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30 BANGS — COSTA RICAN BIRDS 
Thryorchilus ridgwayi Bangs. 
On his last trip to Ivazti in December, 1906, and January, 1907, 
Mr. Underwood made special efforts to get specimens of Ridgway’s 
wren, and succeeded in taking four. These are all in very fresh 
plumage, with the feathers long and unworn, and the colors of the 
back are rather brighter than in the type. They are darker and 
browner, however, than in 7. brown of the Volean de Chiriqui. 
The under parts, especially the throat and belly, are whiter, less 
grayish, than in T. brown. 
The larger size of T. redgwayi is borne out by the present series 
which affords the following measurements (in millimeters). 
Sex Exposed 
No. and age Wing Tail Tarsus culmen 
19,147 Oo ad. ‘5 5) 29.0 23 .0 —— 
19,146 Q ad. 48 .0 28 .0 21.5 1125 
19,148 2 exel. 49.0 28.5 22.0 MPAs) 
19,149 Q ad. 49.0 29.0 Pp) —- 
Myioborus aurantiacus (Baird). 
Recently | compared, for the first time a large series of Myzo- 
borus aurantiacus from Costa Rica with the five examples taken in 
1901 by Brown on the Volcan de Chiriqui, and was quite surprised 
to find that the latter represent a form easily distinguished from 
true M. awrantiacus by the paler, yellower, less orange, color of the 
under parts. It therefore seems necessary to restrict true M. 
aurantiacus to the highlands of Costa Rica, and to give the Chiriqui 
bird a name, and I propose for it 
Myioborus aurantiacus acceptus subsp. nov. 
Type, from Boquete (4000 feet altitude), Volean de Chiriqui, Panama, 
Q adult, no. 9564, coll. of E. A. and O. Bangs, collected Jan. 17, 1901, by 
W. W. Brown, Jr. 
Characters.— Similar to true M. aurantiacus (Baird) of the highlands 
of Costa Rica, and of the same size, but the yellow of the under parts 
