710 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



379, part (Brit. Columbia; w. United States; Rio Seco, near Cordova; Valley 

 of Mexico; Puebla; Laguna del Rosario, Tlaxcala; Guichicovi, Oaxaca; 

 Raxche, Coban, Duenas, Alotenango, etc., Guatemala?; Hondiuras?). — 

 Brooks, Auk, xx, 1903, 282 (Caribou distr., Brit. Columbia). — Bendire, 

 Life Hist. N. Am. Birds, ii, 1895, 175.— Dawson, Wilson Bull., no. 10, 1896, 

 4 (Okanogan Co., e. Washington; habits). 

 C[ypseloides] niger Ridgway, Man. N. Am. Birds, 1887, 302, part. 



NEPHCECETES NIGER COSTARICENSIS (Ridgway). 



COSTA RICAN BLACK SWIFT. 



Similar to N. n. horealis, but decidedly darker, the adult female with 

 feathers of abdomen and flanks more broadly tipped with wdiite, and 

 averaging slightly smaller; adult male similar to that of N. n. jamai- 

 censis, but wing averaging longer and tail decidedly shorter, and gen- 

 eral color of head and neck decidedly more grayish. 



Adult maZe.— Length (sldns), 135-152 (146); wing, 154-165..r, 

 (159); tail, 57.5-63.5 (58.6); exposed culmen, 6.5-7 (6.6); tarsus, 

 12-13 (12.4); middle toe, 9-10 (9.5).« 



Adult female.— Length (skins), 134-145 (139); wing, 152.5-162 

 (157.1); tail, 50.5-53.5 (51.9); exposed culmen, 6; tarsus, 12-12.5 

 (12.3); middle toe, 9.5.^ 



Highlands of Costa Kica (San Jose; San Pedro; Buenos Aires). 



Cypseloides niger (not Eirundo nigra Gmelin) Zeledon, Anal. Mus. Nac. Costa 

 Rica, i, 1887, 120 (San Jose, Costa Rica).— Cherrie, Auk, vii, 1890, 333 (San 

 Jose); ix, 1892, 324 (San Jose). — Salvin and Godman, Biol. Centr.-Am., 

 Aves, ii, 1894, 379, part (Costa Rica). 



C[ypseloides] niger Ridgway, Man. N. Am. Birds, 1887, 302, part (Costa Rica). 



[Cypseloides tiigcr] Subsp. a. Cypseloides horealis Hartert, Cat. Birds Brit. Mus., 

 xvi, 1892, 495, part. 



[Cypseloides'] horealis Sharpe, Hand-list, ii, 1900, 93, part (Costa Rica). 



Cypseloides niger horealis Carriker, Ann. Carnegie Mus., vi, 1910, 509 (highlands 

 of Costa Rica). 



Cypseloides niger costaricensis Ridgway, Proc. Biol. Soc. Wash., xxiii, Apr. 10, 

 1910, 53 (San Jose, Costa Rica; coll. U. S. Nat. Mus.). 



Genus CYPSELOIDES Streubel. 



Cypseloides Streubel, Isis, 1848, 366. (Type, Hemiprocne fwnigata Streubel.) 

 Aerornisc Bertoni, Aves Nuevas del Paraguay, 1901, 66. (Type, A. niveifrons 

 Bertom= Cypselus senex Temminck.) 



Rather small Chseturine Swifts (wing about 119-123 mm.) resem- 

 bling and closely related to NepTicecetes but differing in truncate or 

 very slightly emarginate or double-rounded tail, with rigid shafts 

 to rectrices. 



Nostrils rather broadly oval, nearly parallel, for the greater part 

 posterior to the latero-frontal antise; distance from tip of longest 

 secondary to that of longest prunary decidedly less than two-thu'ds 

 the total length of wing; tenth (outermost) primary longest in 

 C. cherriei, decidedly shorter than ninth in C. hrunneitorgues (in the 



« Five specimens. & Four specimens. c 'Arjp, Siii; opvic, bird. (Bertoni.) 



