228 THE REPTILES OE EGYPT. 
it is nearly straight backwards, while in others the anterior curvature may be great. 
Gravid females with the parietal crest almost sessile, or more or less recumbent, 
correspond to the Cameleon trapu of Is. Geoff. St.-Hilaire. The occipital lobes also 
vary considerably in the degree of the backward convexity, but they are never absent. 
The length of the tail may sometimes fall considerably short of the distance between 
the snout and the vent, while in others it may exceed it. 
The number of enlarged granules on the body is liable to vary, also the size of the 
tubercles on the head and on the occipital lobes. 
Chameleon calyptratus, A. Dum. (Plate XXX.) 
Chamtsleo calyptratus, A. Dum. Cat. Rept. Paris Mus. 1851, p. 31 & ftnote p. 33 ; Arch. Mus. vi. 
1852, p. 259, pi. xxi. fig. 1 ; Peters, Sitzb. Ges. naturf. Ereunde, 1882, p. 43 ; Blgr. Cat. Liz. 
B. M. iii. 1887, p. 446; Mocquard, C. R. Soc. Pliilom. no. 12, 1895, p. 36; Anderson, Herp. 
Arabia & Egypt, 1896, p. 62. 
Casque very large, greatly elevated posteriorly, with a strong anterior convexity, but 
slightly concave posteriorly ; a rather feeble occipital dermal lobe on each side, but not 
continued to the apex of the casque ; supraorbital ridge not ascending upwards along the 
casque ; the distance between the angle of the mouth to the apex of the casque equals 
that between the tip of the snout and the shoulder ; the distance from the base of the 
casque, anteriorly, to its summit equals the distance between the tip of the snout and 
the front of the shoulder. Limbs well developed ; a tarsal spur in the male. Tail 
longer than the head aDd body. Sides of the head and casque with large polygonal 
flat scales, those along the margins of the casque more or less conical, and largest 
along the free border of the occipital lobes. Body with small tubercles separated by 
minute granules. A dorsal ridge of large, conical, backwardly pointed tubercles, largest 
on the anterior third of the back, becoming smaller behind, but more or less prolonged 
on to the tail. A gular ridge of triangular, sharply pointed, sickle-shaped lobules, 
diminishing in size on the two posterior thirds of the body. 
General colour of an adult male from Yemen, in alcohol, olive-green ; a black band 
from the apex of the casque along its sides to above the eye ; a narrow black band 
behind the eye to the angle of the mandible ; a series of large, irregularly shaped, 
blackish spots on the sides arranged more or less in two longitudinal series ; a black 
area from behind the mandible to the ventral crest and over the shoulder ; about 20 
broadish dark bands on the tail; dorsal and ventral crests whitish. 
One of the females from the Paris Museum is olive-grey, with a yellow lateral band 
above the shoulder margined with blackish, and another from the axilla to near the 
groin. The head-markings are the same as in the male. 
