On some Reptiles and a Frog from Argentina, 365 XXXIX. — Note on some Reptiles and a Frog from Argentina. Bj Dr. A. GiiNTHER, F.R.S. I HAVE received from Falkland Ricketts, Esq., a small collection of Reptiles which he made in Santa Fc. It con-tained three lizards [Ameiva surinamensis, Anisolepis undu~ latus, and Lepidosternum affine), eight snakes [Pseudahlahes Agassiziij Liophis j^ceciloggrusj Xenodon rhabdocephalas [or X. Merremiiy Wagl. ?, BouL, Peracca], T/iamnodgnastes Nattererij Philodryas Schotti, Pkilodrgas psanimophideus, Oxyrhopus rhombifer^ and Lachesis alter natus), and one frog, which 1 consider to be a distinct and undescribed species. The specimen of Anisolepis undulatus, which species is still a desideratum to the majority of collections, is unfortu-nately not in a good state of preservation. The Amphis-bienian is, without doubt, Lepidosternum affine^ Bottger. I do not consider L. Boettgeri^ Boul. Lizards, ii. p. 466, from Corrientes, to be distinct from Bottger's species, and probably both are identical with Strauch's L, GUntheri. The specimen in Mr. Ricketts's collection is of nearly the same size as the type of L. Boettgeri. It has 254 annuli of the body and 14 of the tail ; an annulus contains 30 dorsal and 26 ventral segments. There are 6 well-formed pra^anal segments, with a minute rudimentary one on each side. In L. Boettgeri I count 7, 3 on one and 4 on the other side. Also the shape and arrangement of the parietal and occipital shields seem subject to abnoimal asymmetry and individual variation. In our specimen they are more symmetrical than in the type of L. Boettgeri^ the parietal being broader than long (one more so than the other) and the occipital not quite twice as broad as long. I dedicate the new tree-frog to the collector, naming it Phyllomedusa Richettsii^ sp. n. Parotoids large, rather longer than the head, commencing from above the middle of the eye and forming an elongate prominent pad on each side of the head and neck. Upper and lateral parts, also the upperside of the thighs, covered with rather large tubercles, the remainder of the hind leg, the fore limb, and head being smooth. Lower parts coarsely granular, the largest granules are enclosed within the yellow patches about to be described.
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