86 Mr. Gray on new Reptiles from Australia, XL — Description of some new Species and four new Genera of Reptiles from Western Australia, discovered by John Gould, Esq. By J. E. Gray, Esq., F.R.S., &c. To the Editors of the Annals and Magazine of Natural History. Gentlemen, Mr. Gould having kindly placed in my hands the collection of Reptiles which he made during his visit to New Holland to gather materials for his ^ History of the Birds of Australia,^ I have sent you the description of the following species, which appear to be new to science. The two r.ew genera are very in-teresting ; the one, Ronia, being exactly intermediate in orga-nization between the two-legged and the four-legged Seines ; and the other, Moloch, for its extraordinary appearance and grotesque forms. I may remark, this collection contains two specimens of Soridia lineata, Gray, which MM. Dumeril and Bibron have accused me of erroneously describing as an Australian animal. (See ^ Erpetologie Generale,' v. 787-) I believe that this has arisen from M. Bibron supposing all the Reptiles that he saw at the Chatham Museum to be from the Cape of Good Hope ; whereas that collection is very rich in Australasian Reptiles. Chelomeles of MM. Dumeril and Bibron appears to be very nearly allied to Soridia, and should most probably be arranged with it in the family of Rhodonidce. Mr. Gould's specimens of Delma having enabled me to ex-amine more minutely the characters of that genus, I am now convinced that it should be referred to the family PygopidiS. It chiefly differs from the genus Pygopus in the small size of the rudimentary feet and in the absence of the pre-anal glands. The genus Lialis, which heretofore has been placed with Pygopus, appears to be the type of a new family. It, Delma and Pygopus are all found in Western Australia, as is also the genus Aprasia, which ought, in my Catalogue of Slender-tongued Saurians (Ann. Nat. Hist. vol. i. and ii.), to have been arranged with the Apodal Seines. On examining Mr. Gould's better-preserved specimen, I am inclined to consider it also as the type of a family characterized by the shields of the head and the position of the nostrils, to which, most probably, MM. Dumeril and Bibron's genus Brachymeles will also have to be referred. These genera will then range thus : — Fam. LiALisiD^ : — Lialis. Fam. PYGOPiDiE : — Pygopus, Dehna. Fam. Rhodonid^ : — Rhodona, Soridia, Chelomeles. Fam. Aprasiad^ : — Aprasia, Brachymeles.