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 Blas; Tepic). 
Trochilus (t—————?) auriceps Gout, Jardine’s Contr. Orn., 1852, 137 (Mexico; 
coll. J. Gould). 
[Sporadinus] auriceps BONAPARTE, Rev. et Mag. de Zool., 1854, 225. 
Chlorostilbon auriceps Goutp, Mon. Troch., v, pt. xiii, May, 1857, pl. 350.— 
SancHez, An. Mus. Nac. Mexico, i, 1877, 96 (Valley of Mexico).—VinLapa, 
La Naturaleza, ii, 1874, 361 (Valley of Mexico).—D’Oca, Troq. de Mex., 
1875, 38, pl. (8), fig. 27; La Naturaleza, iii, 1875, 160 (Valley of Mexico).— 
Exx107, Ibis, 1875, 168 (synon.; crit.); Classif. and Synop. Troch., 1879, 243.— 
Herrera, La Naturaleza, (2), i, 1891, 322 (Valley of Mexico).—Satvin and 
Gopman, Biol. Centr.-Am., Aves, ii, 1892, 262.—Sa.vin, Cat. Birds Brit. 
Mus., xvi, 1892, 45 (Santiago and San Blas, Tepic; Tonila, Jalisco; Chil- 
pancingo and Acahuizotla, Guerrero).—Jouy, Proc. U. 8. Nat. Mus., 
xvi, 1893, 784 (San Marcos, s. Jalisco)—Harrert (E. and C.), Novit 
Zool., i, 1894, 61 (Chilpancingo, Guerrero; descr. nest and eggs). 
C[hlorostilbon] auriceps Sauvin, Ibis, 1889, 366, in text. 
[Chlorostilbon] auriceps SctaTeR and Satvin, Nom. Av. Neotr., 1873, 94.— 
SHarpe, Hand-list, ii, 1900, 112. 
C[hlorostilbon] auriceps Hxine, Journ. fiir Orn., 1863, 200.—Hartert, Das 
Tierreich, Troch., 1900, 74 (monogr.). 
C[hlorolampis] auriceps CaBANIS and Hetnz, Mus. Hein., iii, 1860, 48, footnote.— 
Herve, Journ. fiir Orn., 1863, 200. 
Chlorolampis auriceps Goutp, Introd. Troch., oct. ed., 1861, 174.—Muisant 
and VERREAUX, Hist. Nat. Ois.-Mouch., ii, livr. 1, 1875, 79; iv, livr. 3, 
1878, 198.—BovucarD, Notes Troch. du Mex., 1875, 13; Gen. Hum. Birds, 
1894, 113. 
[Chlorolampis] auriceps Mutsant, Ann. Soc. Linn. Lyon, n. s., xxii, 1876, 209. 
[Hylocharis] auriceps Gray, Hand-list, i, 1869, 149, no. 1934. 
CHLOROSTILBON FORFICATUS Ridgway. 
COZUMEL EMERALD. 
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 
« Two specimens. 
