CHATURA. 317 
Hab. Mexico, N. Yucatan (G. F. Gaumer??), Merida (Schott, in U. S. Nat. Mus. +), 
Silam ®, Temax °, Cozumel I.° (G. F. Gawmer), Tunkas and Ticul (W. Stone ®); 
Nicaragua, Rio Escondido (C. W. Richmond) ; Costa Rica (Van Patten*+); Panama, 
Chiriqui (Arcé >). 
Chetura gaumeri seems to be a small resident form of C. vauai, 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. gaumert 
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. peregrinator, 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 Cypselide 
in the British Museum ’. 
6. Chetura fumosa. 
Chetura fumosa, Salv. P. Z. S. 1870, p. 2041; Wyatt, Ibis, 1871, p. 3757; Hartert, Cat. Birds 
Brit. Mus. xvi. p. 483°. 
Chetura spinicauda, Layard (nec Temm.), Ibis, 1878, p. 389%. 
Chetura cinereiventris guianensis, Ridgw. Pr. U.S. Nat. Mus. xvi. p. 43 (partim)*; Richmond,. 
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, alee 4°4, 
caude 1°5. (Descr. exempl. typ. ex Bugaba, Panama. Mus. nostr.) 
Hab. Nicaraava, Rio Escondido (C. W. Richmond *); Costa Rica, Rio Frio (C. W. B.°); 
PanaMa, Bugaba1, Volcan de Chiriqui (Arcé).—CotomBia?; AMmAzoNs VALLEY, 
Santarem °, Para‘. 
Chetura 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. U.S. Nat. Mus. xvi. p. 516. Mr. Richmond’s birds have been already mentioned, anted p. 376, as 
C. vauai, the name sent us by Mr. Ridgway, who first examined them. In the paper cited Mr. Richmond puts. 
this right. 
BIOL. CENTR.-AMER., Aves, Vol. II., October 1894. 48 
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