46 On a new Engyslomilld Frog from Namaqualand. is similar to that of L. longuumdata, so is the sliape of the posteriorly narrowed frontal siiield, with truncate antero-lateral angles, and the coloration, as described and figured by Werner, is highly suggestive of some examples of that species. The three shields behind the nostril (" postnasals " of Werner) cannot be regarded as a generic character, especially in view of the well-known variability of these shields in the type species of the genus Lacerta. Nor can generic importance be ascribed to the scaling of the lower eyelid if we bear in mind the modifications which it undergoes within the limits of the genera Lacerta and Eremias. VI. — Description of a new Engg^toniatid Frog of the Oenns Breviceps from Nanaqualaud. By G. A. JBoulengER, F.R.S. [Plate II.] Breviceps macrops. (PI. II.) Head comparatively larger and body less gibbose tlian in B. gibbosus and allies, eyes much larger, their diameter Gi to 8 times in the length of head and body ; interorbital space narrow, barely half the width of the upper eyelid. Digits shorter and thicker than in the other species of the genus ; first and second fingers equal, twice as long as the fourth, a little shorter than the third, which is not longer than the eye ; toes extremely short, increasing in length from the rudimentary first to the fourth, which is not longer than the third finger, the fifth as long as the second ; subarticular tubercles very small, very feebly prominent under the fingers, Lower aspect of hand and foot. absent under the toes ; two large, feebly prominent metatarsal tubercles, the inner longer than its distance from the extre-mity of the first toe. Body with small smooth warts above, limbs and lower parts smooth. Pale sand-colour above, with
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