R H Y T I D D E I R A M A G E L L A N I C A. 351 



Rhytidodeira Icingii, Grd. iu Proc. Acad. Nat. Sci. Philad. November, 1857, 198. 



Obsery. — Not met with by the U. S. Exploring Expedition, and 

 having no specimens at our command, it is not deemed expedient to 

 enlarge upon this species. 



Loc. — Port Desire, Patagonia. 



2. Ehytidodeira magellanica, Grd. 



Spec. Char. — General form thickish and short. Head rather small ; 

 snout short and obtuse. Cephalic plates somewhat convex ; supra- 

 labials smaller than the labials. Five very small lorals, and two 

 small postnasals. One series of infralabials. Four pairs of mental 

 shields. Temporal scales small and smooth. Auricular aperture 

 small, bituberculated in front. Abdominal scales posteriorly 

 rounded. Posterior aspect of thighs wholly granular. Tail rather 

 short. Blackish-brown above, with five longitudinal white streaks, 

 between which may be observed series of irregularly quadrangular, 

 jet-black spots, anteriorly and posteriorly margined with white. 



Syn, — Proctotretus magellanicus, HoMBR. & Jacq. Voy. au Pole Sud et dans 

 rOeeanie. PI. ir, fig. 2 ; &, B b b'.— Guich. in Gai/, Hist, de Chile, Zool. II, 1848, 

 46. — DuM. & A. DuM. Catal. meth. Rept. Mus d'hist. nat. i, 1851, 75. 



Proctotretus Idngii, Bell, Zool, Voy. Beagle, Y, 1843. PI. vi, fig. 2. 



Rhytidodeira magellanica, Grd. iu Proc. Aoad. Nat. Sci. Philad. November, 1857, 

 198. 



Obsery. — This is a very handsome species, next to P. splendidus 

 in beauty, though of a very different style. Here, no metallic reflec- 

 tions, no glittering of iridescent hues, but simply the white and black, 

 so distributed as to produce a most pleasing effect to the eye. It is 

 admirably figured in the "Voyage au Pole Sud et dans I'Oceanie." 

 It was not secured by the Exploring Expedition, which, during its stay 

 at Tierra del Fuego, '' met no reptile of any kind." 



Loc. — Pecket Harbor, Strait of Magellan, and Port Desir^, Pata- 

 gonia. 



