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, 

 narrower 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 

 inwards 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 denti- 

 culate, converging towards the median line ; 36 to 39 scales between 

 the occipital shield and the base of the tail ; 8 or 9 scales corre- 

 spond to the length of the shielded part of the head ; lateral scales 

 graduating into the dorsals and ventrals, directed obliquely upwards 

 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 extre- 

 mity 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, with a black uninterrupted collar, which may be 

 more or less distinctly edged with 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. 



