PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 143 



wlietbor tbey should not all be included under Caprimiilgiis. The only 

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

 called genera, especially '■'■Antrostoiims''\ leaving A. carolinensis as the 

 typical and only species, referring A. vocifcrus to Caprimulgus, and insti- 

 tuting a new genus for A. nuttaUi. 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 featliered in front almost to the toes, aud shorter tbau the middle toe ; first 

 quill longer than the fourth. 



1. Caprimulgxis. — 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 diff'erently 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 difi"erently 

 marked. Plumage with a peculiarly soft, velvety surface. (('. nuttalU only.) 



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

 marked. 



116. * Nyctidromus albicollis. — Pauraque Goatsucker. 



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



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



Wliite-throaied Goatsucker, LiATU., Synop. II, pt. ii, 1785,596, No. 7. 



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



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

 Orn. II, 1790, 575, No. 7.— Vieill., Enc. M6th. 1823, 536, No. 4.— Light., 

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

 Azara, 1847, 20, 310.— D'Orb. & Lafr., Rev. 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 (Iluallaga, 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 (Peru), 290 (E 

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

 Am. to Brazil).— Lawr., Ann. Lye. 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 Trcs 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, i7>. 389 (Parii).— Merrill, Bull. Nutt. Orn. Club, I, Nov. 

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



Caprimulgus (juianensis, 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. IJeb. 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).— 

 Tay^lor, Ibis, 1864, 90 (Trinidad).— Lawr., Ann. Lye. N. Y. VII, 1861,290 

 (Isth. Panama).— ScL. «t Salv., P.Z.S. 1864,364 (Isth. Panama).- Pelz., 

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



