12 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
[Parra] gymnostoma ScuaTER and Satvin, Nom. Av. Neotr., 1873, 142, part. 
J [acana] gymnostoma Ripeway, Man. N. Am. Birds, 1887, 183, part. 
Jacana gymnostoma ZEvEDON, Proc. U. 8. Nat. Mus., vill, May 25, 1885, 114 
(Costa Rica); Anal. Mus. Nac. C. R., i, 1888, 31 (Las Trojos de Alajuela and 
Siquirres, Costa Rica). 
JACANA SPINOSA GYMNOSTOMA (Wagler). 
MEXICAN JACANA. 
Similar to J. s. spinosa but averaging slightly larger (except bill 
and feet), frontal shield smaller, and adults with color of under parts 
duller, often tinged with brownish, and less abruptly defined against 
the greenish black of chest. 
Adult male.—Wing, 112-124 (119.9); tail, 38-45 (41.3); bill from 
nostril, 16.5-19.5 (17.5); from posterior edge of frontal shield, 36.5- 
45.5 (41.5); tarsus, 46.5-55 (52); middle toe, 45-54 (51.3).° 
Adult female.—Wing, 130-139 (135.1); tail, 43-52 (46.5); bill from 
nostril, 17.5-20 (19.2), from posterior edge of frontal shield, 40—49.5 
(46.2); tarsus, 51-57 (54.3); middle toe, 48.5-56 (53.1).° 
Mexico, in States of Chiapas (Tonal), Tabasco (Teapa; San Juan 
Bautiste), Yucatén (Buctzotz; Shkolak; Cozumel Island), Oaxaca 
(Santa Efigénia; Zonétepec); Guerrero (Acapulco), Colima (Man- 
zanillo Bay; Rio Zacatula; Rio de Coahuyana), Michoacén (Lake 
Patzcuaro; Huinga), Jalisco (Zapotlan; Ocotlin; Guadalajara), 
Sinaloa (Mazatlan; Presidio de Mazatlén), Guanajuato, Puebla 
(Laguna de Epatlin), Vera Cruz (Jalapa; Jomotla; Jonatél; Santa 
Ana; Tlalcotalpam; Cosamaloapém; Alvarado), and Tamaulipas 
(Tampico, Alta Mira), and Territory of Tepic (San. Blas; Santiago; 
Tepic), and lower Rio Grande Valley in Texas (Fort Brown; Browns- 
ville). 
Parra jacana (not of Linnezus) Bonaparte, Proc. Zool. Soc. Lond., 1837, 114 
Mexico; crit.). 
Parra gymnostoma Waeter, Isis, 1831, 517 (Mexico).—SchaTeR and Satvin, 
Proc. Zool. Soc. Lond., 1856, 283, part (Mazatlan, Sinaloa; Acapulco, Guer- 
rero; monogr.).—LAWRENCE, Mem. Bost. Soc. N. H., ii, 1874, 312 (Mazatlan; 
Manzanillo Bay, Rio Zacatula, and Rio de Coahuyana, Colima; habits; 
descr. nest and eggs); Bull. U. 8. Nat. Mus., no. 4, 1876, 50 (Santa Efigenia; 
Zonatepec).—Meraitt (J. C.), Bull. Nutt. Orn. Club, i, 1876, 88 (Fort Brown, 
Texas); Proc. U. S. Nat. Mus., i, 1878, 168 (Fort Brown).—Rineway, Proc. 
U.S. Nat. Mus., i, 1878, 167, part, pl. 3 (synonymy, descr., etc.); iii, 1880, 201; 
Nom. N. Am. Birds, 1881, no. 568.—Atten, Bull. Nutt. Orn. Club, v, 1880, 
91 (Fort Brown, Texas).—Coves, Check List, 2d ed., 1882, no. 672.—Saxvin, 
Proc. Zool. Soc. Lond., 1883, 428 (Acapulco, Guerrero); Ibis, 1889, 379 
(Cozumel Island).—Bovcarp, Proc. Zool. Soc. Lond., 1883, 462 (Yucatan).— 
Bairp, Brewer, and Ripaway, Water Birds N. Am., i, 1884, 176, part. 
[Parra] gymnostoma ScuaTer and Satvin, Nom. Av. Neotr., 1873, 142, part. 
Plarra] gymnostoma Cours, Key N. Am. Birds, 2d ed., 1884, 669, part. 
4 Hleven specimens. 
+ Nine specimens. Average measurements as given by Mr. Todd (A ‘ 
Mus., x, 218) are as follows: (Ann. Carnegie 
Adult males (nine specimens).—Wing, 117; tail, 41; “bill” (manner 
not stated), 29; tarsus, 49. ( of measurement 
Adult females (six specimens).—Wing, 133.5; tail, 46; “pall.” 91,9: tarsus, 62 
v 
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