728 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
and upper tail-coverts clear slate-gray, the feathers (except in worn 
plumage) narrowly tipped with whitish, the outer webs of tail-coverts 
rather darker gray; chin and upper throat pale gray (the feathers 
dusky or dark sooty basally), gradually passing into deep mouse 
gray on auricular region and chest, this passing, through dark slate 
or blackish slate on under parts of body, into slate-black on under 
tail-coverts; bill black; iris dark brown; legs and feet dusky. 
Adult male—Length (skins), 100-104 (102); wing, 104-110.5 
(107.1); tail, 36-41 (39); exposed culmen, 4.5-5.5 (5); tarsus, 9.5- 
10.5 (9.9); middle toe, 7-7.5 (7.2). 
Adult female—Length (skins), 100-102 (101); wing, 104.5-107.5 
(105.7); tail, 37-41 (38.8); exposed culmen, 4.5-5 (4.8); tarsus, 
9.5-10.5 (10.2); middle toe, 7-7.5 (7.2).® 
Eastern Nicaragua (Rio Escondido) and Costa Rica (Rio Frio; 
Carrillo; Juan Vifias; Jiménez). 
Chetura cinereiventris guianensis (not of Hartert) Ripeway, Proc. U. S. Nat. 
Mus., xvi, 1893, 43, part (Rio Escondido, Nicaragua).—Ricumonp, Proc. 
U.S. Nat. Mus., xvi, 1893, 516 (Rio Escondido; Rio Frio, Costa Rica). 
Clhetura] cinereiventris guianensis Ripgway, Proc. U. 8. Nat. Mus., xvi, 1893, 
44, part (Rio Escondido, Nicaragua). 
Ch{ztura] cinereiventris guianensis Hartert, Das Tierreich, Podarg., Caprim., 
Macropt., 1897, 76, part. 
[Chetura] guianensis Suarpe, Hand-list, ii, 1900, 92, part (Costa Rica; Nicaragua). 
Chetura fumosa (not of Salvin) Satvin and Gopman, Biol. Centr.-Am., Aves, ii, 
1894, 377, part (Rio Escondido; Rio Frio). 
Chetura cinereiventris phzopygos Hrtumayr, Bull. Brit. Orn. Club, xvi, no. 
cxxiv, May 8, 1906, 83 (Carrillo, e. Costa Rica; coll. Tring Mus.); Verh. Orn. 
Gesellsch. Bayern, viii, 1908, 156 (synonymy; descr.).—Banes, Proc. New 
Engl. Zool. Club, iv, 1908, 25, 26 (Carrillo and Juan-Vifias, Costa Rica; crit.).— 
CaRRIKER, Ann. Carnegie Mus., vi, 1910, 508 (Caribbean lowlands of Costa 
Rica). 
CHATURA BRACHYURA (Jardine). 
SHORT-TAILED SWIFT. 
Adults (sexes alike) —Head, neck, upper back, scapulars, wings, 
and under parts plain black, more or less distinctly glossed with 
bluish or greenish (especially on wings), the chest and throat more 
sooty, the chin still paler (sooty grayish); rump, tail-coverts (upper 
and lower), and tail light brownish gray or drab-gray (the tail- 
coverts narrowly tipped with whitish in fresh plumage), the gray 
darker on upper rump, where shading into grayish black or sooty on 
lower back; shafts of rectrices black; bill black; iris dark brown; 
legs and feet dusky. 
Adult male—Length (skins), 96-102 (99); wing, 120-122.5 (121); 
tail, 29.5-31 (30.3); exposed culmen, 4.5-5 (4.8); tarsus, 10.5-11 
(10.7); middle toe, 7.5-8 (7.7).¢ 
«Six specimens. 0% Threespecimens. °¢ Three specimens from St. Vincent. 
