90 . TROGLODYTID ZA. 
we have employed slight characters which serve to group the species into what appear 
to be natural groups. 
About eighteen species are now known of the genus; of these, nine are found within 
our borders. Four out of eleven belong to the Pheugopedius section, three of which 
are peculiar to Central America and Mexico, viz. 7. maculipectus to Mexico and 
Guatemala, 7. atrogularis to Costa Rica, and 7. hyperythrus to the State of Panama— 
the fourth, 7. fasciativentris, ranging from Costa Rica to Colombia. Of the more typical 
Thryothori, T. felix is peculiar to Mexico and T. lawrencii to the Tres-Marias Islands ; 
T. beriandieri just enters our north-eastern border, and 7. albinucha is peculiar to 
Yucatan. Of the small-billed section Thryomanes, T. bairdi is found throughout 
Mexico, and ranges beyond our northern border into the adjoining frontier territories. 
No true Thryothorus is found in the South-American continent ; but three species are 
peculiar to the Lesser Antilles. 
A. PHEUGOPEDIUS. 
Uropygium immaculatum. 
a. Rostrum valde robustum, gula immaculata. 
1. Thryothorus fasciativentris. 
Thryothorus fasciato-ventris, Lafr. Rev. Zool. 1845, p. 837°; Scl. & Salv. P. Z. 8. 1864, p. 3467, 
1879, p. 493°; Lawr. Ann. Lye. N. Y. ix. p. 92°; Salv. P. Z. 8. 1870, p. 180’. 
Cyphorhinus fasciato-ventris, Lawr. Ann. Lyc. N. Y. vii. p. 320°. 
Pheugopedius fasciato-ventris, Baird, Rev. Am. B. i. p. 184". 
Cyphorhinus albigularis, Scl. P. Z. 8. 1855, p. 76, pl. 88°. 
Supra rufescenti-brunneus, alis extus obsolete nigro transfasciatis ; cauda nigra brunneo transvittata ; capitis 
lateribus nigris, superciliis posticis et gutture toto pure albis, pectore late nigro, abdomine crissoque nigris 
albo transfasciatis ; rostro nigricanti-plumbeo, tomiis pallidis; pedibus obscure nigricantibus. Long. tota 
5°6, ale 2°7, caude 2-4, rostri a rictu 1:0, tarsi 1-1. (Descr. maris ex Lion Hill, Panama. Mus. 
nostr.) 
Juv. subtus rufescentior, gula cinereo-albicante et abdominis fasciolis albis nullis, rostri mandibula flava. 
(Descr. exempl. ex Chiriqui. Mus. nostr.) 
Hab. Costa Rica, San Mateo (J. Cooper*); Panama, (Delattre*), Bugaba®, Bibalé 
(Arcé), Lion Hill (/‘Leannan ? 67).—Corompta! 37, 
Though skins of this Wren are occasionally sent in collections from Bogota, it is in 
the valleys stretching northwards from that city that the bird is found, no trace of it 
having as yet been met with in the upper waters of the affluents of the Orinoco and 
Amazon. In the Cauca valley Salmon found it at Remedios and Neche 8, whence it 
spreads northwards through the State of Panama to Costa Rica. A specimen from 
Colombia furnished Lafresnaye with the description of his 7. fasciatoventris1, the 
name Cyphorhinus albigularis having been given by Mr. Sclater to a Panama bird 
