Neiv Species of Birds from Yucatan. 273 



XIII. — Characters of Two supposed Neiv Species of Birds from 



Yucatan. 



BY GEORGE X. LAWRENCE. 



Read November 23, 1885. 



Polioptila albivcniris. 



Male. Front and crown of a glossy jet black, this color extending on the 

 sides of the head as far as upon a line with the middle of the eye ; entire 

 upper plumage of a clear light plumbeous; two middle tail-feathers black; 

 the first outer tail-feather is white, black on the inner web for a short dis- 

 tance from the base, the next is black for half its length, w T ith the terminal 

 portion white, the third feather is black for most of its length, ending 

 with white, the fourth feather is black tipped with white; the primaries 

 and secondaries are blackish-brown, very narrowly edged with white ; the 

 tertiaries are of the same color and have broader white margins ; the under 

 wing-coverts are white ; third and fourth quills longest and equal ; the 

 under plumage is entirely white ; the feet are dark plumbeous ; the bill 

 black. 



Length, 3 75 inches ; wing, 3.85 ; tail, 1.75 ; tarsus, .75 ; bill, 40. 



Habitat, Temax, Yucatan. Type in my collection. 



Remarks. — Mr. Gaumer sent a single specimen of this species, 

 which he thought might be P. nigriceps. It differs however 

 from that species in being smaller; in the black of the crown 

 being more restricted, not extending on to the occiput ; and 

 in the color of the upper plumage, which is of a clearer and 

 lighter plumbeous, while its under plumage is of a purer white. 



Cli ret lira peregrinalor. 



The upper plumage is smoky-black ; the rump and upper tail-coverts are 

 dark ash-color, the feathers of the latter with a very narrow edging of 

 whitish ; the tail-feathers are blackish-brown, with their shafts black ; the 



