552 BULLETIN 50, UNITED STATES NATIONAL MUSEUM, 



and dusky (glossed with greenish blue) basal areas; remiges dusky, 

 faintly glossed with purplish; a dusky suborbital-auricular area, 

 margined above by a grayish white postocular streak; under parts 

 light gray, paler on abdomen and anal region; femoral and lumbar 

 tufts white; maxilla dusky, mandible pale brownish (in dried skins), 

 dusky at tip; feet dusky; length (skins), 83-85 (84); wing, 43-44 

 (43.5); tail, 30-33.5(31.7); middle rectrices, 17-20.5 (18.7); culmen, 

 13-15.5 (14.2).« 



Southwestern and west-central Mexico, in States of Mexico (Valley 

 of Mexico), Guerrero (Acahuitzotla; Chilpancingo) and Jalisco (San 

 Marcos; Tonila) and Territory of Tepic (Santiago; San Bias; Tepic). 



Trochilus ( ?) auriceps Gould, Jardine's Contr. Om., 1852, 137 (Mexico; 



coll. J. Gould). 



[Sporadinus] auriceps Bonaparte, Rev. et Mag. de ZooL, 1854, 225. 



Chlorostilbon auriceps Gould, Mon. Troch., v, pt. xiii. May, 1857, pi. 350. — 

 Sanchez, An. Mus. Nac. Mexico, i, 1877, 96 (Valley of Mexico). — Villada, 

 La Natiiraleza, ii, 1874, 361 (Valley of Mexico).— D' Oca, Troq.de Mex., 

 1875, 38, pi. (8), fig. 27; La Naturaleza, iii, 1875, 160 (Valley of Mexico).— 

 Elliot, Ibis, 1875, 168 (synon.; crit.); Classif. and Synop. Troch., 1879, 243.— 

 Herrera, La Naturaleza, (2), i, 1891, 322 (Valley of Mexico). — SALvmand 

 GoDMAN, Biol. Centr.-Am., Aves, ii, 1892, 262. — Salvin, Cat. Birds Brit. 

 Mus., xvi, 1892, 45 (Santiago and San Bias, Tepic; Tonila, Jalisco; Chil- 

 pancingo and Acahuizotla, Guerrero).— Jouy, Proc. U. S. Nat. Mus., 

 xvi, 1893, 784 (San Marcos, s. Jalisco). — Hartert (E. and C), Novit 

 ZooL, i, 1894, 61 (Chilpancingo, Guerrero; descr. nest and eggs) . 



C[hlorostilbon] auriceps Salvin, Ibis, 1889, 366, in text. 



[Chlorostilbon] auriceps Sclater and Salvin, Nom. Av. Neotr., 1873, 94. — 

 Sharpe, Hand-list, ii, 1900, 112. 



C[hlorostilbon] auriceps Heine, Joum. ftir Om., 1863, 200. — Hartert, Das 

 Tierreich, Troch., 1900, 74 (monogr.). 



C[hlorolampis] auriceps Cabanis and Heine, Mus. Hein., iii, 1860, 48, footnote. — 

 Heine, Journ. fiir Orn., 1863, 200. 



Chlorolampis auriceps Gould, Introd. Troch., oct. ed., 1861, 174. — Mulsant 

 and Verreaux, Hist. Nat. Ois.-Mouch., ii, livr. 1, 1875, 79; iv, livr. 3, 

 1878, 198.— BouCARD, Notes Troch. du Mex., 1875, 13; Gen. Hum. Birds, 

 1894, 113. 



[Chlorolampis] auriceps Mulsant, Ann. Soc. Linn. Lyon, n. s., xxii, 1876, 209. 



[Hylocharis] auriceps Gray, Hand-list, i, 1869, 149, no. 1934. 



CHLOROSTILBON FORFICATUS Ridgway. 



COZUMEL EMEHALD. 



Similar to C. auriceps, but larger; adult male with lateral rectrices 

 broader and less tapering, and middle rectrices less broadly tipped 

 with brownish gray. 



Adult male. — Pileum brilliantly metallic golden green or golden; rest 

 of upper parts, including wing-coverts, duller, but still bright, golden 

 green; tail glossy blue-black or black glossed with metallic blue, the 

 six middle rectrices abruptly tipped with deep brownish gray; remiges 



o Two specimens. 



