PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 143 



whether they should not all be included under Caprimnlgus. The only 

 alternative seems to be a further subdivision of one or more of the so- 

 called genera, especially "Antrostomus", leaving A. carolinensis as the 

 typical and only species, referring A. vociferus to Caprimulgtis, and insti- 

 tuting a new genus for A. nuttalli. The following scheme may serve to 

 show the nature of the differences between the three North American 

 species usually included in Antrostomus and the genus Nyctidromus ; — 



A. — Tarsus feathered in front almost to the toes, and shorter than the middle toe ; first 



quill longer than the fourth. 



1. Caprimulgus. — Rictal bristles without lateral filaments. Sexes with the tail 



differently marked. Tail rounded. (Including C. vociferus.) 



2. "Antrostomus." — Rictal bristles with fine lateral filaments. Sexes with the 



tail differently marked. Tail rounded. (Including only the type, A. caroli- 

 nensis.) 



B. — Tarsus entirely naked in front, and longer than the middle toe ; first quill shorter 



than the fourth. 



3. — Tail even, much shorter than the wing. Sexes with the tail not differently 



marked. Plumage with a peculiarly soft, velvety surface. (C. nuttalli only.) 



4. Nyctidromus. — Tail rounded, equal to the wing. Sexes with the tail differently 



marked. 



116. * Nyctidromus albicollis. — Pauraque Goatsucker. 



Montvoyan de la Guyane, Buff., Hist. Nat. des Ois. VI, 1779,549. 

 Crepaud-volant ou Tette-Chevre roux, de la Guiane, Buff., PI. Enl. 733 (=9 )• 

 White-throated Goatsucker, Lath., Synop. II, pt. ii, 1785,596, No. 7. 

 Guiana Goatsucker, Lath., t. c. 598, No. 9. 



Caprimulgus albicollis, Gmel., S. N. I, ii, 1788, 1030 (ex Lath., I. c). — Lath., Ind. 

 Orn. II, 1790, 575, No. 7.— Vieill., Enc. Me'th. 1823, 536, No. 4.— Licht., 

 Verz. Doubl. 1823, 59, 606.— D'Orb., Guerin's Mag. 1837, 67.— Hartl., Ind. 

 Azara, 1847, 20, 310.— D'Orb. & Lafr., Kev. Zool. 1837, 67.— Caban., in 

 Schomb. Guiana, III, 1848, 710, No. 204. 

 Nyctidromus albicollis, Burm., Th. Bras. II, 1856, 389, No. 1.— Scl., P. Z. S. 1866, 

 124 (fig. of bones of foot), 144 (S. Mexico to S. Brazil). — Scl. & SALV.,i&. 

 193 (Ucayali, E. Peru); 1867, 752 (Huallaga, E. Peru), 978 (Upper Ama- 

 zon) ; 1869, 252 (Maruria, Venezuela), 598 (Conispata, Peru) ; 1870, 782 (S. 

 of Merida, Venezuela), 837 (coast of Honduras); 1873, 186 (Feru), 290 (E. 

 Peru); 1875, 237 (Venezuela); Norn. Neotr. 1873, 97 (Central America; S. 

 Am. to Brazil).— Lawr., Ann. Lyc. N. Y. IX, 1869, 204 (Yucatan); Pr. 

 Boston Soc. 1871, — (Tres Marias Islands, W. Mexico; common); Mem. 

 Boston Soc. II, 1874, 291 (Mazatlan, Colima, and Tres Marias, W. Mexico); 

 Bull. U. S. Nat. Mus. No. 4, 1876, 31 (Isth. Tehuantepec).— Wyatt, Ibis, 

 1871, 375 (L. Paturia, New Granada).— Lee, Ibis, 1873, 134 (Buenos 

 Ayres).— Layard, ib. 389 (Para>— Merrill, Bull. Nutt. Orn. Club, I, Nov. 

 1876, 88 (Fort Brown, Texas, April and May; not rare ; breeding). 



Caprimulgus guianensis, Gmel., S. N. I, ii, 1788, 1030 (based on Buff., PI. Enl. 

 733).— Lath., Ind, Orn. II, 1790, 586, No. 8.— Max.. Beitr. Ill, 1831, 318, No. 4. 

 Nyctidromus guianensis, Cass., P. A. N. S. 1851, 183, 189 (Cayenne ; Surinam); 

 Catal. Caprim. Mus. Phila. Acad. 1851, 12.— Burm., Syst. Ueb. II, 1856, 

 391.— Scl., Catal. Am. B. 1862,281, No. 1690 (Orizaba ; Bogota; Vera Paz; 

 Esmeraldas, Ecuador ; Trinidad) ; P. Z. S. 1864, 176 (City of Mexico).— 

 Taylor, Ibis, 1864, 90 (Trinidad).— Lawr., Ann. Lyc. N. Y. VII, 1861,290 

 (Isth. Pan am a).— Scl. & Salv., P.Z.S. 1864,364 (Isth. Panama).— Pelz., 

 Orn. Bras. 1871, 13.— Salvin, P. Z. S. 1870, 204 (Veragua). 



