CHiETUEA. 37T 



Hah. Mexico, N. Yucatan {G. F. Gaumer^% Merida {Schott, in U. S. Nat. Mus. i), 

 SHamS, Temax9, Cozumell.5 {G. F. (rawmer), Tunkas and Ticul {W. Stme^);^ 

 Nicaragua, Rio Escondido (C. W. Richmond) ; Costa Rica ( Van Patten *); Panama^ 

 Chiriqui [Arce ^). 



ChcBtura gaumeri seems to be a small resident form of C. vanxi, chiefly restricted to 

 Eastern Central America from the promontory of Northern Yucatan and the islands 

 adjoining to Nicaragua and Costa Rica. In the former country it frequents the large 

 ' senotes ' or caves formed like wells in the limestone formation of that peculiar district, 

 and where Dr. Gaumer says the species is abundant. Mr. Richmond found C. gaumeri 

 to be common on the Rio Escondido towards the end of May, when he supposed it to 

 be breeding *, 



Dr. Gaumer sent us a number of specimens of this bird captured during his visit to 

 Cozumel Island. From these we learn that there is a certain amount of individual 

 variation in size, and much in the extent to which the projecting ends of the shafts of 

 the rectrices are worn. It thus becomes evident that neither C. yucatanica nor 

 C. peregrinMor, both described by Mr. Lawrence from Yucatan birds, can be recognized 

 as distinct. This view was fully confirmed when we had an opportunity of seeing the 

 types, which were submitted to Mr. Hartert when compiling his Catalogue of Cypselidse 

 in the British Museum ^. 



6. Chsetura fumosa. 



Chaturafumosa, Salv. P. Z. S. 1870, p. 204'; Wyatt, Ibis, 1871, p. 375^; Hartert, Cat. Birds 



Brit. Mus. xvi. p. 483 '. 

 Chcetura spinicauda, Layard (nee Temm.), Ibis, 1873, p. 389 *. 

 CJuBtura cinereiventris guianensis, Ridgw. Pr. U. S. Nat. Mus. xvi. p. 43 (partim)'; Riehmond, 



Pr. U. S. Nat. Mus. xvi. p. 516 \ 

 Nigra vix purpureo nitens; uropygio et tectricibus supracaudalibus proximis cineriis, rhachidibus nigris:. 

 subtus gutture sordide cinereo-albo, pectore et abdomine toto nigricantibus. Long, tota circa 4-6, al8e4-4, 

 caudae 1-5. (Descr. exempl. typ. ex Bugaba, Panama. Mus. nostr.) 



Hob. NiCABAGUA, Rio Escondido (C. W. Richmond «) ; Costa Rica, Rio Frio (C. W. R.^) ; 



Panama, Bugaba S Volcan de Chiriqui (^rc<?).— Colombia ^ ; Amazons Valley,. 



Santarem ^, Para *. 

 Chcetura spinicauda of Guiana and Trinidad is the most nearly allied species to 

 C. fumosa, but the latter bird has a wider gray band across the rump, this colour 

 extending to the proximal upper tail-coverts, the shafts of these feathers alone being 

 dark ; the lower surface, too, of the body is darker and more uniform, the chin and 

 throat being of a dingy ashy white. 



* Pr TJ S Fat. Mus. xvi. p. 516. Mr. Richmond's birds bave been already mentioned, anteA p. 376, as 

 G. vau^, the name sent us by Mr. Ridgway, who first examined them. In the paper cited Mr. Richmond put^ 

 this right. 



BIOL. CENTR.-AMER., Aves, Vol. II., OctobeT 1894. 40 



