428 



REVIEW OF AMERICAN BIRDS. 



[part I. 



myiadestes unicolor. 



Myiadestes unicolor, Sciatee, P. Z. S. 1856, 299 (Cordova) ; 1857, 5, 

 213 (Orizaba) ; 1S58, 97.— Ib. Catal. 1861, 47, no. 289.— Sclateb 

 & Saltin, Ibis, 1860, 397 (Cobau). 



Hab. Central Mexico and Guatemala. 



(No. 22,377, 9 , type.) Second quill rather shorter than 7th ; 4th and 5th 

 longest, and about equal ; 1st about one-third the longest. 



General color dark slate color, paler below (darkest on jugulum and breast) ; 

 chin and anal region lighter. Eyelids white ; lores and cheeks dusky. Tail 

 feathers black, except central, which are like the back, the outermost which 

 is ashy except at base, and the second feather which has the end and a portion 

 of inner web ashy, the extreme tips of the two last mentioned feathers whitish. 

 Quills with a band of dull fulvous across their bases, shown very obscurely 

 externally as a transverse wing-bar, followed by a blackish one. Bill black; 

 legs hazel. 



(No. 22,377, 9.) Total length, 7.50; wing, 3.80; tail, 3.70; difference be- 

 tween outer and fourth tail feathers, .50 ; diflference between 10th and longest 

 quills, .85 ; exposed portion of 1st primary, 1.00, of 2d, 2.50, of longest (4th) 

 (measured from exposed base of 1st primary), 3.00 ; length of bill from fore- 

 head, .60, from nostril,.. 30, along gape, .76; tarsus, .85 ; middle toe and claw, 

 .80, claw alone, .22 ; hind toe and claw, .60, claw alone, .26. 



This species in form resembles M. obscurus, although in colora- 

 tion is more like townsendii, from which the prevailing dark slate 

 (not grayish-ash), and the absence of the distinct cinnamon bars 

 across the quills readily distinguish it. The pattern of coloration 

 of quills is as in townsendii, but the want of contrast in the tints 

 renders this almost inappreciable in the prevailing dark slaty plumbe- 

 ous of upper parts. The axillars and inner lining of wings are slate, 

 like the breast ; but the pale fulvous band at base of quills is very 

 well marked in the inside of wing. 



