354 



NEW AFRICAN CHAM^LEUN STEJNEGER. 



Dimensions in millimeters. 



XT. S. National Museum numbers ; 



Total length from tip of suout to tip of tail 



From tip of snout to posterior end of mandible , 



From tip of snout to apex of casque 



Length of rostral process from base anteriorly. . 



Distance between tips of rostral processes 



Greatest width between lateral cranial crests . . . 



Tibia 



Tail 



16747. 



197 

 18 

 25 

 11 

 9 

 12 

 15 



107 



Until quite recently the liorned chamseleous of this particular group 

 were supposed to be confined to Madagascar only. In 1887, however, 

 Dr.Eeichenow described a Chamceleo Jischeri from some mountain region 

 in Central Africa, a species apparently related to Gh. Mfidus from Mada- 

 gascar. From this, as well as from all other two-horned chamoeleons 

 known to me, the present form differs at once by the total absence of 

 either a dorsal, gular, or ventral crest. Another notable feature in the 

 present species is the continuation of the superciliary crests into the 

 lateral crests of the horns. 



The collection brought home by Dr. Abbott and generously donated 

 to the Museum also contains four specimens of Chanueleo roperi, 

 recently described by Mr. Boulenger (P. Z. S., 1890, p. 85, pi. viii, fig. 

 4), from the same locality. I find the characters ascribed to this form 

 quite constant. 



Head of Chamcflco abbolii, seen from above. 

 About \\ times natural size. 



