GTMNOPITHYS. 221 



B. Terrestres : tarsi plerumque elongati. 



c. Begio ocularis plus minusve nuda. 



c'. Nares semioperculatoB. 



GYMNOPITHYS. 



Gymnopithys, Bonaparte, Ann. Sc. Nat. (iv.) i. p. 132 j Scl. Cat. Birds Brit. Mus. xv. p. 296. 



Mr. Sclater places Pithys leucaspis and its allies with P. albifrons^ the type of the 

 genus Pithys ; but it belongs rather to Oymnopithys, of which G. rufigula is the type. 



P. alhifrons is a very peculiar species with no near allies. It has oval open nostrils 

 which are situated high up near the culmen ; the orbital space is feathered and the 

 formation of the crest is quite sui generis, G. fulvigula has a naked orbital space and 

 operculated nostrils, in both of which characters it is followed by G. leucaspis and its 

 allies. 



The range of Gymnopithys extends from Guiana over the Amazons Valley to 

 Colombia, and thence northwards to Nicaragua ; two closely allied species occurring 

 within our limits. 



1. Gymnopithys bicolor. 



Pithys leucaspis, Lawr. Ann. Lye. N. Y. vii. p. 326 (nee Scl.) ^. 



Pithys bicolor, Itamr. Axin. Lye. N. Y. viii. p. 6"; Sel. & Salv. P.Z. S. 1864, p. 357'; Salv. 

 P. Z. S. 1867, p. 145" ; Scl. Cat. Birds Brit. Mus. xv. p. 296 (partim) \ 



Supra rufo-brunnea, fronte et capitis lateribus nigricanti-cinereis, tectricibus auricularibus nigris, regione 

 postoculari nuda : subtus alba, cervicis lateribus, hypochondriis et tectricibus subcaudalibus brunneis ; 

 subalaribus fuliginosis, remigibus interne umbrino marginatis: rostro nigricante, mandibula pallida, 

 pedibus corylinis; Long, tota 5'0, alae 3-0, caudae 1*9, rostri a rictu 0-75, tarsi 1-05. (Descr. maris ex 

 Panama. Mus. nostr.) 



$ mari simUis. 



Hab. Panama, Santa Fe {Arce ^), Lion Hill Station [M'Leannan ^ ^ ^), Paraiso Station 

 (Hughes), Chepo {Arce). 



This species was at first referred to G. leucaspis by Mr. Lawrence i, who soon, 

 however, appreciated its differences from that bird and described it under its present 

 name ^. From G. leucaspis it differs in being duller on the upper surface and in 

 having the forehead and sides of the head cinereous instead of reddish ; moreover the 

 male of G. bicolor has no concealed dorsal spot as in G. leucaspis. Both birds have a 

 naked space behind the eye, which in the case of G. leucaspis is said to -be light blue, 

 the legs being of the same colour and the iris red. Concerning G. bicolor we have no 

 information on these points. 



The range of this species is strictly confined to the southern portion of the State of 



