ART. 26. A NEW SPECIES OF AGAMID LIZARD COCHEAN. 3 



rounding scales. In G. ahhotti there are no enlarged scales on the 

 sides, unless two or three slightly larger scales on the left side may 

 be so interpreted. 



3. In all the specimens of G. cJiamaeleontinus at hand there is a 

 distinct trace of the supraorbital semicircle, appearing as a row of 

 4 slightly elevated scales. Between these two low ridges the scales 

 are very small, almost granular. In G. ahhotti there is not the 

 slightest trace of supraorbital semicircles, and the scales of the inter- 

 orbital region are not noticeably smaller than those elsewhere on 

 top of the head. 



4. In the new^ species the third and fourth fingers are of equal 

 length, while in G. cJiamaeleontinus the fourth finger is slightly longer 

 than the third. 



In comparing Gonocefhalus ahhotti with GonocepTialus doriae 

 Peters the resemblance is found to be much more close. 



Thus the new species agrees with G. doriae in lacking the scattered 

 enlarged scales on the back and the tubercles on the temporal region ; 

 in having the scales next to the nuchal and dorsal crest-spines large 

 and fiat, without keel or spine; and in having the third and fourth 

 fingers of equal length, points which, as shown above, distinguish it 

 from G. cJiamaeleontinus. On the other hand, it differs essentially 

 from G. doriae in the dorsal crest, which, instead of being "almost as 

 high as the nuchal," is much lower and gradually diminisliing from 

 where it joins the nucTial. The type and only specimen is a female, 

 and the crests are probably not developed to the same extent as in 

 the male, but judging from the differences between the males and 

 females in G. chamaeleontinus the median spines of the crests prob- 

 ably never reach a development equaling that shown in the latter 

 species. 



The new species is named for its discoverer. Dr. W. L. Abbott. 



o 



3136— 22— Proc.N.M.Vol.60 47 



