XENOPS. 165 



(M'Zeannan ^ i2)._South 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. geniharhis 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. geniharUs 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. 17^ Scl. & Salv. P.Z. S. 1879, p. 522^; Scl. Cat. Birds 



Brit. Mus. XV. p. lll^ 

 Xenops heterurus, Cab. & Heine, Mus. Hein. ii. p. 33 *j Salv. Ibis, 1869, p. 319'; P. Z. S. 1870, 



p. 192 \ 



Supra cinnamomeo-brunneus, uropygio clariore, capite summo brunneo cervino striate, cervioe postica et dorso 

 antico quoque plus minusve striatis, superciliis et stria utrinque rictali albis, teotricibus auricularibua 

 nigro et albo variegatis, gula alba, corpore subtus reliquo fuseo albido striate ; alis nigris extus cinnamomeis, 

 remigibus omnibus (tribus externis exceptis) medialiter fascia cinnamomea notatis, apicibus quoque 

 cinnamomeis ; Cauda cinnamomea, reofcricibus duabus intermediis utrinque in pogonio interne nigris : 

 rostro oornee, mandibula infra pallida ; pedibus cerylinis. Long, tota 4-75, alse 2-6, caudae 1-9, rostri ,•. 

 rictu 0-6, tarsi 0-55. (Descr. maris ex Chiriqui. Mus. nostr.) 



Hab. Costa Eica {Carmiol s) ; Panama, Volcan de Chiriqui {Arce ^). — South America 

 generally ^ from Colombia ^ 4 to South Brazil ^. 



Xenops rutilus may readily be distinguished from X. genibarUs 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 



