1915.] Chapman, New South American Birds. 387 
that this character, while apparently reasonably constant in some forms is 
not so in others. ‘Thus of nineteen specimens of C. r. gularis only two show 
traces of bars on the outer rectrices, but on the other hand ten out of eigh- 
teen specimens of C. r. rubripileus have these feathers barred. Of twelve 
specimens of rubiginosus, trinitatts and tobagensts not one is without bars. 
Six specimens of merzdensis and four of buenaviste are essentially unbarred, 
but of nine specimens of allent seven are with bars. This form therefore 
seems to be, in respect to this marking, intermediate between the barred 
rubiginosus type and the unbarred Central American forms. 
Measurements. 
Sex Wing Tail Culmen 
Merida, Venezuela rot 121 68.5 24 
sf i of 1 74 24.5 
Buena Vista, Col. of 125 77 28 
id . Bs of 126 ag 26 
Merida, Venezuela Q 1238 75 23 
xs ” Q 120 70 23 
Buena Vista, Col. Q 124 74 28 
” ¥ Q 123 72 28 
Atlapetes gutturalis brunnescens subsp. nov. 
Char. subsp.— Similar to A. g. gutturalis but back, flanks and under tail-coverts 
browner, the former between olive-brown and fuscous rather than deep mouse-gray; 
the flanks and under tail-coverts buffy brown rather than mouse-gray ; yellow of throat 
averaging paler and more restricted. 
Type.— No. 77885, Am. Mus. Nat. Hist., o7, Sept. 13, 1901, Boquete, Chiriqui, 
J. H. Batty. 
Remarks.— Comparison of 35 specimens of this form (Boquete, Chiriqui, 
26; San Jose, Costa Rica, 1; Irazu, Costa Rica, 1; San Rafael and Mata- 
galpa, Nicaragua, 6; Guatemala, 1) with about an equal number from 
Colombia, including topotypical ‘ Bogota’ specimens show that the char- 
acters above given are constant and diagnostic. Specimens in fresh, post- 
nuptial plumage are browner than those in worn breeding dress, but at any 
season Central American birds may be readily distinguished from Colombian 
ones. 
There is a possibility that Buarremon chrysopogon Scl. ex Bp. MS., said 
to have come from “ California’? may be applicable to the Central American 
form but in the absence of means of determining whence it came, there 
appears to be no way of deciding whether or not it is synonymous with the 
