BIEDS OF NORTH AND MIDDLE AMERICA. 181 



KEY TO THE SUBSPECIES OF PREMNOPLEX BRUNNESCENS. 



a. Throat more rufescent; general color darker, with black margins to feathers of 

 under parts broader. 

 h. Throat paler (ochraceous to tawny-ochraceous). (Central to northwestern 



Colombia.) Premnoplex brunnescens brunnescens (extralimital.)« 



hh. Throat darker (deep tawny-ochraceous to rufous-tawny.) (Santa Marta dis- 

 trict of Colombia.) Premnoplex brunnescens coloratus(extralimital).& 



aa. Throat paler (buff to ochraceous-buff ) ; general color ])aler, with black margin to 

 feathers of under parts narrower. (Costa Rica and Panamii.) 



Premnoplex brunnescens brunneicauda (p. 181). 



PREMNOPLEX BRUNNESCENS BRUNNEICAUDA (Lawrence). 



COSTA RICAN PREMNOPLEX. 



Adults {sexes alike). — Pileiim olive or deep grayish olive, the 

 feathers margined with dusky, those of the forehead with rather 

 broad mesial streaks of buff; rest of upper parts mummy brown 

 passing into Vandyke brown on rump and upper tail-coverts, the 

 scapulars and interscapulars indistmctly margined with dusky, the 

 latter (especially on upper back) sometimes with narrow and mostly 

 indistinct shaft-streaks of buff; tail darker or duller Vandyke brown 

 than rump, sometimes nearly seal brown; loral, superciliary, and 

 supra-auricular regions buff, the latter streaked with dusky; auricu- 

 lar and suborbital regions dusky or dark sooty brown, streaked (the 

 latter spotted or flecked) with buffy; malar region, chin, and throat 

 deep buff, the feathers of throat usually indistinctly margined with 

 blackish; rest of under parts olive, conspicuously variegated with 

 large spots and streaks of light buff and black or dusky margins to 

 the feathers, the former largest on chest, where occupying all of each 

 feather except a broad black margin, narrower, more streak-like on 

 sides, more indistmct on abdomen and flanks, indistinct or obsolete 

 on under tail-coverts; maxilla black, mandible dull whitish or j^ellow- 

 ish (in dried skins) with a sharply defined stripe of blackish along 

 tomia; iris brown; legs and feet dusky or horn color (in dried 

 skins). 



Young. — Similar to adults in coloration but under parts of body 

 with margins to feathers rather broader and more blackish and 

 mesial spots and streaks rather deeper buff. 



a Margarornis brunnescens Sclater, Proc. Zool. Soc. Lond., June 16, 1856, 27, pi. 

 116 (Bogota, Colombia; coll. P. L. Sclater); Cat. Birds Brit. Mus., xv, 1890, 123, 

 part. — Premnoplex brunnescens brunnescens Bangs, Proc. Biol. Soc. Wash., xxi, July 

 27, 1908, 159 (centr. and w. Colombia to Peru; crit.). 



b Premnoplex coloratus Bangs, Proc. New Engl. Zool. Club, iii. Mar. 31, 1902, 84 

 (San Miguel, Santa Marta, Colombia, 7,500 ft.; coll. E. A. and O. Bangs). — Premno- 

 plex brunnescens coloratus Bangs, Proc. Biol. Soc. Wash., xxi, July 27, 1908, 159 

 (Sierra Nevada de Santa Marta; crit.). 



