710 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
3879, part (Brit. Columbia; w: United States; Rio Seco, near Cérdova; Valley 
of Mexico; Puebla; Laguna del Rosdrio, Tlaxcala; Guichicovi, Oaxaca; 
Raxché, Cob4n, Duefias, Alotenango, etc., Guatemala?; Honduras?).— 
Brooxss, Auk; xx, 1903, 282 (Caribou distr:, Brit. Columbia) —Bznpirz, 
Life Hist. N. Am. Birds, ii, 1895, 175.—Dawson, Wilson Bull., no. 10, 1896, 
4 (Okanogan Co., e. Washington; habits). 
Clypseloides] niger Ripeway, Man. N. Am. Birds, 1887, 302, part. 
NEPHECETES NIGER COSTARICENSIS (Ridgway). 
COSTA RICAN BLACK SWIFT. 
Similar to NV. n. borealis, but decidedly darker, the adult female with 
feathers of abdomen and flanks more broadly tipped. with white, and 
averaging slightly smaller; adult male similar to that of NV. n. jamai- 
censis, but wing averaging longer and tail decidedly shorter, and gen- 
eral color of head and neck decidedly more grayish. 
Adult male—tLength (skins), 135-152 (146); wing, 154-165.5 
(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 Rica (San José; San Pedro; Buenos Aires). 
Cypseloides niger (not Hirundo nigra Gmelin) ZELEDON, Anal. Mus. Nac. Costa 
Rica, i, 1887, 120 (San José, Costa Rica).—CuErriz, Auk, vii, 1890, 333 (San 
José); ix, 1892, 324 (San José).—Saztvin and Gopman, Biol. Centr.-Am., 
Aves, ii, 1894, 379, part (Costa Rica). 
C[ypseloides] niger Ripeway, Man. N. Am. Birds, 1887, 302, part (Costa Rica). 
[Cypseloides niger] Subsp. a. Cypseloides borealis Hartert, Cat. Birds Brit. Mus., 
xvi, 1892, 495, part. 
[Cypseloides] borealis Sarre, Hand-list, ii, 1900, 93, part (Costa Rica). 
Cypseloides niger borealis CARRIKER, Ann. Carnegie Mus., vi, 1910, 509 (highlands 
of Costa Rica). 
Cypseloides niger costaricensis Ripaway, Proc. Biol. Soc. Wash., xxiii, Apr. 19, 
1910, 53 (San José, Costa Rica; coll. U. 8. Nat. Mus.). 
Genus CYPSELOIDES Streubel. 
Cypseloides STREUBEL, Isis, 1848, 366. (Type, Hemiprocne fumigata Streubel.) 
Aerornis¢ Bertoni, Aves Nuevas del Paraguay, 1901, 66. (Type, A. niveifrons 
Bertoni=Cypselus senex Temminck.) 
Rather small Cheturine Swifts (wing about 119-123 mm.) resem- 
bling and closely related to Nephecetes 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 anti; distance from tip of longest 
secondary to that of longest primary decidedly less than two-thirds 
the total length of wing; tenth (outermost) primary longest in 
C. cherriet, decidedly shorter than ninth in C. brunneitorques (in the 
@ Five specimens. > Four specimens. ©’ Ato, air; Sovec, bird. (Bertoni.) 
