240 
Trcmsactions of fhe Bnyal Society of South A frica. 
very slendei-, a little longer or a little shorter (§ to 1| times) than head 
and body. 
Measurements (in millimetres) : 
1. 
2. 
3. 
4. 
From snout to vent 
Ill 
92 
83 
71 
Head 
27 
23 
21 
19 
Width of head . 
27 
23 
21 
20 
Depth of liead 
17 
16 
14 
12 
Diameter of eye -cleft . 
5 
4-5 
4 
4 
,, ear-openino- 
o 
O 
2-5 
2-5 
2-5 
Fore hm1) 
54 
49 
42 
37 
Hand 
19 
16 
15 
14 
Hind limb .... 
73 
62 
55 
51 
Tibia 
27 
21 
20 
18 
Foot 
27 
23 
21 
20 
Tail 
. 129 
82 
90 
63 
1. , Little Namaqualand. 2. $, Little Namaqualand. 3. , Deel- 
fontein. 4. ? , S. Africa (type). 
Lepidosis. — Upper parts rough with enlarged spinose scales as in 
A. hispida, but not so plentiful, more as in an average A. aciileata, the 
smaller scales strongly keeled and mostly mucronate ; the largest spinose 
scales forming 3 or 4 longitudinal series on each side of the back ; 80 to 
90 scales round middle of body ; the largest spinose scales near the 
ear-opening as long as or a little shorter than the diameter of the latter 
(shorter in the young) ; vertebral crest very low but distinct on the nape, 
just indicated or interrupted, on the back. Upper head-scales unequal, rough, 
keeled or subconical, sometimes smooth on the snout and over the eyes, a 
few enlarged in the middle of the snout ; some enlarged trihedral scales just 
behind or partly surrounding the enlarged occipital ; the pineal foramen in 
the centre of a pit which may be shallow or deep and crater-like as in A. 
hispida; 11 to 15 scales across the head, from one superciliary series to the 
other; 11 to 15 upper labials on each side ; 3 to 5 series of scales between 
the upper labials and the nasals. Grular and ventral scales smooth or faintly 
keeled, sometimes shortly mucronate. Scale at the base of the claw, on 
the dorsal surface of the toes, uni- or tricarinate and not, or but little, 
longer than the others ; subdigital scales spinose, 14 to 18 in a longitudinal 
series under the third or fourth toe. Caudal scales strongly keeled, more 
or less distinctly mucronate, not forming whorls, equal except at- the base. 
Scales on upper surface of tibia very unequal in size. 
Male with a single row of rather small preanal pores. 
Coloration. — Yellowish or greyish brown above, large males greenish 
plive, females sometimes reddish brown, with two or four longitudinal and 
