PHRENOTRIX TEMIA. 



explain the considerations by which I have been guided, to represent in the Plate of 

 Illustrations, a comparative view of the bill of Phrenotrix in letter N. a. & b. ; of 

 Corvus Pica in letter O. a. & b. ; and of Corvus senegalensis in letter P. Phrenotrix 

 is distinguished by an elevated, regular, and smooth bill, gradually tapering to a 

 rounded keel, equally arched from the base to the point, and by a thick velvet-like 

 border which surrounds the bill and orbits : the nostrils also have a very peculiar 

 form and disposition. The Senegal crow has a similar diposition of the nostrils ; but 

 the bill, although smooth, regular, and arched, is more lengthened, and the culmen 

 comparatively sharp. No traces of the velvet-like border exist, but the base of the 

 bill is entirely without that peculiar character which is observed in Corvus Pica. 

 Here it is covered by numerous, very stiff, decumbent, jagged bristles, pointing 

 directly forward far beyond the nostrils ; the latter are perfectly circular in a gradually 

 narrowed depression. The form of the bill is lengthened, the arch less prominent, 

 and it has a distinct terminal notcli, which in Phrenotrix and in Corvus senegalensis 

 is very obsolete. 



