88 TROGLODYTIDZ. 
9, Thryophilus semibadius. (Tab. VI. fig. 3.) 
Thryothorus semibadius, Salv. P. Z.S. 1870, p. 181°. 
Supra intense castaneus, fronte et capitis lateribus albis, plumis singulis nigro marginatis ; alis et cauda nigris, 
extus badio transfasciatis, tectricibus alarum minoribus albo transvittatis ; subtus albus, a pectore usque 
ad caudam nigro transfasciatus, gula pure alba, hypochondriis postice castanco lavatis; rostro corneo, 
mandibula pallidiore ; pedibus nigricantibus. Long. tota 5:3, alee 2°6, caudee 2°0, rostri a rictu 0:9, tarsi 
0-9. (Descr. maris ex Bugaba, in Statu Panamensi. Mus. nostr.) 
Hab. Panama, Bugaba, Bibala (Arcé '). 
This Wren is only known to us from specimens sent to us from the neighbourhood 
of Chiriqui by our collector Arcé. The species is a very distinct one, allied to 7. cas- 
taneus and T. nigricapillus on the one hand, and 7. pleurostictus on the other—differing 
from the former in having the top of the head of the same rich chestnut as the back, 
and from the latter in the colour of the back and in the numerous cross bands of the 
under surface. 
B. Caput nigrum, dorsum castaneum. 
10. Thryophilus castaneus. 
Thryothorus castaneus, Lawr. Ann. Lyc. N. Y. vii. p. 821°; Scl. & Salv. P.Z.S. 1864, p. 346°; 
Salv. P. Z.S. 1867, p. 184°. 
Thryophilus castaneus, Baird, Rev. Am. B. i. p. 183°; Lawr. Ann. Lye. N. Y. ix. p. 93°. 
Thryothorus nigricapillus ?, Lawr. Ann. Lyc. N.Y. vii. p. 293° (nec Sclater). 
| Supra late castaneus, pileo toto cum capitis lateribus nigerrimis, regione parotica sericeo-alba ; alis et cauda 
nigris castaneo frequenter transfasciatis; subtus gula et pectore antico albis, stria mystacali nigra, 
abdomine toto castaneo, hypochrondriis et crisso nigro transfasciatis ; rostro nigricanti-corneo, mandibula 
pallidiore; pedibus fuscis. Long. tota 5:4, ale 2°8, caude 2:3, rostri a rictu ll, tarsi 1-1. (Descr. 
maris ex Lion Hill, Panama. Mus. nostr.) 
Obs. In speciminibus ex Costa Rica fascize abdominis nigre carent, gula quoque nec pectus alba est. Forsan 
species alia. 
Hab. Costa Rica, Pacuar, Angostura (f. Carmiol®), Tucurriqui (Arcé); Panama, Santiago 
de Veraguas (Arcé *), Lion Hill (A/‘Leannan 1? *°®), 
This is a beautiful species allied to 7. nigricapillus, but differing from it in having 
the underparts deep chestnut instead of barred with black and white. Mr. Lawrence, 
on first receiving specimens from M‘Leannan, thought they might belong to T. nigri- 
capillus®; but he soon afterwards described the bird under its present name!. All 
the Panama birds we have seen have the underparts more or less barred with obsolete 
black transverse bands. Costa-Rica specimens, on the other hand, so far as we know, 
have the belly of a rich unbarred chestnut colour, and the white of the throat much 
more restricted in extent. We thus have indications of the existence of two races of 
this bird in Central America—the Panama bird, if our specimens indicate the normal 
coloration, being somewhat intermediate in colour as well as in locality between the 
one found in Costa Rica and that of Western Colombia and Ecuador which bears the 
name 7. nigricapillus. 
