430 



REVIEW OF AMERICAN BIRDS. 



[part I, 



(No. 16,168.) Fresh specimen : Total length, 8.10 ; expanse of wing, 13.20 ; 

 wing from carpal joint, 4.50. Prepared specimen : Total length, 8.00 ; wing, 

 4.40 ; tail, 4.40, depth of fork, .42 ; difference between 10th and longest pri- 

 mary, 1.22; exposed portion of 1st primary, 1.00, of 2d, 3.00, of longest, 4th 

 (measured from exposed base of 1st primary), 3.45 ; length of bill from fore- 

 head, .60, from nostril, .30, along gape, .71 ; tarsus, .80 ; middle toe and claw, 

 .80, claw alone, .24; hind toe and claw, .50, claw alone, .26. 



On the chin and crissum the tips of feathers are much lighter 

 than the ashy bases, producing a mixture of the two colors, although 

 this is scarcely appreciable in some specimens. There is a very 

 faint indication occasionally of a dusky line on each side of the chin, 

 as in M. obscurus. 



Young birds have a large triangular pale ochraceous light spot on 

 the end of each feather (rather paler below), bounded externally by a 

 narrow border of blackish ; the quill- and tail-feathers as in the adult. 



The more important localities of specimens before me are as 

 follows : — 



(2,922 ) Type of species. 



Myiadestes otoscurus. 



Myiadestes obscurus, Lafr. Rev. Zool. 1839, 98 (Mexico).— Sclater, 

 P. Z. S. 1856, 300 (Guatemala) ; 1857, 5, 213 (Orizaba) ; 1859, 

 364 (Jalapa) ; 376 (Oaxaca; eggs).— Ib. Catal. 18G1, 47, no. 288.— 

 Bon. Consp. 336.— Sclater & Salvin, Ibis, 1, 1859, 14 (Guatemala). 

 Eah. Mountainous regions of Mexico, into Guatemala ; Tres Marias Islands. 

 (No. 37,500.) Wing about equal to tail, which is emarginate and rounded. 

 Fourth quill longest ; 5th and 3d a little shorter ; 2d longer than 7th ; 1st two- 

 fifths the 2d. 



Back olivaceous-rufous, more olive on rump and upper tail coverts ; the 

 outer surface of wings, including edges of quills, more rufous cinnamon. A 

 pale cinnamon concealed patch at base of inner webs of quills, abruptly de- 

 fined on the secondaries, fading out gradually in the primaries along their 

 inner edges. Head, neck, and under parts plumbeous-ash (the latter less 

 pure). Chin (fading out gradually into the ash of throat), sides of lower 

 mandibles (separated from chin by a black line), and line from nostril to 

 above eye, with middle of belly, dull white ; eyelids pure white, the loral 

 region dusky, the cheeks below the eye blackish. Tail black, excepting 



