BIRDS OF NORTH AND MIDDLE AMERICA 107 



ceeding the moderately elongated proximal secondaries ; third primary 

 (from outside) longest, the second and fourth a little shorter, the outer- 

 most about equal to seventh. Tail about two-fifths as long as wing, the 

 rectrices with very loose, semidecomposed webs and decumbent dis- 

 tally. Tarsus much longer than middle toe without claw (longer than 

 middle toe with claw), the acrotarsium with a single continuous row 

 of broad transverse scutella, the acrotarsium planta tarsi with a single 

 row of similar but narrower scutella ; outer toe with claw falling decid- 

 edly sliort of base of middle claw, the iimer toe, without claw, falling 

 short of penultimate articulation of middle toe ; hallux, without claw, 

 shorter than basal phalanx of outer (very much shorter than that of 

 inner) toe; claws short, acute, moderately curved. 



Plumage and coloration. — Plumage in general full and rather lax, 

 that of forepart of head rather coarse, semierect on laterofrontal 

 region; primaries very broad; feathers of alula broad, with rounded 

 tips, the longest reaching nearly to tips of longest primary coverts; 

 rectrices rather narrow, soft, loosely webbed, decurved or decumbent 

 distally. Color wholly plain rufescent, darker and duller above. 



Range. — Continental Tropical America; Jamaica. (Monotypic.) 



KEY TO THE SUBSPECIES OF AMAUROLIMNAS CONCOLOR 



a. Upperparts somewhat rufescent olive sepia ; underparts pale, the breast rich 



tawiiy to light hazel Amaurolimnas concolor concolor (p. 108) 



aa. Upperparts usually olivaceous raw umber ; underparts dark, the breast 

 deep hazel to bright russet. 

 6. Size larger ; wings 127-136 mm. 



Amaurolimnas concolor castaneus (extralimital) ^ 

 6&. Size smaller, wings 110-125 mm. 



Amaurolimnas concolor guatemalensis (p. 109) 



' Amaurolimnas concolor castaneus. — Ralhis castaneus Pucheran, Rev. Mag. 

 Zool., 1851, 279 (ex Cuvier mss. ; Brazil). — [Rufirallus] castaneus Bonaparte, 

 Compt. Rend., xliii, 1856, 599. — Rallma castanea Schlegel, Mus. Pays-Bas, v. 

 No. 30., livr. 7, 1865, 17, part (Brazil). — Porzana concolor Scl'^ter and Salvin, 

 Proc. Zool. See. London, 1SG8, 452, part (Bahia) ; Pelzeln, Orn. Bras., 1870, 

 316, part. — [Porzana'\ concolor Pelzeln, Orn. Bras., 1870, 459, part; Sclater and 

 Salvin, Nom. Av. Neotr., 1873, 140, part (Brazil). — Amaurolimnas coyicolor 

 Sharpe, Cat. Birds Brit. Mus., xxiii, 1894, 87, part (Bahia, Brazil) ; Ihering, 

 Rev. Mus. Paulista, iv, 1900, 280 (descr. eggs) ; Salvin and Godman, Biol. 

 Centr.-Amer., Aves, iii, 1903, 321, part (Brazil) ; Cooke, U. S. Dept. Agr. Bull. 

 128, 1914, 26, part (Brazil) ; ? Naumburg, Bull. Amer. Mus. Nat. Hist, Ix, 

 1930, 72, part (distr. in Brazil; Sao Paulo — Iguape, Ubatftba, Bahia). — 

 [Amaurolimnas'] concolor Sharpe, Hand-list, i, 1899, 201, part (Brazil) ; Ihering 

 (H. and R.), Aves Brazil, 1907, 39 (Sao Paulo; Bahia) ; Brabourne and Chubb, 

 Birds South America, i, 1912, 23 part (Brazil). — Amaurolimnas concolor guate- 

 malen-sis Peters, Cheek4ist Birds of World, ii, 1934, 171, part (Sao Paulo). 



