1881.] LIZARDS FROM ECUADOR. 245 



precisely analogous case in the Agamidee, in which I felt loth to 

 create an artificial genus, I have acted in the same way in the pre- 

 sent instance. The Urotnastix princeps recently described by me 

 (P. Z. S. 1880, p. 445) has an abnormally flattened spinous tail of 

 extraordinary appearance, but somewhat like the tail of H. spinosus. 

 It consequently differs from the other species of Urotnastix with 

 long verticillated tails, in just the same way as H. spinosus differs 

 from the present species. In other respects these two species are 

 so similar that it is difficult to draw up a complete specific diagnosis 

 of the new one. There are, however, fewer labial shields ; and the 

 limbs are considerably longer, the hind ones reaching to the front of 

 the ear, while in H. spinosus they reach only to the shoulder. 



25. Plica umbra. Gray. 



One young specimen from Pallatanga. 



26. Uranocentrum flaviceps, Guicheuot. 



One adult and two young from Cauelos, and one adult from 

 Sarayacu in Ecuador. There is a locality of the same name 

 (Sarayacu) in Pern. 



27. TJraniscodon umbra, Kaup. 



A single specimen from Sarayacu, Ecuador. 



EXPLANATION OF THE PLATES. 



Plate XXII. 



Fig. 1. Cercosaura {Vantodactylus) reticulata, p. 230. 



1 a. ( ) , head above. 



1 b. ( ) , dorsal scutes. 



1 c. ( ) , ventral scutes. 



2. Leposoma buckleyi, p. 233. 



2 a. , half imdersurface. 



2h. , scales of back. 



3. Cercosaura {Prionodactylus) manicata, p. 231. 



3 a. ( ) , under surface of fingers. 



Plate XXIIL 



fig. 1. Ecjileopus (Euspondyhis) guenfheri, entire, p. 235. 



2. Goniodacfylus concinnatus, p. 237, entire. 



3. buckleyi, p. 238, entire. 



Plate XXIV. 



Fig. 1. Anolis boidengeri, p. 242. 



1 a. , head from above. 



2. Enyalius mierolepis, p. 238. 



Plate XXV. 



Fig. 1. Enyalius pressiabilis, p. 240. 



1 a. , scutellation of side. 



2. Hoplocercus annularis, p. 244. 



