156 New Birds from Yucatan. 



IV. — Descriptions of supposed New Species of Birds of tlie 

 Families Tyrannidce, Cypselidce and Columbidce. 



BY GEORGE N. LAWRENCE. 

 Read December 1st 1884. 



1. Contopus aIbicolli§. 



Crown dark hair-brown ; back and upper tail-coverts dark olive-green ; 

 tail feathers dark liver-brown, the outer web of the lateral feather ashy, the 

 inner webs of all are edged with whitish, the ends of the tail-feathers are 

 just edged with dull wiiite ; the quills are blackish-brown, with their inner 

 margins of a very pale ochreous-white, the inner primaries are tipped with 

 whitish, the secondaries narrowly edged and ending with white, and the 

 tertiaries more conspicuously margined with white ; the wing-coverts are 

 dark-brown, largely ending with dull white, forming two bars across the 

 ■wings ; under wing-coverts dull pale ochreous intermixed with dark ash ; 

 chin and throat white, breast and sides of a rather light cinereous, abdomen 

 and under tail-coverts very pale j^ellow ; the upper mandible is black, the 

 under is of a light dull yellowish-brown, dusky at the tip ; tarsi and toes 

 black. 



Length, 6 inches; wing, 3.25; tail, 2.50; bill from front, 0.60: 

 tarsus, 0.50. 



Habitat, Yucatan. Collected by Geo. F. Ganmer. 



Remarks. — This does not require minute comparison with any 

 other species ; the white throat and generally pale colors of the 

 under plumage are distinguishing characters. 



2. Cheetura Yucatanica. 



The upper plumage is deep brownish-black, with the exception of the 

 rump and upper tail-coverts, which are dark ash-color with a wash of fuli- 

 ginous on the longer tail-coverts ; the tail-feathers are brownish-black, the 

 webs at the end tapering up to the delicate spines, where they are edged 

 with whitish ; wings black, the ends of the inner quills narrowly margined 

 with dull white ; lores black ; the chin, throat and upper part of the breast 

 are light ash, the lower part of the breast and the abdomen arc of a dark 



