144 MNIOTILTIDZ. 
SIURUS. 
Seiurus, Swainson, Zool. Journ. iii. p. 171 (1827). (Type Motacilla aurocapilla, Linn). 
Enicocichla (rectits Henicocichla), Gray, List Gen. B. p. 31 (1841). 
This genus has much in common with Dendreca, differing chiefly in the style of the 
coloration of its members, their habits and actions. ‘The rictal bristles are short, 
the wings long and pointed, and the tail nearly even, its undercoverts being fully 
developed. . 
Three species constitute the genus, all well-known birds; in addition to these a large 
race has recently been described from the Black Hills, Wyoming, as Stwrus nevius 
notabilis*. The others are regular migrants, spending their winters in Mexico, Central 
America, the Antilles, and the northern parts of South America, and their summers in 
North America, where they breed. 
A. Vertex fusco-aurantiacus, supercilia alba nulla. 
b] 
1. Siurus auricapillus. 
Motacilla aurocapilla, Linn. Syst. Nat. i. p. 884°. 
Seiurus aurocapillus, Sw. Phil. Mag. new ser. i. p. 369°; Lawr. Ann. Lye. N. Y. ix. pp. 94°, 200'; 
Baird, Rev. Am. B. i. p. 214°; Sumichrast, Mem. Bost. Soc. N. H.i. p. 547°; Frantz. J. 
f. Orn. 1869, p. 293"; Baird, Brew. & Ridgw. N. Am. B. i. p. 280°; Gundl. Orn. Cub. | 
p- 68°; Lawr. Mem. Bost. Soc. N. H. ii. p. 269"; Bull. U.S. Nat. Mus. no. 4, p. 14%. 
Siurus auricapillus, Scl. & Salv. Ibis, 1859, p.9”; Moore, P. Z.S. 1859, p.55™; Coues, Bull. 
Nutt. Orn. Club, ii. p. 31%; B. Col. Vall. i. p. 297”. 
Henicocichla aurocapilla, Scl. P.Z.S. 1856, p. 293°; Cab. J. f. Orn. 1861, p. 847; Lawr. Ann. 
Lyc. N.Y. viii. p. 180%; Scl. & Salv. P. Z. S. 1870, p. 886"; Salv. P. Z. 8. 1870, p. 183”. 
Turdus auricapillus, Licht. Preis-Verz. mex. Vogel, p. 2 (ct. J. £. Orn. 1863, p. 57”). 
Supra olivaceus, alis et cauda concoloribus, pileo fusco-aurantiaco nigro circumcincto; subtus albus, pectore toto 
et hypochondriis nigro guttatis, stria rictali nigra ; oculorum ambitu albido; rostri maxilla cornea, mandi- 
bula albicante ; pedibus carneis. Long. tota 5-1, alee 2:9, caude 2:1, rostri a rictu 0:6, tarsi 0-8. | (Deser. 
maris ex Choctum, Guatemala. Mus. nostr.) 
© mari omnino similis. 
Hab. Nortn AMERICA, eastwards of the Rocky Mountains, Alaska® °.—Merxico (Deppe ®, 
Sallé ©), Mazatlan (Grayson 1°), Tableland? (Bullock *), Orizaba &c. (Sumichrast® 6), 
Guichicovi, Tehuantepec (Sumichrast 11), Merida, Yucatan (Schott +); GuaTeMaLa, 
Escuintla, Savana Grande, Duefas !, Tactic, Coban, Choctum (0. 8. & &. D. G.); 
Honporas, Omoa (Leyland *), San Pedro (G. MZ. Whitely©); Nicaragua, Greytown 
(Holland 48); Costa Rica, San José (v. Frantzius’), Barranca (Carmiol®); Panama, 
Volcan de Chiriqui (Arcé *°),—Brrmupa®; ANTILLES °°. 
* Ridgway, Proc. U.S. Nat. Mus. 1880, p. 12. 
