544 BULLETIN" 50, UNITED STATES NATIONAL MUSEUM. 



Adult male.— Length (skins), 285-306 (296); wing, 165.5-175 (171); 

 taQ, 158-169.5 (163.7); exposed culmen, 12.5-15 (13.5); tarsus, 

 25-28.5 (26.7); middle toe, 20.5-22.5 (21.3).^^ 



Adult female.— Length, (skins), 248-271 (257); wing, 159.5-164 

 (162.1); tail, 135-150 (144.5); exposed culmen, 11-14 (12.2); tarsus, j 

 23.5-26.5 (24.7); middle toe, 18-20.5 (19.3).^ 



Southeastern Mexico, in States of Vera Cruz (Rivera; Orizaba; 

 Mirador; 75 mUes southwest of Tampico; Omealca; Cordova ?;<= 

 Jalapa?;'' Misantla?;« Coatepec?;" Huatusco?;" Rio Rancho 

 Nuevo ?; «= Santa Ana ?; " Playa Vicente ? <=) and Tabasco (Frontera, 

 March; Teapa, March) ; southern Tamaulipas (Tampico)?;'' Puebla 

 (Tehuacan; Mazatiopam) ?.<= 



{'i)Nyctidromus americanus (not Caprimulgus americanus Liimseus) Sclater, Proc. 



Zool. Soc. Lond., 1856, 285 (Cordova, Vera Cruz; crit); 1859, 367 (Jalapa, 



Vera Cruz). 

 {?)N'yctidwmus americanus? Sclater and Salvin, Ibis, 1859, 125, part (Mexico; 



crit.). 

 (?)]V[yctidromus] americanus Cabanis and Heine, Mus. Hein., iii, 1860, 92, part 



(Jalapa). 

 (?)Nyctidromus alhicollis (not Capnmulgus albicollis Gmelin) Sclater, Proc. Zool. 



Soc. Lond., 1866, 144, part (monogr.; s. Mexico). — Ferrari-Perez, Proc. 



TJ. S. Nat. Mus., ix, 1886, 158 (Teliuacan, Puebla).— Hartert, Cat. Birds 



Brit. Mus., xvi, 1892, 587, part (Tampico?, Misantla, Jalapa, Orizaba, Playa 



Vicente, and Teapa, Mexico). — Salvin and Godman, Biol. Centr.-Am., ii, 



1894, 393, part (Misantla, Jalapa, Coatepec, Huatusco, Rio Rancho Nuevo, 



Santa Ana, Orizaba, Cordova, and Playa Vicente, Vera Cruz; Mazatiopam, 



Puebla; Tampico, s. Tamaulipas; Teapa, Tabasco). 

 (?)Nyctidromus albicollis vierrilli (not of Sennett?) Chapman, Bull. Am. Mus. 



N. H., X, 1898, 34 (Jalapa). 

 {?)N[yctidromus\ albicollis (typicus) Hartert, Tierreich, Podarg., Caprim. 



Macropt., 1897, 32, part (Mexico). 

 Nyctidromus albicollis sumichrasti Ridgway, Proc. Biol. Soc. Wash., xxv, May 4, 



1912, 91 (Frontera,*^ Tabasco, s. Mexico; coll. U. S. Nat. Mus.). 



NYCTIDROMUS ALBICOLLIS NELSONI Ridgway. || 



NELSON'S CTJl£jO. 



Decidedly larger than N. a. albicollis, with grayish phase much 

 paler and tawny phase averaging lighter and brighter, with buff 

 markings of upper parts broader; gray phase similar in coloration to 

 that of N. a. merrilli, but size much less. 



o Three specimens. 



f> Five specimens. 



c Not having seen specimens from these localities I can not be sure that they 

 represent the present form. Some of them, at least, doubtless do; but others may be 

 N. a. merrilli, which in winter extends its range southward to Vera Cruz and Puebla. 



(!■ By error, the type locality was given in the original description as Teapa instead 

 of Frontera. 



