138 BULLETIN 50, UNITED STATES NATIONAL MUSEUM 



Vojoa, and Tigre Island). — Griscom, Auk, 1, 1933, 298 (Costa Rica, Bebe- 

 dero; 2 spec; excessively local in Central America). — Nelson and Goldman, 

 Proc. Biol. Soc. Washington, xlvi, 1933, 193.— Fargo, Wils. Bull., xlvi, 1934, 

 177, in text (Ivissiminee Prairies, Fla., spec). — Eliot and Loetscher, 

 Auk, lii, 1935, 462, in text (Florida; nest building).— Van Tyne, Univ. 

 Michigan Mus. Zool., Misc. Publ. 27, 1935, 17 (Flores, Peten, Guatemala; 

 spec; meas.). — Bond, Birds West Indies, 1936, 72, part (possibly in West 

 Indies?).— Harper, Auk, liii, 1936, 386, in text (distr.).— Bent, U. S. Nat. 

 Mus. Bull. 167, 1937, 70 (life hist.).— Lack, British Birds, xxxi, 1937, 133 

 (food).— CoMPTON, Univ. California Publ. Zool., xlii. No. 3, 1938, 176, 185 

 (pterylosis). — Cottam and Knappen, Auk, Ivi, 1939, 149, in text (Florida; 

 spec; food habits). — McCabe, Bird-Banding, x, 1939, 140, in text (food 

 habits). — Sprunt, Auk, lix, 1942, 585, in text (Lake Okeechobee, Fla.; 

 nesting). — Hill, Auk, Ixi, 1944, 230 (meas). 



Rostrhamus plumheus Gurnet, Ibis, 1879, 338, in text, part (Florida), 341, part 

 (syn.); 1882, 455, 456, in text (crit.; measurements). 



Cymindes sociabilis plumbeus Oberholser, Auk, xli, 1924, 593, part (syn.). 



ROSTRHAMUS SOCIABILIS MAJOR Nelson and Goldman 



Mexican Snail Kite 



All plumages similar to corresponding stages of typical sociabilis, 

 but larger. 



Adult male.— Wing 370-382 (378.5), tail 187-202 (196.2), culmen 

 from cere 30.5-32 (31.4 mm.) (3 specimens). 



Subadult males— Wmg 367-380 (371.7); tail 190-198 (194); culmen 

 from the cere 30-33 (31.7); culmen including cere 38-41 (39.7); tarsus 

 51-53 (52 mm.) (3 specimens). 



Adult female. —Wing 365-372; tail 188-193; culmen from cere 29.5- 

 31.0 mm. (2 specimens). 



Range. — Lowlands of eastern Mexico in the province of Veracruz 

 and the Peten district of northern Guatemala. 



Type locality. — Catemaco, Veracruz, Mexico. 



Rostrhamus sociabilis Moore, Proc. Zool. Soc. London, 1859, 52 (Peten, Guate- 

 mala).— Sclater and Salvin, Ibis, 1859, 219 (Petdn and Pacific coast dis- 

 trict, Guatemala); Nom. Av. Neotr., 1873, 121, part (Mexico).— Gray, 

 Hand-list, i, 1869, 27, No. 251, part. — Ridgwat, Proc. Acad. Nat. Sci. 

 Philadelphia, 1870, 144, part.— Cubas, Cuadro Geogr., Estadlstico, Descr. e 

 Hist, de los Estados Unidos Mexicanos, 1884, 173 (common names; Mexico).— 

 Beristain and Laurbncio, Mem. y Rev. Soc. Cient. "Antonio Alzate," 

 vii, Nos. 7, 8, 1894, 224 (Veracruz, Mexico).— Sharpe, Hand-list, i, 1899, 

 269, part (e. Mexico). — Salvin and Godman, Biol. Centr.-Amer., Aves, iii, 

 1901, 99, part (San Andreas Tuxtla and Cosamaloapam, Veracruz; Pet^n, 

 Guatemala).— Reichenow, Die Vogel, i, 1913, 401, part.— Swann, Synopt. 

 List Accip., pt. 3, 1920, 99, part (e. Mexico). 



Rosthramus sociabilis Sumichrast, Mem. Boston Soc. Nat. Hist., i, 1869, 560 

 (hot region of Veracruz). 



Cymindes sociabilis Oberholser, Proc Biol. Soc. Washington, xxxv, 1922, 79, 

 part; Auk, xl, 1923, 679, part; Auk, xli, 1924, 593, part (syn.). 



Cymindes sociabilis ■plumbeus Oberholser, Auk, xli, 1924, 593, part. 



