On some Reptiles and a Frog from Argentina. 365 



XXXIX. — Note on some Reptiles and a Frog from Argentina. 

 By Dr. A. Gdnther, F.K.S. 



I HAVE received from Falkland Ricketts, Esq., a small 

 collection of Reptiles which he made in Santa Fe. It con- 

 tained three lizards (Ameiva surinamensis, Anisolepis undu~ 

 latuSj and Lepidosternum affine), eight snakes [Pseudahlahes 

 Agassiziij Liophis j/oeciloggrus, Xcnodon rliahdocephalus [or 

 X. Merremiif Wagl. ?, BouL, Peracca], Thainnodynastes 

 Nattereri^ Philodryas Schotti, Philodrgas psainmopliideus^ 

 Oxyrhopus rlwmhifer^ and Lachesis alternatus), 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- 

 bsenian is, without doubt, 



Lepidosternum affine^ Bottger. 



I do not consider L. J3oettgeri, Boul. Lizards, ii. p. 466, 

 from Corrientes, to be distinct from Bottger's species, and 

 probably both are identical with Strauch's L. Gilntheri. 



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 pri^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 Richettsiiy 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. 



