148 Mr. Swainson on two new Genera of Birds. 



Male. Above greyish brown j throat, breast, and middle of the 

 body black ; sides and eye-stripe snowy ; tail graduated, 

 black, tipt with white. 



Female. Ferruginous brown above j sides of the body testaceous 5 

 middle tail feathers brown. 



Description. 



Size of the Wood-Wren. Bill black. The general tint of the 

 upper plumage in the male is grey; but in the female it is ferru- 

 ginous ; more particularly on the lower part of the back ; the 

 margins of the quill feathers are the same, the quills themselves 

 being brown. The sides of the head^ ears, and fore part of the 

 neck, and breast and bodi/, are covered by a large patch of black 

 •which extends to the rent ; and is margined on each side by a 

 ■white line, which passes over the eyes and ears, becomes wider 

 on the sides of the breast and body, leaving the Jlanks and belli/ 

 in the male pure white, but tinged with ferruginous in the female. 

 The -wings are very short, the covers are all black, marked by 

 snow white spots ; spurious quills the same. Tail lengthened and 

 cuneated ; the middle pair being more than an inch longer than 

 the outer pair; those which intervene are progressively graduated; 

 they are all black, with obtuse white tips, except the middle pair, 

 which are greyish towards their l^a§e. T^irsi moderate, slate 

 cploured. 



Total length, 4 1 inches; bill, y^^; wings not quite ?; tail, 2 1; 

 tarsi, |. 



Obs. I met with both sexes of this species in the Catinga woods 

 of Humildez. A specimen of the male is in the Cabinet of Mr. 

 Vigors. 



3. Formicivora brevicauda. 

 Short tailed Ant-Wren. 



F. cinerea; jugulo pectoreque nigris; scapulis maculisque tectrices 



ornantibus albis ; cauda brevissimd. 

 Cinereous, middle of the throat and breast black, shoulders and 



spots on the wing covers white j tail very short. 



