IN 1933,1 I referred a specimen of Anolis from the high mountains of Guerrero between Rinc6n and Cajones to the species gadovii. Since then I have had the opportunity of examining a specimen of gadovii, and it is now obvious that the differences pointed out originally (op. cit.) define another species, which may be called Anolis dunni, new species HOLOTYPE.-Taylor and Smith Collection No. 1506, collected July 1, 1932, on a boulder in the high mountains, within the evergreen zone, between Rinc6n and Cajones, Guerrero. DIAGNOSIs.-Resembling Anolis gadovii Boulenger, in most characters, differing in possessing widely separated, narrow and ill-defined frontal ridges; nares vertically compressed; supraorbital semicircles broadly in contact, separated from the supraoculars by a single series of scales; a large, single series of scales between the occipital plate and the supraorbital semicircles; dewlap reddish.