Blackish-brown above, iridescent, with narrow yellowish 

 transverse bands, alternating on the back; flanks with broader 

 yellow vertical spots from the third row of scales to the ven- 

 trals, partly alternating with the dorsal bands; anterior chin- 

 shields with yellow centre. Chin and throat dark with yel- 

 lowish spots in the middle of the scales. Length of head and 

 body 374 mm.; tail 56 mm. (After WERNER; not seen by me). 



Habitat: Sumatra (Pudang in district Babongan). 



6. Iguanognathus Boulenger. 



(BOULENGER, Ann. Nat. Hist. (7) II p. 73, 1898). 



Head small, slightly distinct from neck; eye small; pupil 

 round; nostril directed upwards, between two nasals; internasals 

 small, trapezoid; no loreal. Maxillary, palatal and mandibular 

 teeth with spatulate crowns, ribbed along the outer side, about 

 equal, 23 in each maxillary (fig. 28). Body round, covered 

 with smooth scales without pits, in 19 rows; ventrals rounded. 

 Tail moderate; subcaudals in two rows. 



Distribution. Sumatra. 



A single species. 



i. Iguanognathus werneri 

 Boulenger. 



Iguanognathus werneri, Boulenger, 

 Ann. Nat. Hist. (7) II 1898, 

 p. 73, tekst-fig. 



Snout short and broad, 

 rounded ; rostral two times 

 as broad as deep, just 

 visible from above; inter- 

 nasals small, trapezoid, as 

 long as broad ; praefrontals 

 as long as internasals, twice 

 as broad; frontal twice as 

 broad as the supraocular, 

 longer than its distance 

 from the tip of the snout, 

 Fig. 28. Iguanognathus werneri Blgr. shorter than the parietals; 



After Boulenger. three prae oculars, the mid- 



dle one in contact with the posterior nasal; three postoculars; 

 temporals 2 + 2; eight upper labials, fourth entering the eye; 



