Vinaral 
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82 TROGLODYTIDA. 
found within the limits of Central America and Mexico, our list containing eleven of 
the whole number; and of these only three pass beyond our borders into the southern 
continent, viz. the widely ranging 7. rufalbus, T. leucotis and T. nigricapillus, two 
southern species which penetrate as far north as the State of Panama. ‘The remaining 
eight species are all locally distributed, Costa Rica and Panama claiming the larger 
part. 
A. Caput fere dorso concolor. 
a. Subtus immaculate. 
a’. Crissum nigro transfasciatum. 
1. Thryophilus rufalbus. 
Thriothorus rufalbus, Lafr. Rev. Zool. 1845, p. 337°. 
Thryothorus rufalbus, Scl. P. Z. 8. 1856, p. 140°; Scl. & Salv. Ibis, 1859, p. 8°; P. Z. 8S. 1864, 
p. 345'; Cab. J. f. Orn. 1860, p. 408°; Lawr. Ann. Lyc. N. Y. viii. pp. 5°, 175"; v. Frantzius, 
J. f. Orn. 1869, p. 291°; Salv. P. Z.S. 1870, p. 181°. 
Thryophilus rufalbus, var. rufalbus et var. poliopleura, Baird, Rev. Am. B. p. 128”. 
Thryophilus rufalbus, Lawr. Ann. Lye. N. Y. ix. p. 92"; Salv. & Godm. Ibis, 1880, p. 116”. 
Thryothorus longirostris, Lawr. Ann. Lyc. N. Y. vii. p. 820" (nec Vieillot). 
Troglodytes cumanensis, Licht. Nomencl. p. 34, fide Cab. J. f. Orn. 1860, p. 408”. 
Supra lete castanea pileo paulo obscuriore, alis extus et cauda nigro frequenter transfasciatis ; superciliis 
distinctis et capitis lateribus albis, his nigro striolatis; subtus albus hypochondriis fuscescentibus, crisso 
nigro late transfasciato ; rostro corneo mandibula albicante; pedibus flavescentibus. Long. tota 6:2, 
alee 2°8, caudee 2:3, rostri a rictu 1°0, tarsi 1-0. (Descr. maris ex Panama. Mus. nostr.) 
Obs. Specimina ex Guatemala hypochondriis grisescentioribus differunt, unde var. poliopleura, Baird "*. 
Hab. Guaremaua, Volcan de Fuego, Duefias, Savana Grande, San Diego, Escuintla, 
Retalhuleu, Coban (0. S. & F. D. G.); Cogra Rica®, San José (v. Frantzius*), 
Volcan de Irazu (Rogers), San Mateo (Cooper), Bebedero (Arcé); Panama, David 
(Bridges*, Hicks’), Boqueti, Chitra, Castillo, Calovevora (Arcé®), line of railway 
(M‘Leannan!, O. S.4)!.—Cotomsta, Obispe (0. S.) 14; VENEZUELA; TRINIDAD. 
Thryophilus rufalbus is subject to a slight amount of variation at various points of 
its wide range, which extends from Guatemala in the north to the South-American 
continent, where it is found in the countries lying along the northern shore. ‘These 
variations have been fully described by Dr. Cabanis® and by Prof. Baird 1°, and consist 
chiefly in the smaller size and more chestnut flanks of the southern as compared with 
the Panama bird, and in the greyish cast of the white of the under plumage of Guate- 
malan examples—differences observable, it is true, but so slight that we hesitate to pro- 
nounce the possessors of them to be distinct races. ‘Though Lafresnaye stated that the bird 
upon which he bestowed the name 7. rufalbus came from Mexico 1, a more southern 
origin for his type has latterly been attributed to it ° \—a supposition which is probably 
correct, seeing that the bird has not been detected in Mexico by recent travellers. 
