RHYTIDODEIRA. 349 



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

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

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

 in the present state of our Knowledge. 



LOG. Republic of Chile. 



6. PTYCHODEIRA 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. Proclotretus mosaicut, HOMER. & JACQ. Voy. au Pole Sud et dans 1'Oce- 

 anie. Rept. Sauriens. PI. rr, fig. 1. GUICH. in Gay, Hist, de Chile, ZooL II, 

 1848, 26. DUM. & A. DUM. Catal. meth. Rept. 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*. Seutis cephalicis modicis, amplioribus, non imbricatis, 

 laevibus. Unica serie sctttorum supralabialium. Naribus latera- 

 libus. Squamis .temporalibus imbricatis, laevibus, vel subcarinatis. 

 Aurium margine anteriore granuloso, tuberculato, vel subdenticulato. 

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

 liqua nulla. Squamis dorsualibus rhomboideis, carinatis, acumina- 

 tis; abdominalibus rhomboideis, laevibus, postice plerumque integris. 



88 



