XENOPS. 165 
(M‘Leannan 7 !2),—Sourn America generally from Colombia to Guiana and Eastern 
Brazil ¢. 
Several names have been applied to this bird based upon supposed local differences. 
One of these, X. mexicanus®, long passed current for the South Mexican and Central 
American form, which was stated to differ from the typical South American bird by 
being larger, more olive-coloured beneath, and in its ochraceous-white throat. The 
accumulation of a larger series proves that only one species can be satisfactorily 
recognized. | 
In our country, X. genibarbis is strictly confined to the forests of the hot country, 
such as are found on the eastern side of the Cordillera of Southern Mexico and Guate- 
mala. Its northern range does not extend beyond the middle of the State of Vera 
Cruz; but southward of this, on the Atlantic side of the mountains, it is probably 
found wherever any large tract of virgin forest occurs. Its range in altitude extends 
from the sea-level to a height of about 1500 or 2000 feet. 
On the western or Pacific side of the main mountain-chain we have not yet met with 
X. genibarbis northward of Costa Rica, but in that country, as well as in the State of 
Panama, it occurs on both sides of the mountains. 
2. Xenops rutilus. 
Xenops rutilus, Licht. Verz. Doubl. p. 177; Scl. & Salv. P.Z. 8. 1879, p. 522°; Scl. Cat. Birds 
Brit. Mus. xv. p. 111°. 
Xenops heterurus, Cab. & Heine, Mus. Hein. ii. p. 834; Salv. Ibis, 1869, p. 319°; P. Z.S. 1870, 
p. 192°. 
Supra cinnamomeo-brunneus, uropygio clariore, capite summo brunneo cervino striato, cervice postica et dorso 
antico quoque plus minusve striatis, superciliis et stria utrinque rictali albis, tectricibus auricularibus 
nigro et albo variegatis, gula alba, corpore subtus reliquo fusco albido striato ; alis nigris extus cinnamomeis, 
remigibus omnibus (tribus externis exceptis) medialiter fascia cinnamomea notatis, apicibus quoque 
cinnamomeis; cauda cinnamomea, rectricibus duabus intermediis utrinque in pogonio interno nigris: 
rostro corneo, mandibula infra pallida; pedibus corylinis. Long. tota 4°75, ale 2°6, caudex 1-9, rostri a 
rictu 0-6, tarsi 0°55. (Descr. maris ex Chiriqui. Mus. nostr.) 
Hab. Costa Rica (Carmiol 5); Panama, Volcan de Chiriqui (Arcé °).—SoutH AMERICA 
generally ? from Colombia?+4 to South Brazil }. 
Xenops rutilus may readily be distinguished from X. genibarbis by the colouring of 
the head and under surface, both of which have on each feather a definite central 
stripe which occupies the shaft and the portion of the web adjoining on either side. 
In X. genibarbis both the head and under surface are nearly uniformly coloured. 
The range of the two species is nearly the same throughout the southern continent ; 
but in Central America X. rutilus does not, so far as we know, pass beyond Costa Rica, 
X. genibarbis reaching Southern Mexico. 
The name X. rutilus was bestowed by Lichtenstein upon a Brazilian bird which was 
