R H Y T I D D E I R A. 349 



naturelle, 1851, 72," P. intermedia was erroneously considered as iden- 

 tical with P. mosaica. It is admirably figured in " Du Petit Tliouars' 

 Voyage de la Venus," but not described as fully as might be desirable 

 in the present state of our Knowledge. 



Loc. — Republic of Chile. 



6. Pttchodeira mosaica, Grd. 



Spec. Char. — Labials much larger than the supralabials. Two large 

 lorals, and two small postnasals. Five or six pairs of mental shields. 

 Temporal scales moderate. Auricular aperture subtubercular. Ab- 

 dominal scales posteriorly rounded. Dark brown; middle region of 

 the back light brown ; two light streaks, and two series of black sub- 

 quadrate spots, on each side. 



Syn. — Proctotretus mosaicus, Hombr. & Jacq. Voy. au Pole Sud et dans I'Oce- 

 aaie. Kept. Sauriens. PI. ii, fig. 1. — GuiCH. in Gai/, Hist, de Chile, Zool. II, 

 1848, 26.— DuM. & A. DtJM. Catal. meth. Kept. Mus. d'hist. nat. i, 1851, 72. 



Observ. — In the ^' Catalogue methodique des Reptiles du Museum 

 d'histoire naturelle," Messrs. Dumeril consider this species as identical 

 with P. intermedia, subsequently, however, given as a distinct species. 

 The latter is more closely allied to P. cyanogaster than to any other 

 we are so far acquainted with. 



Loc. — Republic of Chile. 



Subgenus RHYTIDODEIRA, Girard. 



Char. GEN". — -Scutis cephalids modicis, ampliorihuSj non imbricaiis, 

 laevibus. Unica serie scutorum supralahialium. Naiihus latera- 

 lihus. Squamis temporalibus imbricaiis, laevihus, vel subcarinatis, 

 Aurium margine anteriore granuloso, tuberculato, vel suhdenticulato. 

 Colli lateribvjS plicatis, granulosis ; plicatura scapulari vertico-ob- 

 liqua nulla. Squamis dorsualibus rhomboideis, carinatis, acumina- 

 lis; abdominalibus rliomboideis, laevibus, postice pilerumque Integris. 



88 



