1901.] ON NEW CHAMELEONS FEOM BRITISH BAST AEEICA. 135 



4. Descriptions of two new Chameleons from Mount 

 E-uwenzori, British East Africa. By G. A. Boulenger, 

 F.R.S. 



[Eeceived May 6, 1901.] 



(Plates XII. & XIII.^) 



The already long list of East- African Chameleons has receatly 

 been enriched hj the discovery of two most strikingly new species 

 represented in Sir Harry Johnstons collection, which I have been 

 authorised to describe. Examples of these new species were 

 obtained on Mount Euwenzori at an altitude of 6000 feet, together 

 with specimens of 0. ellioti, Gthr. 



Chameleon xenokhinus. (Plate XII.) 



Casque elevated posteriorly, very much in the male, with 

 strong, curved parietal crest ; the distance between the commissure 

 of the mouth and the extremity of the casque equals the length 

 of the buccal cleft in the male, a little less in the female ; lateral 

 crest distinct all round the head, strong and tubercular ; upper 

 head-scales large, unequal in size ;. interorbital region concave ; 

 the snout of the male terminating in two large compressed 

 bony processes directed forward and slightly upward, closely 

 appressed, fused together at the base, nearly twice as long as deep; 

 in the female, the processes replaced by two ver}^ small tubei'cular 

 knobs ; no trace of occipital lobes. Body covered with rather coarse 

 granules, intermixed with numerous feebly enlarged flat tubercles. 

 A feeble dorsal crest in the male, barely indicated in the female ; 

 no gular or ventral crest ; enlarged flat tubercles on the side of 

 the throat. No tarsal process. Tail longer than head and body, 

 not crested. Male uniform dark olive, the rostral appendage and 

 part of the tail lighter. Eemale purplish brown, with a large 

 blackish, light-edged blotch on each side of the body. 



millim. millim. 



Total length 240 197 



Erom end of snout to extremity of 



mandible (rostral process excluded) . . 25 21 



From end of snout to extremity of 



casque 



38 25 



Length of rostral appendage 14 — 



Greatest width between lateral cranial 



crests 16 13 



Depth of skull (mandible included) 26 16 



Width of head 16-5 14 



Body 75 66 



Tibia 17 15 



Tail 140 110 



Two specimens, male and female. 



This species stands nearest to G. fischeri, Reichen. 



^ For an explanation of the Plates, see p. 136. j 



