GEOTHLYPIS. 153 



BuMus omnino flaya, hypochondriis olivaceis ; rostri maxilla nigra, mandibula cornea ; pedibus carneis. 

 Long, tota 5-0, alae 2-4, caudse 2-1, rostri a rictu 0'62, tarsi 0-9. (Descr. maris ex Volcan de Chiriqui. 

 Mus. nostr.) 

 2 adhuc ignota. 



Eai. Panama, Volcan de Chiriqui {Arce^). 



This bird is a close ally of the Brazilian Geothlypis velata, and an interesting one on 

 that account, its relationship with that species being closer on the whole than with 

 G. cequinocUalis, its nearest neighbour in point of locality. An attempt to account for 

 this peculiar distribution has already been made ^ ; but as the question will have to be 

 discussed in a more general way in the introduction to this work, it would be superfluous 

 to refer to it here. 



Like G. velata this species has the feathers of the postocular region grey ; but it differs 

 from its ally in the much greater extent of the black on the forehead. G. cequinoctialis 

 has the postocular area olive-coloured, thus differing from both the above-named species. 



Since describing the type, which was then unique, other specimens have reached us, 

 all of them bearing the distinctive characters of G. chiriquensis. 



The type specimen is now figured. 



5. Geothlypis caninucha. (Tab. IX. fig. 2.) 



Geothlypis poliocephala, var. caninucha, Baird, Brew. & Ridgw. N. Am. B. i. p. 296'. 



Geothlypis poliocephala, Baird, E,ev. Am. B. i. p. 225, partim^; Lawr. Ann. Lye. N. Y. ix. p. 200'; 



Salv. Ibis, 1870, p. 114*. 

 Geothlypis eequinoctialis, Salv. & Scl. Ibis, 1860, p. 273° (nee Gmelin). 



Supra olivacea, alls et cauda concoloribus ; capite summo et regione poetooulari griseis ; fronte anguste, loris 

 et plnmis subocularibns nigris ; Bubtus flava, bypochondriis ochrascescentioribtiB ; rostro robusto incnrvo, 

 maxiUa fusca, mandibula flavida ; pedibus carneis. Long, tota 5-7, alse 2-4, caudse 2-6, rostri a rictu 0-6, 

 tarsi 0-93. (Descr. maris ex Costa Eica. Mus. nostr.) 



$ aut (J juv. mari similis, sed capite inornato dorso concolori. 



Hab. Mexico, Merida {Schott^)1; Beitish Honduras (Blancaneaux) ; Guatemala, 



Ketalhuleu, Patio Bolas, Duenas ^ San Geronimo {0. S. & F. D. G.) ; Costa Rica 



(/. Carmiol*). 



Specimens of this bird were first obtained at Duenas in Guatemala ; but they were 



referred to the South-American' (r. eequinoctialis', the differences between them notv 



being then recognized. Other examples were afterwards found in Guatemala in various 



localities ranging in altitude from 800 to 5000 feet above the sea-level ; but it is not a 



common bird anywhere in that country. Its chief place of resort is in low scrubby 



second-growth woods, and often near water, its habits much resembling those of 



Geothlypis trichas. 



Costa-Eica specimens agree accurately with Guatemalan ones; but, as already stated, 

 the Mexican bird is distinguished by its white eyelids. 



BIOL, cent.-amee., Aves, Vol. 1, Augvst 1881. 20 



