244 



U. S. NATIONAL MUSEUM BULLETIN 206 



Crossodactylus aeneus TL. Miiller 



Plate 22, Figures a, b 



1924. Crossodactylus aeneus L. MIjller, 1924a, p. 171 (type locality, Barreira, 



near Teres6polis, Rio de Janeiro) ; 1927, p. 272. 

 1931. Crossodactylus gaudichaudii (not of Dum^ril and Bibron) A. Lxjtz, pp. 



228. 238. 



Description.' — Adult male, USNM 97692, Guapi, Teres6polis, Rio 

 de Janeiro. A slight, continuous, V-shaped vomerine ridge in front 

 of and between the choanae, with a few widely spaced toothlike 

 projections; tongue a little more than one-half the width of mouth 

 opening, oval, not notched or free posteriorly; snout rounded when 

 seen from above and in profile, upper jaw extending considerably 

 beyond lower; nostrils more lateral than superior, scarcely projecting, 

 midway from eye to tip of snout, separated from each other by an 

 interval equal to 1% their distance from eye. Can thus rostralis dis- 

 tinct; loreal region vertical, the upper lip flaring slightly beneath it. 

 Eye large and prominent, its diameter equal to its distance from end 

 of snout; interorbital diameter 1% times the width of upper eyelid, 

 about four-fifths the distance between nostrils. Tj/mpanum large 

 and distinct, one-half the diameter of eye and separated from eye 

 by an interval less than one-fifth of its own diameter. Fingers free, 

 their tips slightly dilated, the median furrows not readily distin- 

 guishable on top of fingers, but very apparent on toes, fourth finger 

 longer than second, reaching to antepenultimate phalanx of third; 

 narrow marginal fringes along sides of fingers; a large oval palmar 

 tubercle and a smaller one at base of first finger; a patch of five 

 subequal, black spines on outer side of first finger; subarticular tuber- 

 cles prominent, single; toes webbed at base, with wide lateral fringes 

 and distinct terminal disks, third toe much longer than fifth, reaching 



