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Show 240 MR. A. W. E. o'SHAUGHNESSY ON [Feb. 1, scales and in the single lateral series of large scales. M. Bocourt's description particularizes " deux rangees longitudinales de chaque cote de la crete dorsale;" and his figure of the general scutellation of the sides indicates about 29 scales vertically between the belly and the dorsal crest, and larger scales intermixed with these everywhere. Sexual characters are well shown in the series of specimens before me. The male has a larger head and longer hind limbs, reaching to the eye, while in the female they do not extend beyond the tympanum. A different system of coloration also prevails, the female being of darker brownish and more variegated tints and without the dark gular patch. 16. ENYALIUS PR.ESTABILIS, sp. n. (Plate XXV. fig. 1.) Head broad, with rounded and projecting lateral border of about 20 canthal and superciliary scales in a continuous series, almost uniform in shape and size. Entire upper surface of the head covered with very convex or pointed and erect scales, larger in the crescentic series bordering the supraorbital region ; larger conical scales above the temporal region. Supralabials 10, infralabials 9, uniform. Gular scales convex, elongate, the central erect. The back and sides of the body are covered with small almost uniform pointed and keeled scales, from 34 to 40 in a vertical series between the abdominal scales and the dorsal crest. Only a single very indistinct lateral series of larger scales on each side. A longitudinal crest of conical erect scales from the nape, along the median line of the back, and continued anteriorly on the tail, where it gives place to a double row or keel of pointed scales. Scales of the ventral surface small, uniform, smooth on the chest, and very feebly keeled on the middle of the abdomen; of the limbs small and keeled. A single femoral pore in a large scale on each side. Tail compressed, ringed with small keeled scales on the sides and larger beneath. Female with a shorter head than the male, and considerably larger scales on the sides of the body. The male also has the tail much thicker at its root and longer hind limbs, reaching to the eye, while those of the female reach only to the anterior border of the ear-opening. Ground-colour of the upper regions of the body, in the male, reddish, very finely speckled with green ; posterior gular region and gular fold black ; lower surfaces yellowish. The female has the ground-colour above dark brown, thickly dotted over with green; tail brown- and yellow-ringed; lower surfaces yellowish, without gular patch. A yellow spot on a patch of conical scales behind the ear in both sexes. millim. Total length (of male) 318 Distance between end of snout and ear-opening. . 34 ,. ,, ,, fore limb .. 56 >> y, „ vent 126 |