". The hind limb reaches shoulder or 



beyond L. dussumieri, p. 197. 



b. Supranasals present ; dorsal scales 



keeled ; 28 to 30 scales round body. . L. olivaceum, p. 197. 



B. Limbs well developed, pentadactyle ; 



length of hind limb exceeds distance 

 between centre of eye and fore limb ; 

 lower eyelid with an undivided trans- 

 parent disk ; no supranasals. 

 . Rostral forming a straight suture with 



frontonasal. 



a', Frontoparietals two. 

 a". No enlarged nuchals. 



a. 30 scales round middle of body ; 

 frontonasal in contact with 



frontal L. kakhienense, p. 198. 



ft. 34 to 36 scales round body ; prse- 

 frontals forming a median su- 

 ture L. melanostictwn, p. 199. 



b". Two to tive pairs of enlarged 



nuchal s. 



a. Ear-opening smaller than trans- 

 parent palpebral disk ; 22 to 24 



scales round middle of body .... L. sikkimense, p. 199. 

 8. 26 or more scales round body, 

 a'. 26 to 30 scales round body ; 

 16 to 18 lamellae under fourth 

 toe ; ear-opening about as 

 large as transparent palpebral 



disk L. himalayanum, p. 200. 



/3'. 26 to 28 scales round body; 

 16 to 18 lamellae under fourth 

 toe ear-opening considerably 

 larger than transparent pal- 

 pebral disk L. dori(e t p. 201. 



o 



