CROSSTTRUS PLATYURUS. 281 



scales, whilst on the under surface, may be observed large plates or 

 scutellae, the middle one being transversely elongated, constituting a 

 regular row, which extends near the extremity of that organ. 



The specimens before us are somewhat discolored : a greyish-brown 

 hue seems to have pervaded the upper regions, with small and darker 

 spots irregularly dispersed over the head, body, limbs, and tail. The 

 labial plates are dark brown, with a light marginal fillet. The infe- 

 rior regions are whitish, either unicolor or provided with a minute 

 dark spot or dot upon each scale. 



Loc. Oahu and Kauai, Sandwich Islands. 



GENUS CROSSURUS, WAGL. 



GEN. CHAR. Toes semipalmated, dilated upon their anterior extre- 

 mity, all provided with a nail ; plates, underneath, divided by a 

 median groove. No femoral pores. Tail depressed, provided beneath 

 with a series of large scutellae. 



SYN. Crossunis, WAGL. Naturl. Syst. Amph. 1830, 141. GRAY, Catal. Lizz. Brit. 

 Mus. 1845, 158. 



OBSERV. In accordance with Gray, we restore the genus Crossunis 

 of Wagler, and place in it a second species, which has been referred 

 to the genus Hemidactyhis by modern writers; and, still more recently, 

 was made the type of a distinct genus under the name of Platyurus. 

 Femoral pores are ascribed to the male sex of the latter genus: "a fact 

 which would establish another difference between it and Doryura, 

 which it approximates quite closely. The web at the base of the 

 toes, the presence of a nail to the thumb as well as to the fingers, the 

 absence of femoral and anal pores, and the depressed tail, are as many 

 characters which commend the genus Crossurus to our attention. 



CROSSURUS PLATYURUS, Grd. 



SPEC. CHAR. Sides of body and thighs provided with an expanded 

 membrane. Tail flattened, laterally thin and fringed. Greyish, 

 with black streaks and spots. 



Tl 



