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Show 1894.] COLLECTION IN THE NATURAL-HISTORY MUSEUM. 729 UROCENTRUM GUENTHERI. (Plate XL VII. fig. 3.) Snout short, rounded; nostril directed upwards; upper head-scales with small granular asperities; a series of four or five large transverse band-like supraoculars, separated from the supraciliaries by a single series of very small scales; occipital longer than broad, narroAver than the supraocular region ; four or five upper and five lower labials; ear-opening as large as the eye-opening, without denticulation on its anterior border. Sides of head plicate ; second gular fold strongest. Lateral and anterior dorsal scales very small, granular, smooth; posterior dorsal scales larger, smooth or very obtusely keeled ; ventrals larger, squarish, feebly imbricate, smooth. Digits slender. The adpressed hind limb reaches the axilla. Tail shorter and narrower than the body, flat inferiorly, twice as broad as deep, with whorls of very large, obtusely keeled, spinose scales, the spines strongest on the sides. Head and nape bluish grey, back and limbs pale olive; head spotted with black; nape and anterior part of back with curved black cross-bands; posterior half of body with a wide-meshed black network; belly greenish white. millim. millim. Total length 122 Fore limb 32 Head 18 Hind limb 38 Width of head 11 Tail 34 Body 70 A single female specimen from Tquitos, Peru. SCELOPORUS BULLERI. (Plate XLVIII. fig. 3.) Head moderate; snout much flattened. Head-shields smooth ; a series of four large, transversely enlarged supraoculars, bordered hiAvards by one series of small scales ; two canthal scales; occipital (interparietal) as long as broad or longer than broad, much larger than the parietals; four or five pointed scales form a denticulation on the anterior border of the ear. Dorsal scales much larger than ventrals, a little broader than long, keeled, mucronate and denticulate, converging towards the median line; 36 to 39 scales between the occipital shield and the base of the tail; 8 or 9 scales correspond to the length of the shielded part of the head; lateral scales graduating into the dorsals and ventrals, directed obliquely upAvards and backwards; ventrals smooth, bi- or tricuspid; 41 or 44 scales round the middle of the body. The adpressed hind limb reaches the shoulder or the ear; tibia as long as the shielded part of the head; the distance between the base of the fifth toe and the extremity of the fourth equals the distance between the end of the snout and the ear. 15 to 18 femoral pores on each side. Caudal scales as large as dorsals. Male with enlarged postanal scales. Dark olive above, Avith a black uninterrupted collar, which may be more or less distinctly edged Avith yellowish or greenish; sides of belly dark blue, black-edged, in both sexes; a patch of blue may be present on the throat, the greater part of which is black or dark olive. |