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 maZe.— 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. ^hength (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 Villas; Jimenez). 



Chsetura cinereiventris guianensis (not of Ilartert) Ridgway, Proc. U. S. Nat. 



Mus., xvi, 1893, 43, part (Rio Escondido, Nicaragua). — Richmond, Proc. 



U. S. Nat. Mus., xvi, 1893, 516 (Rio Escondido; Rio Frio, Costa Rica). 

 C[hseturd\ cinereiventris guianensis Ridgway, Proc. U. S. Nat. Mus., xvi, 1893, 



44, part (Rio Escondido, Nicaragua). 

 Ch[setura] cinereiventris guianensis Hartert, Das Tierreich, Podarg., Caprim., 



Macropt., 1897, 76. part. 

 [Chsetura] guianensis Sharpe, Hand-list, ii, 1900, 92, part (Costa Rica; Nicaragua). 

 Chsetura fumosa (not of Salvin) Salvin and Godman, Biol. Centr.-Am., Aves, ii, 



1894, 377, part (Rio Escondido; Rio Frio). 

 Chsetura cinereiventris phseopygos Hellmayr, Bull. Brit. Orn. Club, xvi, no. 



cxxiv. May 8, 1906, 83 (Carrillo, e. Costa Rica; coll. Tring Mus.); Verb. Om. 



Gesellsch. Bayern, viii, 1908, 156 (synonymy; descr.). — Bangs, Proc. New 



Engl. Zool. Club, iv, 1908, 25, 26 (Carrillo and Juan Vinas, Costa Rica; crit.). — 



Carriker, Ann. Carnegie Mus., vi, 1910, 508 (Caribbean lowlands of Costa 



Rica). 



CH^TURA 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.— L&\\gi\\ (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).'' 



a Six specimene. & Three specimens. c Three specimens from St. Vincent. 



