Hirundinidce, Formicaridce. Tyrannidaz, etc. 401 



inner webs blackish, with their bases white, increasing towards the 

 outer feather, on which the white extends for two-thirds the 

 length ; the smaller wing coverts are of the same color as the 

 back, the larger coverts, secondaries, and tertiaries are broadly 

 bordered with white, appearing like a large and distinct patch 

 on the wing ; entire under plumage pure white ; bill and feet 

 black. 



Length of skin, 5£ in. ; wing, 4 ; tail, 2 ; bill, from front, ^ ; 

 width at gape, f ; tarsi, f . 



Habitat. — Ecuador, Quito. 



Remarks. — In appearance most like H. albwentris from 

 Brazil ; but is of a lighter green, with no bluish shade, except 

 slightly on the crown ; the wings and rump are more conspi- 

 cuously white, the latter having twice the extent of that color 

 existing in H. albiventris. The latter species is rather larger, 

 with a very much broader bill, and the outer edges of the 

 inner secondaries only narrowly bordered with white. 



Fam. foumicaeid^e. 



2. Thamiiopliilus leucopygus, nov. sp. 



Male. The upper part and sides of the head, including the eyes, 

 and the upper part and middle of the back, glossy black ; lower 

 part of back and rump pure white ; upper tail coverts and tail 

 black, the latter narrowly ending with white ; wings black, the 

 quills narrowly margined with white, the outer webs of the sca- 

 pulars and the ends of the middle wing coverts broadly white, 

 the larger coverts have their outer margins narrowly white, and 

 their ends more broadly so; entire under plumage soiled white, 

 the cheeks, chin, lower part of the abdomen, and under tail coverts, 

 purer, the neck, breast, sides, and abdomen, ashy ; bill black ; tarsi 

 dull plumbeous brown. 



Length about G£ in. ; wing, 3| ; tail, 3 ; bill, \ \ ; tarsi, f|. 



