166 BULLETIN 50, UNITED STATES NATIONAL MUSEUM 



Porsana oinereiceps Lawkencb, Ann. Lye. Nat. Hist. New York, xi, 1875, 90 (Tala- 

 manca, e. Costa Rica; coll. U. S. Nat. Mus.)— Kidgwat, Proc. U. S. Nat. Mus., 

 i, 1S78, 252, in text (Costa Rica) ; vi, 1884, 409, footnote (diagnosis). — 

 Zeledon, Proc. U. S. Nat. Mus., viii, 1885, 114 (Costa Rica). 



Creciscus cinereiceps Shabpe, Cat. Birds Brit. Mus., xxiii, 1894, 141, footnote, 

 337 (Rio Escondido, Nicaragua). — Salvin and Godman, Biol. Oentr.-Amer., 

 Aves, iii, 1903, 325, part (Greytown, Bluefields, Rio Escondido, and Los 

 Sabalos, e. Nicaragua; Talamanca, Pacuarito, Desamparados, Jimenez, 

 Reventazon, Pacuare, Sipurio, Juan Vifias, Azahar de Cartago, Carillo, and 

 Rio Frio, Costa Rica). — Cabbikkb, Ann. Carnegie Mus., vi, 1910, 410 (Juan 

 Vinas, ReTentaz6n, Carillo, Cariblanco de SerapiquI, Cach6, Guapiles, and 

 Bonilla, Costa Rica; habits).— Cooke, U. S. Dept. Agr. Bull. 128, 1914, 36 

 (range). — Peiees, BuU. Mus. Comp. Zool., Ixxi, 1931, 301 (Almirante and 

 vicinity; Changuinola, Guabo, Panama). 



lAmnocrex cinereiceps Ridqwat, Smiths. Misc. Coll., Ixxii, No. 4, 1920, 4. 



Porxana leucogastra Ridgway, Proc. U. S. Nat. Mus., vi, 1884, 408 (Los Sabol6s, e. 

 Nicaragua; U. S. Nat. Mus.). 



P[orzana] leucogastra Ridgway, Proc. U. S. Nat. Mus., x, 1888, 111 (diagnosis; 

 range). 



Crecisctts leucogaster Shabpe, Cat. Birds Brit. Mus., xxiii, 1894, 140 footnote. 



[Creciscus'] leucogaster Shabpe, Hand-list, i, 1899, 105. 



Laterallus alMgularis cinereiceps Petees, Check-list Birds of World, ii, 1934, 190. — 

 Griscom, Bull. Mus. Comp. Zool., Ixxviii, 1935, 304, (Panama, Caribbean 

 Slope east of Rio Calovevora ; Nicaragua to -w. Panamd). 



LATERALLUS ALBIGULARIS ALBIGULARIS (Lawrence) 



Panamanian Whitb-thboated Rail 



Adult (sexes alike), darh phase. — Similar to the corresponding 

 phase of Laterallus albigularis cinereiceps, but with the forehead, 

 crown, and occiput bright sepia to bright Prout's brown ; the upper- 

 parts of the body more brownish, warm sepia to Prout's brown in- 

 stead of bister; lores, cheeks, and auriculars Mikado brown to deep 

 russet and hazel; chin purer white; size averaging slightly larger. 



Adult (sexes alike), pale phase. — Similar to the pale phase of Lat- 

 erdUus albigularis cinereiceps, but with the same differences on the 

 head and upper parts as in the dark phase. 



Jv/venal (sexes alike). — Similar to the corresponding stage in ci/ne- 

 reiceps but more rufescent above; the upperparts of the body Brus- 

 sel's brown to raw umber instead of clove brown, the top of the head 

 sepia instead of bister ; the sides of head and neck, and the breast and 

 abdomen lightly tinged with pinkish cinnamon. 



Natal down. — Not recorded. 



Adult male.—Wmg, 73-80.5 (76.8) ; tail 25.5-34 (29.1) ; exposed 

 culmen 16-19 (18.1) ; tarsus 27-32 (29.7) ; middle toe without claw 

 29-36 (32.3 mm.).«* 



' Sixteen specimens from Panama and Colombia. 



