^°i89l'^'] PROCEEDINGS UF THE NATIONAL MUSEUM. 519 



borders the white siiperciluiry stripe; " the rest of the iii)per parts are 

 " almost exactly as iu si)eciiueiis from Costa Ivica." Costa Jlican and 

 Veraguaii specimens have '' tlie feathers of the throat distinctly edged 

 with dusky, producing streaks." 



The second siviii from tlie Costa Rica National Museum ditiers so 

 much from other examples that I append a description. More material 

 might prove it to be distinct. 



No. 2lM)!), 9, Collection Museo Niicional de Costa Rica, El Achiote, 

 Costa Rica, November 22, 1888, A. Alfaro. Above similar to other Costa 

 Rica examples of II. leneDphrys, but with the entire head uniform, dusky 

 black, almost imperceptibly tinged with olive. Frontal feathers white, 

 but more of a yellowish hue than in the narrow white superciliary 

 stripe. Lores and a stripe extending through the eye black. Sides of 

 the face and neck white, streaked wiih black; the feathers white, hav- 

 ing black edges. The back is cht\stnut-brown, brighter on rump and 

 u]»per tail (coverts, washed with olive on the upi)er back ; wing-coverts 

 same cohn- as the back ; quills dusky blackish, outer webs like the 

 back, barred with blackish, the bars or mottling extending across the 

 inner secondaries. The outer primary is edged with white on the outer 

 web. Tail dusky brownish black, barred irregularly with black. 

 Throat white, feathers with indistinct dusky edgings; foreneck and 

 breast ash-gray, lighter on the lower breast, and distinctly barred with 

 blackish. Sides, tlanks, belly, and crissum light rufous-chestnut; the 

 under tail coverts, however, barred with black. 



Since returning to Costa Rica I tind in the collection of the Museo 

 Nacional another specimen, with head unitbrm dusky black and the 

 lower breast ash-gray barred with blackish, also having the under-tail 

 coverts barred with blackish ; otherwise there is no dirterence from 

 other Costa Rica examples ; and being taken at the same time and in 

 the same i)lace with normal examples, I now conclude it is onlj' a pe- 

 culiar phase of plumage. 



Thryophilus rufalbus castanonotus. 



Five adult spe(!imens before me are typical of the sub-species, by com- 

 parison with the tyi)e. No. 2()<I7, Museo Nacional de Costa Rica, is a 

 young bird evidently not long from the nest and (litters from descrip- 

 tions of young only in having the under-tail coverts faintly barred with 

 blackish. 



Thryophilus costariceiisis. 



A comparison of three specimens from the Museo Nacional de Costa 

 Rica with six other exam[)les irom Costa Rica, and one irom Nicaragua 

 (Los Sabalos) in the U. S. National Museum, with five Panama speci- 

 mens of cantaneus, leaves no doubt as to there being well detlned races 

 if not species. The Costa Rica sj)ecimens are all a bright uniform chest- 

 nut below, while the Panama exami)lesare orange-rutous conspicuously 



