NELLY DE ROOY. REPTILES. 



141 



23. Lygosonia nigriventre n. sp. 



de Rooy, Indo-Austr. Rept. I 1915; p. 214, fig. S3. 



Helhvig Mts. 1907, 1 spec. 

 Hellwig Mts. 1700 M. 1909 2 spec. 



Section Lygosonia. Head small, very flat; snout short, rounded; lower eyelid scaly; 

 ear-opening oval, smaller than the eye-opening, no 

 lobules. Nostril in the nasal ; no supranasals ; rostral 

 reaching between the nasals ; frontonasal more broad 

 than long, in contact with the rostral; praefrontals 

 rather large, forming a suture ; frontal broader than 

 the supraocular région, shorter than frontopari étals 

 and interparietal together, in contact with the first 

 supraciliary and the two anterior supraoculars; four 

 supraoculars ; eight supraciliaries; frontoparietals and 

 interparietal subequal ; parietals in contact ; no nuchals ; 

 rîfth upper labial below the eye. Body long; the 

 distance between the tip of the snout and the fore 

 limb is contained one time and a half in that be- 

 tween axilla and groin ; 30 smooth scales round the 

 middle, dorsals largest; praeanals enlarged. Tail 

 thick. Limbs short, separated when adpressed; 

 digits short, compressed ; fourth toe with 16 — 20 

 lamellae below. 



Reddish-brovvn above, with numerous lighter, 

 dark-edged spots; head with dark spots. Scales of 

 the lower parts bordered with dark brown or greyish, 

 with a yellowish centre; tail dark brown below, the 

 scales dark with lighter borders. The largest of 



the three spécimens measures go mm. from snout to vent ; the tail, of which the tip is 

 broken off, 1 1 1 mm. 



fig. 4. Lygosonia nigriventre n. sp. 



24. Lygosonia neuhanssi Vogt. 



Vogt, Sitzgsber. Ges. Naturf. Fr. Berlin No. 9 191 1, p. 422. 

 de Rooy, Indo-Austr. Rept. I 1915, p. 217. 



Bivak Island 191 2, 1 spec. 



Closely allied to Lygosonia pratti Blgr. It differs in having dark longitudinal lines 

 on the back. 



Section Lygosonia. Head small, snout obtusely pointed ; lower eyelid scaly ; ear distinct, 

 oval, no lobules. Rostral more broad than high ; nostril in the nasal ; no supranasal ; fronto- 

 nasal squarish, forming a short suture with the rostral and the frontal ; latter twice as broad 

 as the supraocular région, as long as frontoparietals and interparietal together, in contact with 

 the first supraocular and the first supraciliary; four supraoculars; five supraciliaries; fronto- 

 parietal and interparietal distinct, latter largest ; parietals in contact behind the interparietal ; 

 Nova Guinea XIII. Zoologie. 19 



