74 . TYRANNID. 
stura, Grecia” (Carmiol), Navarro (Cooper®); Panama, Vibalé, Chiriqui, Calove- 
vora 13 (Arcé), Lion-Hill Station (M‘Leannan § °). 
E. flaviventris is the sole representative in Eastern North America of the yellow- 
bellied section of the genus, and it is the only one which has the wing-bands rather 
conspicuously of a yellowish white; those of the allied forms being more or less 
tinged with grey or buff. The under surface, too, is of a brighter paler yellow, and 
the under wing-coverts are pale yellow rather than buff. 
In our country it is most probably a migratory species, breeding in the Northern 
United States, and still further north, occurring even in Greenland, and passing in 
autumn and spring along the eastern flank of the mountains of Mexico, thence through 
Guatemala generally, and southwards as far as the State of Panama. So far as the 
evidence before us goes it is absent from Central and Western Mexico, but it appears 
on the shores of the Pacific at Tehuantepec. 
Its nest is placed in clefts of old stumps or logs or similar situations, and is bulky, 
being composed of mosses &c. The eggs are buffy white or pale buff, speckled, chiefly 
round the larger end, with rusty brown or cinnamon. 
7. Empidonax bairdi. 
Empidonazx bairdi, Scl. P. Z. 8S. 1858, p.3801*; Cat. Birds Brit. Mus. xiv. p. 230°; Baird, Brew., & 
Ridgw. N. Am. B. 11. p. 863°; Ridgw. Ibis, 1886, p. 466*; Man. N. Am. B. p. 341°. 
Empidonax dificilis, Baird, B. N. Am. p. 198, t. 76. f. 2°; Ridgw. Ibis, 1886, p. 466"; Man. N. 
Am. B. p. 340°; Scl. Cat. Birds Brit. Mus. xiv. p. 229°. 
Empidonax flaviventris, var. difficilis, Baird, Brew., & Ridgw. N. Am. B. ii. p. 380"°; Henshaw, 
U.S. Geogr. Surv. West of 100th Mer. v. p. 359 *'; Lawr. Mem. Bost. Soc. N. H. ii. p. 2877. 
Supra olivaceus; alis nigricantibus, tectricibus ochrescenti-flavis, secundariis eodem colore limbatis; cauda 
fusco-nigricante, ochraceo vix limbata; oculorum ambitu pallide flavo: subtus pallide ochraceo-flavidus ; 
pectore ochraceo-olivaceo: rostri maxilla nigricante, mandibula flavida. Long. tota 5-0, ale 2-7, caudee 
2°3, tarsi 0°7, rostri a rictu 0-6. (Descr. maris ex Presidio, Mexico. Mus. nostr.) 
Hab. Norra America, Western United States from Sitka southwards §.—MeExico, 
Yecara in Sonora (Lloyd), Mazatlan, 'Tres Marias Is. (Grayson 1°, Forrer), Plains of 
Colima (Xantus1*), Amula, Omilteme, Venta del Peregrino, Venta de Camaron, 
Tepetlapa, and Dos Arroyos in Guerrero (Mrs. H. H. Smith), Sierra de San Luis 
Potosi (Richardson), Coapa, Chimalpa, Cuajimalpa (Ferrari-Perez), Amecameca, 
El Pinal near Puebla, Jalapa (f. D. G.), Cordova (Sallé 1). 
According to Mr. Ridgway’s key of the genus Hmpidonax the bird called #. bairdi 
falls into the section which has the under wing-coverts yellow like those of E. flavi- 
ventris; but from the specimens before us, from Mr. Sclater’s collection, supplemented 
by others recently received from various parts of Mexico, we find that E. batrdi in this 
respect agrees with /. difficilis, and in fact is, in our opinion, undistinguishable from 
that species. It is true some specimens have the tips of the wing-coverts rather more 
ochraceous than others, but we are unable to trace anything like definite distinction 
