74 TYEANNID^. 



stura, Grecia ^ (Carmiol), Navarro (Cooper ^) ; Panama, Vibala, Chiriqui, Calove- 

 vora 13 (Arce), 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. 



Empidonax bairdi, Scl. P. Z. S. 1858, p.301^ Cat. Birds Brit. Mus. xiv. p. 230'; Baird, Brew., & 

 Ridgw. N. Am. B. ii. p. 363'; Ridgw. Ibis, 1886, p. 466*; Man. N. Am. B. p. 341 \ 



Empidonax difficilis, Baird, B. N. Am. p. 198, t. 7G. f. 3'; 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. Best. See. N. H. ii. p. 287 '^ 



Supra olivaceus ; alis nigricantibus, tectricibus ochresoenti-flavia, secundariis eodera colore limbatia ; cauda 

 fusco-nigricante, ochraceo vix limbata ; oculorum ambitu pallide flavo : subtus pallide ochraceo-flayidus ; 

 pectore oebraceo-olivaeeo : rostri maxilla nigricante, mandibula flavida. Long, tota 5-0, alse 2-7, caudae 

 2-3, tarsi 0-7, rostri a riotu 0'6. (Descr. maris ex Presidio, Mexico. Mus. nostr.) 



Hab. NoETH America, Western United States from Sitka southwards ^. — Mexico, 

 Yecara in Sonora {Lloyd), Mazatlan, Tres Marias Is. ( Grayson i^, Forrer), Plains of 

 Colima {Xantus ^^), 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. I). G.), Cordova {Salle ^). 



According to Mr. Ridgway's key of the genus Empidonax the bird called E. bairdi 

 falls into the section which has the under wing-coverts yellow like those o^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. bairdi in this 

 respect agrees with E. 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 

 lochraceous than others, but we are unable to trace anything like definite distinction 



