198 PROCEEDINGS OP THE ACADEMY OF 



carinated and imbricated. Auricular aperture denticulated in front. Sides of the 

 neck, pouched, with small exteriorly and small granules within the pouches. 

 A vertico-oblique fold in advance of the shoulder. Dorsal scales moderate, 

 conspicuously carinated, acuminated, central dorsal series simulating a low 

 crest. Abdominal scales smooth and entire. Femoral and preanal pores none. 

 Tail broad at the base, compressed and tapering posteriorly. Fingers and toes, 

 five, slender, unequal. 



15. Saccodeira ornatissima. — Cephalic plates very small and nearly equal 

 sized. Suprulabials in one series, slender and smaller than the labials. Tem- 

 poral scales quite small. Auricular aperture large. Scales subequal ; dorsal 

 and lateral ones sublanceolated and carinated ; abdominal ones posteriorly 

 rounded. Posterior aspect of thighs minutely and wholly granular. Greyish 

 brown above, with a double series of dark brown, subtriangular spots along the 

 dorsal region. Limbs maculated. Upper surface of head blackish ; sides and 

 under surface whitish, with small jet black spots. Abdomen dull yellow, uni- 

 color. 



Localities. — Obrajillo and Yanga, Peru. 



16. Proctotretus splendidus. — Proctotretus peciinatus, Bell, Zool. Voy. 

 Beagle, v, 1843, 18, Plate ix, fig. 2. — Labial plates narrow and long, somewhat 

 larger than the supralabials, which are disposed upon two series. Temporal 

 scales imbricated. Auricular aperture small. One series of infralabials, nar- 

 rower than the lower labials. Three pairs of mental shields. Three pectinated 

 crests, one along the dorsal line, and one on each side of the back. Emerald 

 green above with five series of chestnut brown, black margined spots. The 

 lateral pectinated crests bright yellow. Head transversally streaked with bright 

 yellow. Sides and limbs variegated with brown upon a fawn yellow ground. 

 Beneath white. 



Locality/ — Patagonia. 



RHYTIDODEIRA, (nov.gen.) — Cephalic plates rather well developed or moder- 

 ate sized, not imbricated, smooth ; one series of supralabials. Nostrils lateral. 

 Temporal scales imbricated, smooth or subcarinated. Auricular aperture granu- 

 lar, tubercular or subdenticulated in front. Sides of the neck folded, granular : 

 a vertico-oblique scapular fold. Dorsal scales rhomboid, carinated, acuminated ; 

 abdominal scales rhomboid also, smooth, generally entire posteriorly. Thighs 

 either wholly granular or provided with a patch of scales near the tail. Colora- 

 tion : Longitudinal streaks of various hues with intervening series of spots : 

 occasionally, however, transversally banded. 



Observation. — To this genus belong: 1. Proctotretus kingii, Bei^Xj ; 2. Procto- 

 tretus ma^cll'inicus, Hombr. & Jacq. ; 3. P. bibroni, Bell ; 4, P. wiegmannii, Dtjm. 

 & BiBR. : 5. Tropidurus nigromaculatus, Wiegm. ; 6 Tropidurus oxycephalus, Wiegm. 



EULAEMUS (nov. gen.). — Cephalic plate moderate sized, else well developed, 

 smooth ; one series of supralabials. Nostrils lateral. Temporal scales sub- 

 imbricated, subcarinated or smooth. Auricular apertures large, denticulated 

 or tubercular in front. Sides of the neck folded and granular; a vertico- 

 oblique scapular fold. Dorsal scales moderate, subrhomboid, slightly carinated. 

 posteriorly obtuse ; lateral scales rather smaller or subequal ; abdominal scales 

 rhomboid or rounded, and entire. Thighs wholly granular, else minutely scaly. 

 Coloration : Transverse black or brown spots or bands, generally light margined, 

 upon a rather dark ground; longitudinal streaks obsolete, if at all f)resent. 



Observation. — This genus embraces: 1. Proctotretus tenuis, Ddm. & Bibr. ; 2. 

 P. daru-inii, Bell; 3. P. pictus, Dum. & Bibr.; 4. P. fitzingcrii, DuM. &. Bibr.; 5. 

 P. fitzinyerii, Bell. (^E. aj/inis, Grd.) ; 6. /'. signifer, Dum. & Bibr. ; and 7. Lio- 

 Immus macul.alus, Gray. 



ORTHOL/EMUS(nov. gen.). — Cephalic plates rather small, not imbricated, 

 smooth ; three or more series of supralabials. Nostrils superior. Temporal 



November; 



