376 On a new Chameleon from Uganda. 



LIII. — Description of a neio Chameleon from Uganda. 

 By Gr. A. BOULENGER, F.R.S. 



Chamceleon Jacksonii. 



Casque feebly raised, obtusely angular behind, with strong 

 tubercular parietal crest bifurcating in front ; the distance 

 between the commissure of the mouth and the extremity of 

 the occiput equals the length of the mouth ; postfronto- 

 squamosal crest strong, tubercular ; no canthus rostralis ; 

 interorbital region deeply concave ; male with three long, 

 conical, smooth horny processes, with circular striae, directed 

 forwards, one in front of each orbit and the third on the 

 snout ; the rostral horn much thicker, but not longer than 

 the orbitals ; no occipital lobes ; scales on the head unequal, 

 largest on the parietal region. Body and limbs covered with 

 granules of unequal size intermixed with small tubercles ; a 

 dorsal crest of large, distant, triangular, compressed tubercles ; 

 no gular or ventral crest. Limbs stout, rather short ; no 

 tarsal process. Tail as long as head and body. Dark olive, 

 with a whitish lateral streak. 



millim. 



Total length 122 



From end of snout to extremity of mandible .... 15 



„ „ „ casque 20 



Rostral horn 7 



Praeorbital horn 7 



Depth of skull (mandible included) 12 



Width of head 10 



Body 44 



Fore limb 27 



Hind limb 28 



Tibia 10 



Tail 60 



A single half-grown male specimen, presented by Mr. F. J. 

 Jackson to the British Museum. 



This chameleon agrees in its cephalic horns with the West- 

 African Ch. Oivenii, Gray, and the East-African Ch. dere- 

 mensis, Matschie. Jt differs from the former in the hetero- 

 geneous lepidosis, the posteriorly pointed casque with strong 

 crests, the absence of occipital lobes, the presence of a dorsal 

 crest, and the shorter tail ; from the latter in the presence of 

 a parietal crest, the absence of occipital lobes, of a dorsal crest 

 supported by produced neural spines, and of a ventral crest. 



