34^ Mr. Swainson on several new groups in Ornithology/* 



CRITHAGRA. 



Rostrum breve^ sub'Conicum^ crassum^ integrum ; culmine arcu» 



ato ; tomio curvato. 

 Ala sub-elongat<s ; remigibus l^a^ ^da^ ^tid^ et 4ta aqualibus^ 



longissimis. 

 Cauda mediocriSy sub-furcata. 



Bill short, sub-conic, thick, entire ; culmen arched ; commissure 

 curved. Wings lengthened ; the first, second, third, and fourth 

 quills equal and longest. Tail moderate, slightly forked. 



Types. Lox. sulphurata,Jlaviveniris, Lath. 



Africa only ? In the valuable collections of my friend Mr. 

 Burchell, are numerous examples of this form. 



SPERMOPHILA. 



Rostrum breve^ crassissimumy integrum ; culmine arcuato ; tomio 

 curvato. 



Ala breves, rotundata; remigibus l^^ et *7mfi aqualibus, lon- 

 gissimis. 



Cauda mediocriSy rotundata. 



Bill short, very thick, entire ; culmen arched ; commissure cur- 

 ved. Wings short, rounded ; the first and seventh quills equal 

 and longest. Tail moderate, rounded. 



Types. Pt/rrhulafalcirostris, dnereola. Temm., PI. col. p. 11. 



This is a South American group, and does not appear to ex- 

 tend further North than Mexico. Between the three last genera 

 a general similarity prevails in the shape of the bill, but in other 

 respects they are very different. 



AMMODRAMUS. 



Rostrum mediocre, validum, conicum, leviter emarginatum : tomio 



sinuato, basi angulato. 

 Ala breves rotundata ; remigibus Imd et 5'« aqualibus y ^da^ 2tid^ 



et 4<« aqualibus, longissimis* 



