i8S8.] Brewster, Nczv Subspecies of Mexican Birds. I ?y 



Mitrephanes phaeocercus tenuirostris, new subspecies. — Slender-billed 

 Flycatcher. 



Subs. Char. Similar to M. phceocercus but with the general coloring 

 paler, the bill shorter and very much narrower. 



$ ad. (No. 14,150, collection W. Brewster, near Oposura, Sonora, Mexico, 

 June 7th, 1SS7; J- C. Gaboon, No. 1129). Above brownishdrab, the wings 

 and tail nearly uniform with the back and crown but perhaps a shade 

 browner; middle and greater wing-coverts tipped with white, forming 

 wing-bands; forehead tinged with ochraceous; lores dusky; a narrow 

 orbital ring of buffy white; a band or half collar passing around the hind 

 neck, sides of neck, auriculars, cheeks, bend of wing, under wing-coverts, 

 and remainder of underparts clay color, palest on throat and under 

 tail-coverts, deepest — somewhat ochraceous — on the breast, under wing- 

 coverts, and sides of neck. Length,* 5.45 ; extent, *S. 50; wing, 2.72; tail, 

 2.42 ; bill : length from base, .45 ; length from nostril, .25 ; width at nostril, 

 .20. 



Habitat. Western Mexico (Sonora, Mazatlan). 



The National Museum collection contains eight specimens 

 labelled M. phceocercus., one from Guatemala, one from Coban,. 

 three from Orizaba, two from Mazatlan, and one marked simply 

 Alexico. Of these the first five may be referred confidently to 

 phceocercus (the Guatemala specimen, from the collection of 

 Messrs. Salvin & Godman, is marked "compared with type"). 

 Of the remaining three one (No. 51,506, Mazatlan, Feb. 186S ; 

 F. Bischoft') has an even smaller bill than the type of teitiiirostris. 

 Although somewhat deeper colored it doubtless belongs to the 

 same form. The two remaining birds have broader bills and 

 still deeper coloring and are probably intermediate between 

 phccoccrctis and tenuirostris. 



Dendroica aestiva sonorana, new subspecies — Sonora Yellow 

 Warbler. 



Subs. Char. $ most nearly like J D. ce. morcomihut with the under- 

 parts even more faintly and sparsely streaked, the upperparts, especially 

 the rump, wings and tail much yellower, the light (yellowish) edging of 

 wing-quills and coverts broader, the interscapulars with more or less 

 conspicuous shaft-stripes of purplish chestnut; $ much paler and grayer 

 than the $ of either cBstiva or morcomi. 



(J ad. (No. 14,151, collection W. Brewster, Oposura, Sonora, Mexico, 

 April 7, 1887; J. C. Cahoon, No. 559). General coloring rich gamboge 

 yellow, deepest beneath, tinged with brownish orange on the crown, with 



* Collector's measurements of fresh bird. 



