482 crpsELiD^, 



11. Chaetura gaumeri. 



Chffitura gaumori, Lawr. Ann. N. Y. Ac. ii. p. 246 (1882), iii. p. 273 

 (1883), iv. p. 271 (1884) ; lieichen. ^ Schalow, J. f. O. 1884, 

 p. 381 ; Ridffio. Pr. U.S. Nat. Mus. Vi. p. 415 (Costa Eica) (1884) ; 

 id. Man. N. Amer. B. p. 303 (1887) ; Salvin, Ibis, 1889, p. 367 

 (Coziimel). 



CliEetura yucatanica, Laior. Ann. N. Y. Ac. iii. pp. 156, 157 (1884) *. 



Clifetura 'peregrinator, Laivr. Ann. N. Y. Ac. iii. p. 273 (1885) * 

 (Yucatan). 



Similar to C. vauxi, but smaller, and darker above and on the 

 abdomen. Total length about 4-2 inches, wing 4-2, tail 1-5. 



Hah. Southern Mexico and Yucatan to Costa Ilica. 



"Whereas C. pelagka and C. vauxi wander south in winter, 

 C. gaumeri seems to be a resident bird throughout the year. 



a,b. AA.sV. Temax, Y'ucatan, May {G. F. Sclater Coll. 



Gauyner). 

 c-s. Ad. sk. Cozumel I., Yucatan [G. F. Salvin-Godman Coll. 



Gaume)-). 

 t, u. Ad. sk. Cozumel I., Yucatan, April {G. Salvin-Godman Coll. 



F. Gaumer). 

 V. Ad. sk. Chiriqui {Arci). Salvin-Godman Coll. 



12. ChaBtnra cinereicauda.. 



PVencejillo, Azara, Apunt. ii. p. 513 (1802)t. 



? Hirundo oxyura, Vieill. Nouv. Diet. xiv. p. 536 (founded on the 



latter) (1817). 

 Cypselus pelasgius, Wiecl, Beitr. iii. p. 347 (1833). , 

 Acanthylis oxyura, Bp. Consp. i. p. 64 (1850) ; Burm. Si/st. Ueb. 



Th. Bras. ii. p. 366 (1856) ; Eiiler, J.f. 0. 1867, p. 222 (nest). 

 Acanthylis cinereicauda, Cass. Proc. Ac. Sc. Phil. v. p. 58, pi. 13. 



tig. 2 (1858). 

 Chatura poliura, Scl. Cat. Am. B. p. 283 (1862) ; {d. P. Z. S. 1863, 



p. 101, 1865, p. 611; id. J. f. O. 1867, p. 133; Pelz. Orn. Bras. 



p. 16 (1868). 

 Chajtura cinereicauda, Scl. P. Z. S. 1870, p. 329 ; Scl. ^ Salv. No- 



mend. Av. Neotroj). p. 95 (1873). 



Adult. Forehead, crown, nape, back, and wings black with steel- 

 blue gloss ; rectrices above blackish brown with metallic gloss ; 

 rump and upper tail-coverts pale dusky brown. Total length nearly 

 4"o inches, wing 4"6, tail 1'7. 



This species is distinguished from C. gaumeri by its longer tail 

 and wings, by its undorparts being uniform, the throat not at all 



* I had the opportunity of comparing the types of C.yticaianica and C.pere- 

 (jrmator, which were kindly sent me by Prof. Allen, and cannot detect any 

 differences between C. gaumeri and the supposed new species. 



t Until specimens have been procured in Paraguay it must remain doubtful 

 whether Azara's bird is identical with that inhabiting Brazil or not. 



