BIEDS OF NORTH AND MIDDLE AMEEICA. 543 



Caprimulgus latieatidatus Dbapiez, Diet. Class. Hist. Nat., vi, 1824, 169 (see Cas- 



sin, Proc. Ac. Nat. Sci. PMla., 1851, 182). 

 NJyctidromTu] albicollia (typicus) Habtbet, Tierreich, Podarg., Caprim., 



Macropt., 1897, 32, part. 

 Nyctidromus albicollis merrilli (not of Sennett) Lantz, Trans. Kansas Ac. Sci. for 



1896-97 (1899), 220 (Naranjo and Santo Tomas, Guatemala). 

 (1) Nyctidromus albicollis gilvus Bangs, Proc. New Engl. Zool. Club, iii, March 



31, 1902, 82 (Santa Marta, Colombia; coll. E. A. and O. Bai^s). — Allen, 



Bull, Am. Mus. N. H., xvi, 1905, 281 (Bonda and Don Diego, Santa Marta; 



descr. eggs). 



NYCTIDROMUS ALBICOLLIS YUCATANENSIS Nelson. 



YUCATAN OTTrfijO. 



Similar to N. a. albicollis but larger and paler; similar also. to N. a. 

 nerriUi but smaller and darker. (TJie grayish phase seems to largely 

 predominate in this form, only one specimen among the seventeen 

 sxamined being in the rufescent plumage.) 



Adult maZe.— Length (skios), 263-300 (283); wing, 163.5-175.5 

 ;i67.9); tail, 141-165 (156.7); exposed culmen, 12-14 (13.2); tarsus, 

 24-28 (25.9); middle toe, 19-23.5 (21.2).» 



Adult female. — ^Length (skins), 251-263 (256); wing, 157.5-170 

 ;i62.7); tail, 132-154 (141.8); exposed culmen, 12t13.5 (12.7); tar- 

 lus, 23.5-26.5 (24.7); middle toe, 20-22 (21).* 



Eastern Tabasco (Montecristo), Campeche (Apazote), Yucatan 

 ^I^rida; Tunkas; Chichen-Itza; Xbac; Shkolak; Ticlil; Tem^x; 

 Peto; Buctzotz; Mugeres Island; Cozum§l Island), and British 

 Honduras (forest near Manatee Lagoon, March, August; Toledo 

 District, January; Orange Walk?; Belize). 



Nyctidromus albicollis (not Caprimulgus albicollis Gmelin) Lawrence, Ann. Lye. 

 N. Y., ix, 1869, 204 (Merida, Yucatan). — ^Boucakd, Proc. Zool. Soc. Lond., 

 1883, 45 (Yucatan). — Salvin, Ibis, 1889, 368 (Mugeres and Cozumel islands, 

 Yucatan).— Stone, Proc. Ac. Nat. Sci. PMla., 1890, 206 (Tunkas, Shkolak, 

 and Ticul, Yucatan). — Haetbet, Cat. Birds Brit. Mus., xvi, 1892, 587, 

 part. — Salvin and Godman, Biol. Centr.-Am., Aves, ii, 1894, 393, part (Peto, 

 Buctzotz, Temax, Tunkas, Shkolak, Ticul, Merida, Mugeres I., and Cozumel 

 I., Yucatan; Orange Walk and Belize, Brit. Honduras?). 



Nyctidromus albicollis merrilli (not of Sennett) Chapman, Bull. Am. Mus. N. H., 

 viii, 1896, 285 (Chichen-Itza, Yucatan; habits; notes). 



Nyctidromus albicollis yucatanensis Nelson, Proc. Biol. Soc. Wash., xiv, Septem- 

 ber 25, 1901, 171 (Tunkas, Yucatan; coll. IT. S. Nat. Mus.).— Cole, Bull. 

 Mus. Comp., Zool., 1, 1906, 127 (Chichen-Itza). 



NYCTIDROMUS ALBICOLLIS SUMICHRASTI Ridgway. 



SUMICHBAST'S Ctri^JO. 



Similar in coloration to N. a. albicollis but much larger; interme- 

 liate in size between N. a. merrilli and N. a. nelsoni but much darker 

 han either; larger and decidedly darker than N. a. yucatanensis. 



o Twelve specimens. •> Six specimens. 



