158 IGTJANID^. 



with very long falciform claws, are very feebly keeled inferiorly, and 

 the fourth toe is fringed laterally. Eight to ten anal pores. Tail 

 depressed, as long as or slightly longer than head and body ; caudal 

 scales much larger than dorsals. Grey above, with numerous small 

 black spots, some of which are bordered with white ; lower surfaces 

 white, uniform or spotted with blackish. 



Total length 136 millim. 



Head 16 „ 



Width of head 13 „ 



Body 52 



Fore limb 25 



Hind limb 39 



)» 



>> 



»5 



Tail 68 „ 



Chili ; Northern Patagonia. 



a-h. iS & yg. Bahia Blanca. C. Darwii, Esq. [P.]. 



These specimens differ from Bibron's description in having two 

 or three instead of four series of scales between the labials and the 

 infraorbital ; also in having a patch of large scales on the hind side 

 of the thighs. Should they be regarded as a distinct species, they 

 must bear the name L. beaglii, Girard. 



25. SACCODEIRA. 



Proctotretus, part., Dum. t^- Bibr. iv. p. 266; Fitzing, Syst. Rept. 



p. 74. 

 Ptygoderus, (non Fitz.) Gray, Cat. Liz. p. 216. 

 Saccodeira, Girard, Proc. Ac. Philad. 1857, p. 197, and U.S. Explor. 



Expcd., Her J), p. 322. 

 Proctotretus, Girard, I. c. p. 329. 

 Tropidocephalus, F. Milller, Verh. Nat. Ges. Basel, vii. 1882, p. IGO. 



Tympanum distinct. Body slightly depressed. Dorsal scales 

 imbricate, keeled, the vertebral series simulating a low crest. Upper 

 head-scales small, keeled. Xo transverse gular fold. Digits sub- 

 cylindrical or compressed, with keeled lamellae inferiorly. Ko 

 femoral or anal pores. Tail subcylindrical ; caudal scales not verti- 

 cillate. Lateral teeth tricuspid ; pterygoid teeth. A small sternal 

 fontanelle. Xo abdominal ribs. 



South America. 



Synopsis of the Species. 



Upper head-scales multicarinate ; ventral 



scales smooth 1. ornatissima, p. 159. 



Upper head-scales unicarinate ; ventral 



scales smooth 2. pectinata, p. 159. 



Upper head-scales unicarinate ; ventral 



scales keeled 3. azarea, p. 160. 



