546 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Tres Marias Islands, western Mexico. 



Nyctidromus albicollis (not Caprimulgus albicollis Gmelin) Grayson, Proc. Bost. 



Soc. N. H., xiv, 1871 (1872), 272 (Tres Mariaa Islands).— Lawrence, Mem. 



Bost. Soc. N. H., ii, 1874, 291, part (Tres Marias).— Hartert, Cat. Birds 



Brit. Mus., xvi, 1892, 587, part (Tres Marias).— Salvin and Godman, Biol. 



Centr.-Am., Aves, ii, 1894, 393, part (Tree Marias). 

 Nyctidromus albicollis insularis Nelson, Proc. Biol. Soc. Wash., xii, Jan. 27, 1898, 



9 (Maria Madre Island, Tres Marias group, w. Mexico; coll. U. S. Nat. Mus.); 



North Am. Fauna, no. 14, 1899, 44 (Tres Marias; habits). 

 [Nyctidromus] insularis Sharpe, Hand-list, ii, 1900, 83. 



NYCTIDROMUS ALBICOLLIS MERRILLI Sennett. 



MEKRILL'S CUlf JO. 



Similar in coloration to the grayish phase of N. a. nelsoni but much 

 larger; decidedly larger and darker than the grayish phase of N. a. 

 yucatanensis; larger and paler than grayish phase of N. a. sumicJirasti. 



Adult maZe.— Length (skins), 300-305 (303); wing, 173-187.5 

 (182.1); tail, 169-182.5 (176.6); exposed culmen, 11.5-12 (11.9); 

 tarsus, 27-28.5 (27.7); middle toe, 21.5-22.5 (22).« 



Adult female.— Length (skins), 264-290 (288); wing, 164.5-177.5 

 (170.1); tail, 147.5-156 (150.4); exposed culmen, 11.5-13.5 (12.6); 

 tarsus, 25-27 (25.6); middle toe, 20-21.5 (20.9).^ 



Lower Rio Grande Valley and southern GuK coast of Texas 

 (Hidalgo, Cameron, Nueces, San Patricio, Aransas, and Refugio 

 counties), and southward into Tamaulipas (Soto la Marina; Alta 

 Mira; Tampico); in winter south to Vera Cruz (IMirador) and Puebla 

 (Metlaltoyuca; Tehuacan?; Mazatiopam?). 



Nyctidromus albicollis (not Capriviulgus albicollis Gmelin) Merrill (J. C), Bull. 

 Nutt. Orn. Club, i, 1876, 88 (Ft. Brown, Texas, breeding); Proc. U. S. Nat. 

 Mus., i, 1878, 145 (Ft. Brown and Hidalgo, Texas; habita; descr. nest and 

 eggs).— RiDGWAY, Proc. U. S. Nat. Mu8.,i, 1878, 143, part, pis. 1, 2 (generic 

 outlines; synonymy; description); iii, 1880, 188, 233; Nom. N. Am. Birds, 

 1881, no. 356.— Allen, Bull. Nutt. Orn. Club, v, 1880, 90.— America>5 

 Ornithologists' Union, Check List, 1886, no. 419.— Hancock, Bull. Ridgw. 

 Orn. Club, no. 2, 1887, 17 (Nueces R., near Corpus Christi, Texas, 1 spec, 

 April 16). 



N[yctidromu^] albicollis Coues, Key N. Am. Birds, 2d ed., 1884, 450.— Ridgway, 

 Man. N. Am. Birds, 1887, 300. 



Nyctidromus americanus (not Caprimulgus americanus Linnaeus) Sennett, Bull. 

 U. S. Geol. and Geog. Surv. Terr., v, 1879, 409 (Lomita Ranch, Texas; habits; 

 descr. eggs). 



Nyctidromus albicollis merrilli Sennett, Auk, v, no. 1, Jan., 1888, 44 (Nueces R., 

 Nueces Co., Texas; coll. G. B. Sennett). — American Ornithologists' 

 Union, Suppl. to Check List, 1889, 22; Check List, 2d ed., 1895, no. 419; 3d 

 ed., 1910, 198.— Rhoads, Proc. Ac. Nat. Sci. Phila., 1892, 106 (Corpus Christi; 

 breeding).— Bendire, Life Hist. N. Am. Birds, ii, 1895, 160, pi. 2, figs. 1, 2 

 (eggs). — Carroll, Auk, xvii, 1900, 344 (Refugio Co., Texas, breeding).— 

 Bailey (Florence M.), Handb. Birds W. U. S., 1902, 225. 



ffl Four specimens. ^ Nine specimens. 



