XXVII. — Descriptions of New Species of Birds of the Genera 

 ChordeileS) Swainson, and Polioptila, Sclater. 



By Geo. N. Lawrence. 

 Read 22d December, 1856. 



Chordeiles giincllachii. 



Male. — The entire upper plumage is blackish-brown, having 

 the feathers margined and spotted with rufous, which is more 

 distinct and brightest on the crown and scapularies ; the lesser 

 wing coverts edged with bright rufous ; the greater wing coverts 

 and tertiaries, speckled with greyish- white and pale rufous ; 

 quills dark umber-brown, with a white transverse bar crossing 

 the middle of the first five primaries, except on the outer one, 

 where it is confined to the inner web, with a marginal spot of 

 white on the outer web ; tail dark brown, with a white sub- 

 terminal band, which crosses all, except the two central feathers, 

 on some of the feathers it does not quite extend to the edge of 

 the outer web, the tail is also crossed with narrow irregular 

 bars of pale rufous ; throat with a white triangular mark, below 

 which the feathers are dark-brown, with rufous tips; breast 

 pale rufous-white, crossed by very distinct bars of blackish- 

 brown ; abdomen and nnder tail coverts rather light rufous, 

 also with dark transverse bars ; on each of the under tail 

 coverts there is a sub-terminal spot of pure white succeeding 

 the black bar ; outer edge of the shoulder white ; inner wing 

 coverts barred alternately with pale rufous and brown ; bill 

 blackish ; tarsi and feet reddish-brown in the dried specimen. 



Female, young. — The entire upper plumage in this specimen 

 is dark brown, mottled with rufons, without any greyish tints ; 

 there is no distinct spot on the throat or white band on the 

 tail ; the white bar on the primaries is more restricted than 



DECEMBER, 1866. \<% Akk. Lyc. Nat. Hist. Vol. VI. 



