THRYOPHILUS. 85 
from the higher mountainous interior of the country. 1. zeledoni has a close resem- 
blance to the Panama race of 7. modestus in its pale colour; but the Panama bird is 
smaller, not larger, than 7. modestus. As regards the ranges in altitude of these species 
ascribed to them in Costa Rica!, no deduction of much value can be drawn; for in 
Guatemala we found 7. modestus at elevations varying as much as 5000 feet and at less 
than 1000 feet above the sea-level. It is therefore hardly likely to be restricted in Costa 
Rica to the highlands. On the whole, we think that the relationships of 7. modestus 
and the Panama race of it to 7. zeledoni require further investigation; and we only 
regret that our materials are not sufficient to enable us to attempt an explanation of 
them. 
5. Thryophilus leucotis, 
Thriothorus leucotis, Lafr. Rev. Zool. 1845, p. 8338+; Bp. Consp. i. p. 221°. 
Thryophilus leucotis, Scl. & Salv. Nomencl. Av. Neotr. p. 6°. 
Thryothorus galbraithi, Lawr. Ann. Lyc. N. Y. vii. p. 820°. 
Thryophilus galbraithi, Baird, Rev. Am. B. i. p. 181’. 
Thryothorus albipectus, Cab. in Schomb. Guiana, iii. p. 673°; Scl. & Salv. P. Z.S. 1864, p. 3457. 
Thryothorus, sp.?, Cassin, Pr. Ac. Phil. 1860, p. 193°. 
Supra rufescenti-brunneus, uropygio cinnamomeo tincto; alis anguste, cauda late nigro transfasciatis ; super- 
ciliis distinctis, gula et genis sericeo-albis; subtus pallide fusco-cinnamomeus, gulam versus albicantior ; 
rostro corneo, mandibula albicante ; pedibus obscure fuscis. Long. tota 50, alee 25, caudee 1-9, rostri 
a rictu 1-0, tarsi 1: 0. (Descr. maris ex Lion Hill, Panama. Mus. nostr.) 
© mari similis. 
Hab, Panama, Lion Hill (M/*Leannan*), Turbo, Isthmus of Darien (Schott’).— 
CoLomBIA!; VENEZUELA; GurANA®, 
This species has a very limited range in Central America, where it has not been 
detected beyond the limits of the State of Panama. Here it was discovered by 
M‘Leannan and Galbraith, Mr. Lawrence describing the bird under the name of the 
latter naturalist’. A careful examination of Central-American examples with others 
from the northern parts of the South-American continent has convinced us? that no 
definite points of distinction can be traced between them, and that all should bear the 
name 1’, /eucotis, bestowed upon a bird from Colombia or Mexico (the latter locality 
doubtless an error, but repeated by Bonaparte?) by the late Baron Lafresnaye}, of which 
T. albipectus is a synonym®, In Western Ecuador a distinct race appears to exist, 
which Mr. Lawrence has called 7’. superciliaris, basing his characters upon specimens 
from the island of Puna in the Gulf of Guayaquil. 
At first sight 7’. dewcotis has a general resemblance to 7. modestus, but may readily 
be distinguished by the distinct dark bars on the wings. 
