BRACHYLOPHUS. 373 



OBSERV. This species, which, at first sight, resembles so closely 

 the preceding one, is, nevertheless, easily distinguished from it, so soon 

 as the differences are once pointed out. 



LOG. Republic of Chile. 



3. ORTHOLAEMUS FITZROII, Grd. 



SPEC. CHAR. Head rather short ; snout obtuse, subrounded. Cepha- 

 lic plates small and numerous. Two series of supralabials. Auri- 

 cular aperture moderate-sized, with minute granular scales in front. 

 Temporal scales small, flat, and smooth. Dorsal scales moderate ; 

 lateral scales smaller ; abdominal scales smooth and polished, emar- 

 ginated upon the sides of the throat and under aspect of the neck. 

 Posterior aspect of thighs granular, with a patch of scales near the 

 tail. Ash-grey, with dark brown marks and specks of orange and 

 blue. Gorge orange-colored, with faint stripes of blue. 



STN. Proctotretia wiegmannii, BELL, Zool. Voy. Beagle, V, 1843, 15. PI. VIII, 

 figs. 1-2. 



Liolaemus wiegmannii, GRAY, Catal. Lizz. Brit. Mas. 1845, 216. 



Ortholaemtis fitzroii, GRD. in Proc. Acad. Nat. Sci. Philad. November, 1857, 198. 



OBSERV. This species, identified by Thos. Bell with Proctotretus 

 wiegmanni, of the French herpetologists, does not even belong to the 

 same subgeneric division. It is equally distinct from the preceding 

 two species, its true congeners. 



LOG. Bahia Blanca and Rio Negro, Patagonia; and Maldonado, 

 near the mouth of the Rio La Plata. 



GENUS BRACHYLOPHUS, Cuv. 



GEN. CHAR. A slight hanging longitudinal fold under the throat. A 

 transverse fold across the chest to the shoulders. Cephalic plates 

 small, polygonal, smooth, and nearly equal. Tympanum near the 

 outer edge of the auricular aperture. Teeth upon the palatine bones. 



94 



