L. G. ANDERSSON, NEW LIZARDS FROM SOUTH AMERICA. 5 



different lepidosis of the head. In addition to this U . umbra 

 bas a »feeble longitudinal fold» on the chin, less raised supra- 

 ciliary edge and a different colour, especially on the head. 

 By the kecled scales of the head my species approaches U . 

 plica L., but it differs from the same in many other points, 

 especially in having a broader occipital, larger scales on the 

 back and sides, keeled ventrals, and in the absence of lateral 

 folds, spiny tufts, and serrated upper ridge of the tail. 



Tretioscinciis romani n. sp. 



Body moderately elongate. Frontonasal very large and 

 broad, forming a long suture witli the rostral as well as with 



Fig. 3. Tretioscincus romani n. sp. ^/i. 



A. österberg del. 



Fig. 4. Tretioscincxir, romani n. sp. "/i- 



A. österberg del. 



the f rontal. Prsefrontals small, widely separated; frontal 

 heptangular, the anterior part twice as broad as the posterior 

 one, as long as, but much narrower than frontonasal. Two 

 rather small frontoparietals; parietals short and vcry broad; 

 interparietal broad, large, hexagonal, somewhat longer than 



