10. crocopitvurus.—11. nrusticuRtS. 381 
pores very small, rather indistinct, six to ten. Caudal scales elon- 
gate, keeled, straight, in regular cross rows, the upper with pointed 
posterior edge, the laterals and inferior rounded posteriorly. Brown 
above, dotted with black ; digits with black annuli; lower surfaces 
yellow, with scattered blackish spots. 
millim. millim. 
Total length ...... 510 Fore limb ........ 49 
Mead sa ipsa genes 35 Hind limb........ 7 
Width of head .... 20 Pal? cpusigocxcaencgenes 360 
OGY: Leuhe dt sat 125 
Guianas; Brazil. 
a. o. Amazons. 
a. 9, aioe Sir A. Smith [P.]. 
11. NEUSTICURUS. 
Neusticurus, Dum. § Bibr. v. p. 61. 
Custa (non Flem.), Gray, Cat. Liz. p. 25. 
Tongue moderately elongate, arrow-headed. Lateral teeth com- 
pressed, bi- or tricuspid. Head with large regular shields ; fronto- 
nasal separating the nasals ; prefrontals and frontoparietals present ; 
nostril pierced in the middle of a single nasal. Eyelids developed, 
lower with a transparent disk composed of one or several scales. 
Ear exposed. Limbs well developed, pentadactyle. Dorsal lepidosis 
composed of small scales intermixed with large keeled ones forming 
longitudinal series ; ventral plates large, squarish, forming regular 
longitudinal and transverse series. A collar fold. Males with fo- 
moral pores, females with a few preanal pores only. Tail compressed, 
with a double denticulated keel superiorly. 
South America. 
1. Neusticurus bicarinatus. 
Custa bicarinata, Gray, Cat. p. 25. 
Lacerta bicarinata, Linn. S. N. i. p. 361. 
Draczena bicarinata, Guér. Icon. R. A., Rept. pl. iii. fig. 2. 
Neusticurus bicarinatus, Dum. § Bibr. v. p. 64. 
Snout pointed; canthus rostralis very strong ; the diameter of the 
ear-opening about half that of the eye. Transparent disk of lower 
eyelid composed of several pieces. Head-shields: a pair of fronto- 
nasals, a pair of preefrontals, a small azygos shield at the intersection 
of the four latter; a frontal, slightly grooved medially ; a pair of 
frontoparietals and an interparietal, of subequal size, the latter further 
back than the former; occipital region with small irregular shields ; 
four supraoculars, anterior more or less divided; a loreal; a row of 
six infraorbitals ; a row of granules between the loreal and anterior 
infraorbital and the labials; latter, six or seven upper and four 
lower ; chin-shields, one anterior and four pairs, Gular scales rather 
