136 BULLETIN 5 0, UNITED STATES NATIONAL MUSEUM 



Wien, 1910, 90 (Joazeiro, Paranagua, etc., ne. Brazil). — Snethlage, Journ. 



fiir Orn., 1928, 572 (eggs; size of clutch). — Stone, Proc. Acad. Nat. Sci. 



Philadelphia, Ixxx, 1928, 154 (Pard, Brazil). 

 Rosthramus leucopygus Sharpe, Cat. Birds Brit. Mus., i, 1874, 328, part (Demar- 



ara, Brit. Guiana; Bogotd, Colombia; Pebas, e. Peru; Venezuela), 459. — 



Hellmatr, Abh. B. Akad. Wiss., Kl. II, xxii, No. 3, 1905, 568 (crit. as to 



Spix's type). — Snethlage, Journ. fiir Orn., 1908, 538 (Arumathena, Tocan- 



tins, Brazil). 

 Falco hamatus Temminck Planches Col., i, 1823, te.xt to pi. 61 (not pi. 61 or pi. 



231 which are Helicolestes hamatus). — Maximilian, Beitr. Naturg. Bras., iii, 



1830, 182. 

 Rostrhamus hamatus Hartlaub, Index Azara's Apunt., 1847, 2. — Cabanis, in 



Schomburgk's Reis. Brit. Guiana, iii, 1848 (1849), 736 (Brit. Guiana).— 



Bonaparte, Consp. Gen. Av., i, 1850, 20, part. — Bxjrmeister, Syst. tibers. 



Th. Bras., iii, 1856, 46; Journ. fiir Orn., 1860, 242 (near Parand, Entre Rios, 



Argentina). — Le6taud, Ois. Trinidad, 1866, 31 (Trinidad). — Pelzeln, Orn. 



Bras., i, 1868, 6 (Sao Paulo, Goydz, Matto Grosso). — Reinhardt, Vidensk. 



Medd. Naturhist. Foren., 1870, 66 (Sao Paulo).— Doering, Period. Zool. 



Arg., i, 1874, 247. 

 Rostramus hamatus Doering, Periodico Zool., i, 1874, 247 (Rio Guayquirar6, 



near the Parand, Corrientes, Argentina). — Burmeister, Reise durch La 



Plata-Staaten, ii, 1881, 435 (Rio Parand). 

 Rosthramus hamatus Fontana, Gran Chaco, 1881, 192 (on the banks of the rivers 



of the Chaco). 

 Falco rostrhamus Maximilian, Beitr. Naturg. Bras., iii, 1830, 182. 

 Rostrhamus niger Lesson, Traits d'Orn., 1831, 66 (Brazil; coll. Paris Mus.). 

 Rostrihamus tenuirostris Bertoni, Aves Nuevas de Paraguay, 1901, 171 (Alta 



Parand; orig. descr.; see Arribalzaga, Apunt. Crit. Av. Parag. Bertoni, 1902, 



378). 

 Rostrhamus toeniurus Sclater and Salvin, Nom. Av. Neotr., 1873, 121. 

 Rostrhamus taeniurus Gurnet, Ibis, 1879, 340 (synonymy); List Diurn. Birds 



Prey, 1884, 85.— Sharpe, Handlist, i, 1899, 269 (Amazonia; may refer to 



Helicolestes hamatus or to the present bird). — De Haan, Ardea, ix, 1920, 11 



(Surinam; crit.). 

 Rostrhamus sociabilis taeniurus Ihering and Ihering, Aves Brazil, 1907, 96 



(Pard, Brazil). 

 Rostrhamus hamatus taeniurus Ihering and Ihering, Aves Brazil, 1907, 410 



(Amazonia, Brazil; crit.). 

 Hamirostrum taeniuruin Heine and Reichenow, Nom. Mus. Hein. Orn., 1890, 



264 (Brazil). 

 Rostrhamus sociabilis plumbeus Swann, Synop. Accip., pt. 3, 1922, 156, part 



(Central America).— Peters, Bull. Mus. Comp. Zool., Ixix, No. 12, 1929, 418 



(Toloa Lagoon, Honduras); Check-list Birds of the World, i, 1931, 201, part 



(distr., Central America). — Stone, Proc. Acad. Nat. Sci. Philadelphia, 1932, 



299 (Honduras).— Griscom, Auk, 1, 1933, 298 (Bebedero, Costa Rica). 



ROSTRHAMUS SOCIABILIS PLUMBEUS Ridgway 



Everglade Snail Kite 



All plumages similar to corresponding plumages of typical sociabilis, 

 but with longer wings. 



Adult male.—Wmg 340-368 (356.7); tail 170-191 (182.5); culmen 



