Mr. Swainson on several nexo groups in Ornithology. 355 



Ala: brevissimcE^ rofunilafce. 



Cauda nicdiocris, lata, gradata ; rcctricibus mb-rigidis, abrupte 

 acumitiatis. 



Bill moderate, slender, straight, compressed, entire ; culmen 

 slightly arched. JVitigs very short, rounded. Tail moderate, 

 broad, graduated ; the feathers rigid, and ending abruptly in 

 naked points. 



I believe no species of this form has been described : it occurs 

 in the tropical latitudes of America. The feet are rather large 

 and tolerably strong ; but the hind toe is not particularly de- 

 veloped. The habit of the whole bird resembles that of a Si/lvia. 



SITTASOMUS. 



Rostrum gracile, parvum^ rectum^ fere emarginatum ; culmine 



leviter arcuato. 

 Ala mediocres. 

 Cauda sub-elongata ; rigida. 



Bill small, slender, straight, slightly notched ; culmen rather 



curved. Wings moderate. Tail lengthened, rigid. 

 Type. Deud. sylviellus. Temm., PI. col. 72. f . 1 ? 



By this form the genera Oxyurus and Xenops appear to be 

 brought together. It possesses the rigid scansorial tail of Den- 

 drocolaptes, and the more feeble bill of Xenops. 



Suh-family Tichodromina ? 



LOCHMIAS. 



Rostrum mediocre., gracile, compressum, sub-arcuatum, integrum. 

 Alee breves, rotundatce ; rcmige Im^ brevi; 3'«a, 4'^', et bi<i sub' 



tequalibus, longissimis. 

 Cauda inediocris, lata, rotundata, debilis. 

 Pedes graciles ; tarsis elevatis, squumis anterioribus infrequenti- 



bus, lateralibus obsolelis, posteriuribus frcquentibus, parvis j 



hallucc digito medio breviore, ungue curvato. 

 z 2 



