PROCTOTRETUS SPLEXDIDUS. 329 



SUBGENUS PROCTOTRETUS (Dusi. & BIBR.), GRD. 



GEN. CHAR. Cephalic plates small, subequal, imbricated, and cari- 

 nated ; one or two series of supralabials. Nostrils lateral, in a line 

 with the supraciliary crest. Temporal scales moderate, carinated, 

 not acuminated. Auricular aperture small or moderate, denticu- 

 lated in front. Sides of neck with a slight longitudinal fold, and 

 a vertico-oblique one in advance of the shoulder, covered with 

 scales similar to those of the back. Dorsal and lateral scales large, 

 subequal, subrhomboid, or sublanceolated, conspicuously carinated, 

 and acuminated. Abdominal scales sublanceolated, and bifid pos- 

 teriorly. Posterior aspect of thighs minutely scaly. Colors : lon- 

 gitudinally light-streaked, with intervening series of dark spots. 



OBSERV. The small, imbricated, and keeled cephalic plates, will 

 easily distinguish this group from its natural allies. Even the abdo- 

 minal scales seem to be more deeply emarginated than in the follow- 

 ing subgeneric groups. 



According to Fitzinger, Liolaemus marmoratus, of Gravenhorst 

 (Nov. Act. Acad. nat. cur. XVIII, ii, 1838, 728, PL LIV, fig. 11), would 

 belong to this genus. 



1. PROCTOTRETUS SPLENDIDUS, Grd. 

 (Plate XVII, figs. 1-7.) 



CHAR. SPEC. Scutis labialibus exiguis, elongatis, et paulo majoribiw 

 quam supralabiales, qui in seriem duplicem disponuntur. Squamis 

 temporalibus imbricatis. Apertura auditoria parva. TJnica serie 

 scutorum infralabiaHum, exiguiorum quam labiates inferiores. Scu- 

 torum mentaUum tribus paribus. Cristis pectinatis tribus, una se- 

 cundum dorsalem regionem medianam et ana in utroque tergi latere. 

 Supra smaragdino-viridi, cum quinque seriebus macularum subova- 

 tarum, fusco-castanearum, et nigro marginatarum. Cristis pectinatis 

 lateralibus aureis. Facie capitis superiori transverse aureo Uneata. 

 Lateribus corporis et cruribus fulvoflavis, fusco variegatis. Infra 

 albescente. 



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