137 



4- Fam. Helodermatidae. 



Body long, tubercular above, covered with flat, imbricate 

 or juxtaposed scales below. Head covered with tubercular 

 scales. Tongue villose, the anterior part smooth, bifid, pro- 

 tractile. Teeth fang-like, with or without grooves. Eye small, 

 with eyelids; ear exposed or hidden. Limbs moderate or 

 short; digits clawed, granular or with transverse shields below. 

 No praeanal or femoral pores. Tail cylindrical, as long as 

 head and body. 



Two genera, of which only one inhabits the Indo-Australian 

 Archipelago. 



I. Lanthanotus Steindachner. 



(Steindachner, Denkschr. Ak. Wien XXXVIII p. 95, 1878). 



Ear hidden; teeth fang-like, without grooves; no labial 

 shields; lower eyelid with a single, semitransparent shield. No 

 gular fold. Upper surface tubercular, with rows of large tuber- 

 cles, each of which bearing a horny keeled scale; abdominal 

 scales flat, slightly imbricate. Limbs short, with short, clawed 

 digits, which are granular below. 



Distribution. Borneo. 



A single species, 



I. Lanthanotus borneensis Steind. 



Lanthanotus borneensis^ Steindachner, Denkschr. Ak. Wien XXXVIII 1878, p. 



95, Pl- I- 

 Lanthanotus borneensis^ Boulenger, Cat. Liz. II 18S5, p. 302; Proc. Zool. Soc. 



London 1899, p. 596. 



Lanthanotus borneensis^ Henshaw, Annual Rep. Mus. Comp. Zool. Harv. Coll. 



1912/13, p. 7, pi. I. 



Head depressed, oval, with broad, rounded snout, eyes very 

 small, lower eyelid with a semitransparent shield; ears con- 

 cealed; nostril small, oval, directed obliquely upwards and 

 backwards, nearer the end of the snout than the eye. Head 

 covered with small tubercular scales, enlarged on snout, fore- 

 head and temples. Body long; back covered with regular 

 longitudinal rows of large tubercles without ossifications, in 

 six series, each tubercle with a horny keeled scale; rest 

 covered with juxtaposed small flat tubercles. Lower part of 

 head with small scales, increasing towards the neck; a slight 



