24, AROALIA. — 25. OREOSAUEra. 409 



broad on the back, shorter on the belly ; lateral scales smaller, sub- 

 oval ; thirty to thirty-five scales round the middle of the body, t^iirty 

 from occiput to sacrum inclusively, and twenty-seven or twenty-eight 

 from collar fold to pra^aiial region. Praianal shields in two rows, 

 four in the first, six in the second. Limbs with large smooth shields : 

 hinder side of thighs "with small scales. Nine to twelve femoral 

 pores on each side. Caudal scales elongate quadrangular, smooth, 

 forming regular annuli. Olive-brown above, witli or without 

 reddish brown marblings ; flanks with equidistant groups of cream- 

 coloured spots; the sutures of the head-shields generally dark 

 brown ; lower surfaces yellowish. 



millim. millim. 



Total length 228 212 



Head : . . 25 19 



Width of head 17 12 



From end of snout to fore limb . 38 29 



From end of snout to vent .... 03 82 



Fore limb 28 21 



Hind Hmb 37 28 



Tail 135 130 



Colombia ; Venezuela. 



a-b. 5- Colombia. (Types.) 



c-d, j . Venezuela. (Types of A. olivacea.') 



25. OREOSAURUS. 



Oreosaurus, Peters, Ahh. Berl. Ac. 1862, p. 201. 



Tongue moderately elongate, arrow-headed. Lateral teeth com- 

 pressed, bi- or tricuspid. Head with large regular shields ; fronto- 

 nasal separating the nasals ; no prtefrontals ; frontoparietals present ; 

 nostril pierced in the middle of a single nasal. Eyelids developed, 

 lower -with a non-transparent disk. Ear exposed. Limbs well de- 

 veloped, pentadactyle. Dorsal scales elongate quadrangular, feebly 

 keeled, juxtaposed, forming regular transverse rows ; lateral scales 

 small ; ventrals large, quadrangular, smooth, arranged in longitudinal 

 and transverse series. A strong collar fold. Tail cylindrical. Males 

 with femoral ])ores, females without. 



Colombia, Ecuador, Brazil. 



Synopsis of the Species. 

 I. A lorcal ; four supraoculars. 



Thirty-five scales from occi]mt to base of tail ; 



male witli five or six femoral pores on each 



side 1 . ocidatus, p. 4 1 0. 



Forty-three scales from occiput to base of 



tail ; male with ten to twelve femoral pores 



on each side 2. luctuosus, p. 4Io. 



