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Show 1881.] LIZARDS FROM ECUADOR. 245 precisely analogous case in the Agamidse, in which I felt loth to create an artificial genus, I have acted in the same way in the present instance. The Uromastix 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 Uromastix 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, Guichenot. One adult and two young from Canelos, and one adult from Sarayacu in Ecuador. There is a locality of the same name (Sarayacu) in Peru. 27. URANISCODON UMBRA, Kaup. A single specimen from Sarayacu, Ecuador. EXPLANATION OF THE PLATES. PLATE XXII. Fig. 1. Cercosaura (Pantodactylus) reticulata, p. 230. 1 a. - ( ) , head above. 1 b. ( ) , dorsal scutes. 1 c. ( ) , ventral scutes. 2. Leposoma buckleyi, p. 233. 2 a. , half undersurface. 2 b. , scales of back. 3. Cercosaura (Prionodactylus) manicata, p. 231. 3 a. ( ) , under surface of fingers. PLATE XXIII. Fig. 1. Ecpleopus (Euspondylus) guentheri, entire, p. 235. 2. Goniodactylus concinnatus, p. 237, entire. 3. buckleyi, p. 238, entire. PLATE XXIV. Fig. 1. Anolis boulenyeri, p. 242. 1 a. , head from above. 2. Enyalius microlepis, p. 238. PLATE XXY. Fig. 1. Enyalius prcestabilis, p. 240. 1 a. , scutellation of side. 2. Hoplocercus annularis, p. 244. |