32 TEOGLODTTID^. 



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 T. rufalbus, T. Imcotis 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. Suhtus immaculati. 



a'. Crissum nigro transfasciatum. 



1. Thryophilus rufalbus. 



Thriothorus rufalbus, Lafr. Eev. Zool. 1845, p. 337 '. 



Thryothorus rufalbus, Scl. P. Z. S. 1856, p. 140^; Scl. & Salv. Ibis, 1859, p. 8^ P. Z. S. 1864, 



p. 345*; Cab. J.f. Orn. 1860, p.408'j Lawr. Ann. Lye. 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 \a,r. 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. Lye. N. Y. vii. p. 320 " (nee Vieillot) . 

 Troglodytes eumanensis, Lieht. Nomencl. p. 34, fide Cab. J. £. Orn. 1860, p. 408". 



Supra Isete castanea pileo paulo obscuriore, alis extus et cauda nigro frequenter transfaseiatis ; superciliis 

 distinctis et capitis lateribus albis, his nigro striolatis ; subtus albus bypochondriis fusoescentibus, crisso 

 nigro late transfasoiato ; rostro corneo mandibula albicante ; pedibus flavescentibus. Long, tota 6-2, 

 alse 2-8, caudse 2-3, rostri a rictu 1"0, tarsi 1-0. (Descr. maris ex Panama. Mus. nostr.) 



Ohs, Specimina ex Gruatemala bypochondriis grisescentioribus differunt, xtnAe jax. poliopleura, Baird '°. 



Hob. Guatemala, Volcan de Fuego, Duefias, Savana Grande, San Diego, Escuintla, 

 Retalhuleu, CoU^n {0. S. & F. D. G,) ; Costa Eica^, San Jose (v. Frantzius ®), 

 Volcan de Irazu (Sogers), San Mateo (Coojoer^^), Bebedero (Arce); Panama, David 

 (Bridges ^, Hicks '^), Boqueti, Chitra, Castillo, Calovevora (Arce ^), line of railway 

 (M'Leannan^^, 0. S.^f. — Colombia, Obispo (0. S.y^'^^; Vbm:zuela; Tkinidad. 



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 i^, 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 T. rufalbus came from Mexico i, a more southern 

 origin for his type has latterly been attributed to it^ io_a supposition which is probably 

 correct, seeing that the bird has not been detected in Mexico by recent travellers. 



