ARDEID^. 327 



coloured. The beak is of a singular form ; its upper 

 mandible is furnished with fine lamellae on the edge : 

 it is Tery strong, a little arched at the base, which 

 is elevated by an obtuse culmen, covered, as well as 

 the chief part of both mandibles, by a wrinkled skin : 

 the sides of the mandibles are compressed and in- 

 flected : the throat, and part of the space between 

 the beak and eyes are naked. 



GENUS CCCXXXVL— .TANTALUS, Linne. 

 Generic character : vide Steph. v. xii. ]. p. 1. 



GENUS CCCXXXVIL— IBIS, La Cepede. IBIS. 



Falcinellus, Beckstein. 



Generic character : vide Steph. v. xii. \. p. 6- 



Ibis plumbeus. Temm. PL Col. 235. 



Ib. ccerideo-piumbeus , pennis occipitalis et nuchalis medio albidis; 



fronte fascia alba. 

 Leaden-blue Ibis, with the feathers of the occiput and nape whitish 



in the middle ; the forehead with a white band. 

 Curucan de coleur de plomb. D'Azara. 



Inhabits Paraguay. Length twenty-seven or 

 twenty-eight inches : the feathers of the nape and of 

 the occiput are straight and pointed, and measure 

 near four inches in length : from the base of the beak 

 is a naked space which communicates with that sur- 

 rounding the eyes : a broad white band covers the 

 forehead, and extends above the eyes : the other parts 

 of the body, the head, and the neck, are of a beautiful 

 ashy-blue or leaden hue ; except the feathers of the 

 occiput and the nape, which are whitish in the middle : 



