[91] Empidonax flavescens, Lawr. May be the southern form of bairdi, but differ in some apparently essential features.
[92] Empidonax bairdi, Sclater, P. Z. S. 1858, 301; Ibis, 1859, 442; Catal. Am. B. 1862, 230.—Sclater & Salvin, Ibis, 1860, 36. (Hab. Cordova, Coban, Mazatlan, Mirador, etc.)
[93] Empidonax fulvipectus, Lawr. Ann. N. Y. Lyc. Feb. 1871, 11. (Type examined.) A very distinct species, most nearly related to obscurus, from which it differs totally in color and in much shorter tarsus.
[94] Empidonax minimus, var. pectoralis. Empidonax pectoralis, Lawr. It seems but reasonable to consider this bird as the southern race of minimus, as the differences—i. e. smaller size and whiter wing-bands—are just what we find in several other species of the same region, compared with allied and probably co-specific northern types,—as griseigularis and acadicus, southern specimens of trailli var. pusillus in which the wing-bands are much whiter than in northern specimens of the same bird.
[95] Empidonax griseipectus, Lawr. May possibly be another seasonal plumage of the same species as pectoralis, but differs in some seemingly important respects.
[96] Empidonax acadicus, var. griseigularis. Empidonax griseigularis, Lawr. Differing from acadicus only in smaller size and whiter wing-bands.
The remaining described American species of Empidonax, which we have not seen, are the following:—
Empidonax magnirostris, Gould, Voy. Beagle, pl. 8.—Gray, Hand List.
Empidonax albigularis, Sclater & Salvin, Ibis, 1859, p. 122 (Orizaba).—Sclater, Catal. Am. B. 1862, 229. This may possibly be the species described above as E. axillaris.
[97] Mitrephorus fulvifrons. Muscicapa fulvifrons, Giraud, 16 species Texas birds, 1841, pl. ii (Mexico?). Empidonax fulvifrons, Sclater, P. Z. S. 1858, 301. Mitrephorus fulvifrons, Sclater, P. Z. S. 1859, 45. Empidonax rubicundus, Cabanis, Mus. Hein. ii, 1859, 70 (Mexico). Hab. Northern Mexico.