606 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



THRYORCHILUS BROWNI (Bangs). 

 BROWN'S WREN. 



Adults {sexes alike). — Above plain mumm}^ ])rown," slig-htly duller 

 on pileum, the rump approaching chestnut-brown; tail and secondaries 

 dusky, rather broadl}- l)arred with lig-ht brown (usually deeper Iirown 

 on tertials); primaries dusky, about six or seven of the outermost 

 irregular!}^ edged with white;* alulae also edged with white, and pri- 

 mary coverts narrowly tipped with white; a broad white superciliary 

 stripe, extending to sides of nape; a broad postocular stripe, confluent 

 with brown of hindneck; lores white, or grayish white, faintly mottled 

 with gray; lower half (approximately) of auricular region and malar 

 region grayish white, the feathers sometimes very faintly edged or 

 margined with brown or dusky; sides of neck grayish white, the 

 feathers edged with dusky brown, producing short and indistinct 

 streaks; chin, throat, chest, breast, and aljdomen dull white (the feathers 

 with concealed bases blackish slate), the sides of lower throat and chest 

 sometimes minutely flecked with brown; flanks and under tail-coverts 

 light tawny-olive or russet; maxilla black with paler tomia; mandible 

 pale basally, "dusky terminall}-'" legs and feet horn color. 



Young. — Similar to adults, but feathers of chest, breast, and upper 

 abdomen distinctly margined with sooty brown, producing a squamate 

 effect, those of the throat streaked or flecked with soot}^; white super- 

 ciliary stripe narrower, less purely white; white edgings to primaries 

 broader, more conspicuous. '^ 



Adult m«Zt^— Length (skins), 98-lOT (100.7); wing, 45-51.5 (48.8); 

 tail, 28-35.5 (31.1); exposed culmen, 13-14.5 (13.7); tarsus, 22.5-24.5 

 (23.5); middle toe, 14-15 (14.5).^ 



Adult female. — Length (skin), 100.5; wing, 48; tail, 31.5; exposed 

 culmen, 13.5; tarsus, 22.5; middle toe, 14./ 



Volcan de Chiriqui, Isthmus of Panama, at 10,000 to 10,500 feet 

 altitude. 



Troglodytes browni Bangs, Proc. New Engl. Zool. Clul), iii, Jan. 30, 1902, 53 



(Volcan de Chiriqui, Colombia, alt. 10,000 ft.; coll. E. A. and 0. Bangs.) 

 Thryorchilus browni Oberholser, Proc. U. S. Nat. Mus., xxvii, no. 1354, Jan. 23, 

 1904, 198 (crit.). 



'^'The color much duller (nearly sepia or bistre, more sooty on pileum) in worn 

 2:)luuiage. 



b This white edging to the primaries is a very striking feature in this singular species, 

 and a certain means of identification. 



c The relative extent of the light and dark areas on the mandible varies greatly. 



rf These broad white edgings are occasionally broken by dusky spots, throwing the 

 white into the form of very broad bands or transverse spots. 



^ Six specimens. 



/ One specimen. 



