522 BULLETIN 5 0, UNITED STATES NATIONAL MUSEUM 



Juvenal (sexes alike in all probability, but no female seen). — 

 Practically identical with that of Geranospiza nigra nigra, but slightly 

 paler on the dark areas, slightly brownish deep neutral gray instead 

 of chaetura black. 



Natal down. — Not known. 



Adult male.—Wmg 285-293; tail 233-236; culmen from cere 20.5-21 ; 

 tarsus 83-86; middle toe without claw 33-33 mm. (2 specimens from 

 Panama) . 



Adult female. — Wing 298; tail 235; culmen from cere 22; tarsus 89; 

 middle toe without claw 37 mm. (1 specimen from Panama). 



Range. — Resident in heavy forest in eastern Darien, Panama (Rio 

 Tuyra, Permie), and in western Ecuador, west of the Andes (Baba- 

 hoyo; Puna Island; Vinces; Balzar Mountains; Peripa; Daule; Lech- 

 ugal) ; not yet found in Colombia. 



Type locality. — Balzar Mountains, Guayas Province, Ecuador. 



Geranospiza gracilis (not Falco giacilis Temminck, 1821) Gray, List Spec. Brit. 



Mas., pt. 1, ed. 2, 1848, 68, part (Pund, Island, w. Ecuador). 

 Geranospiza caerulescens (not Sparvins coerulescens Vieillot, 1817) Sclater, 



Proc. Zool. Soc. London, 1860, 288 (Babahoyo, w. Ecuador; fresh colors of 



unfeathered parts). — Taczanowski, Orn. Perou, i, 1884, 168; Proc. Zool. 



Soc. London, 1877, 329 (Lechugal, Ecuador). — Berlepsch, Proc. Zool. 



Soc. London, 1885, 19 (Babahoyo and Puna Island, w. Ecuador). 

 Geranospiza coerulescens (not Sparvius coerulescens Vieillot, 1817) Lawrence, 



Ann. Lye. Nat. Hist., New York, vii, 1861, 289, in part (Panama). 

 Geranospizias caerulescens Sharpe, Cat. Birds Brit. Mus., i 1874, 81, part; Hand- 

 List, i, 1899, 247, part (Panama). — Salvadori and Festa, Boll. Mus. Zool. 



Torino, xv, 1900, 29 (Vinces and Peripa, Ecuador). — Chubb, Ibis, 1919, 



280 (Peru; Marropon). 

 Geranospiza caerulescens var. caerulescens PlIugway, Proc. Boston Soc. Nat. Hist., 



xvi, 1873, 84, part (Panama; diagn.). 

 Geranospiza caerulescens a. var. caerulescens Ridgway, Proc. Boston Soc. Nat. 



Hist., xvi, 1873, 84, part (Panama; syn.). 

 Geranospizias niger Gurney, List Diurn. Birds Prey, 1884, 26, part; Cat. Birds 



Prey, 1894, 19, part. — Sharpe, Hand-list, i, 1899, 247, part (Panama). 

 Geranospizias caerulescens niger Swann, Synopt. List Accip., pt. 1, 1919, 17, 



part (Panama); Synop Accip., pt. 1, 1921, 28, part; pt. 4, 1922 (errata and 



add.). 

 Geranospiza niger halzarensis Sclater, Bull. Brit. Orn. Club, xxxviii, No. 231, 



1918, 45 (Balzar Mountains; Guyas, w. Ecuador; type in coll. Brit. Mus.). — 



Swann, Monogr. Birds Prey, i, 1925, 157 (monogr.). 

 Geranospiza nigra halzarensis Peters, Check-list Birds of World, i, 1931, 268. — • 



Griscom, Bull. Mus. Comp. Zool., Ixxviii, 1935, 301 (extreme eastern Dari- 

 en). — Wetmore, Proc. U. S. Nat. Mus., Ixxxvii, 1939, 186, in text. 

 Geranospizias caerulescens halzarensis Swann, Synopt. List Accip., pt. 3, 1920, 



115; Synop. Accip., pt. 1, 1921, 27. — Chapman, Bull. Amer. Mus. Nat. Hist., 



Iv, 1926, 223 (Daule, Pund Island, Ecuador, and Rio Tuyra, Panama; 



spec). — Griscom, Bull. Mus. Comp. Zool., Ixxii, 1932, 316 (Perm6, Panama). 

 Geranospiza caerulescens halzarensis Gyldenstolpe, Kungl. Svenska Vetenskap- 



sak. Handlngr., xxii. No. 3, 1945, 28, in text (e. Panama to sw. Ecuador). 



