422 TEIID^. 



millim. millim. 



Total length (extremity Width of head 4 



of tail lost) 122 From end of snout to vent 64 



Head 6 Fore limb 2-7 



Nauta, Peruvian Amazons. 



30. HETERODACTYLUS. 



Heterodactylus, Spix, Spec, Nov. Lacert. Bras. p. 25 ; Dtim. 8f Bihr. 



V. p. 444 ; Gray, Cat. Liz. p. 59. 

 Chirocolus, Wagler, Syst. Amph. p. 157 ; Wiegm. Herp. Mex. p. 10. 



Tongue moderately elongate, arrow-headed. Lateral teeth bi- 

 cuspid. Head with large regular shields ; a frontonasal separating 

 the nasals ; prsefrontals and frontoparietals absent ; nostril pierced 

 in the suture between the nasal and the first labial. Eyelids deve- 

 loped, lower with a transparent disk. No ear-opening. Limbs 

 short, with well developed digits ; the inner finger rudimentary, 

 tubercular, clawless. Dorsal and lateral scales equal, hexagonal- 

 lanceolate, keeled, imbricate, forming transverse series ; ventrals 

 large, subquadrangular, rounded and overlapping posteriorly, smooth, 

 arranged in regular longitudinal and transverse series. No collar 

 fold. Tail cylindrical. Males with, females without, femoral 

 pores. 



Brazil. 



1. Heterodactylus iinbricatus, 



Heterodactylus imbricatus, Gray, Cat. p. 76, 

 Heterodactylus imbricatus, Spix, I. c. pi. xxvii, fig. 1 ; Dum. 8f Bibr. 

 V. p. 447 ; ReiJih. ^' Liitk. Vidensh. Meddel. 1861, p. 217, pi. vi. 

 fig. 11; Peters, Ahh. Berl Ac. 1862, p. 172; Boideng. Proc. Zool. 

 Soc. 1885, p. 1. 



Head short, snout broad, truncate ; body much elongate. Fronto- 

 nasal large, hexagonal, broader than long ; frontal narrower, penta- 

 gonal, a little longer than broad ; a pair of hexagonal parietals, 

 followed by two pairs of large transverse occipitals ; interparietal very 

 small or absent, seldom in contact with the frontal ; three supraoculars ; 

 a narrow loreal ; a row of small infraorbitals ; temples shielded ; six 

 upper and four lower labials ; chin -shields, one anterior and two large 

 pairs, the first pair and sometimes also a short x^ortion of the second 

 forming a suture ; median gulars transversely enlarged. A row of 

 six elongate pectoral shields. Dorsal scales very narrow, lanceolate, 

 ending in a long sharp point ; thirty-three or thirty-five scales 

 round the middle of the body, ventrals included ; thirty-two to 

 thirty-five scales from occiput to base of tail. Ventrals longer than 

 broad, in six or eight longitudinal and twenty-five or twenty-six 

 transverse series. Five elongate pr^eanals, outer very narrow. 

 Limbs with smooth shields. Male with four femoral and one or 

 two praeanal pores on each side. Tail extremely long and thick, 

 tapering gradiially at the end, covered with annuli of scales similar 

 to the dorsals. Yellowish brown above, sides darker ; a more or less 



