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Rh to the Furnariidæ), but the latter has the primaries, primary coverts, and alula sooty blackish, and under parts of the body spotted rather than streaked.


 * Thamnoplulus, sp.?, Proc. Ac. Nat. Sci. Phila., 1860, 189 (Turbo, Colombia).
 * Thamnophihis virgatus, Proc. Ac. Nat. Sci. Phila., xx, 1868, 361 (Turbo, Colombia; coll. Acad. Nat. Sci. Phila.). — and , Biol. Centr.-Am., Aves, ii, 1892, 199 (Turbo).
 * [Thamnophilus] virgatus, Hand-list, iii, 1901, 12.

 Genus ERIONOTUS Cabanis and Heine.

Medium-sized or rather small Formicariidæ (length about 140-150 mm.), with bill more compressed than in Thamnophilus and coloration very different, the plumage without bars, either above or below.

Bill variable in size (nearly as long to only about half as long as head), its width at frontal antiæ not greater than its height at same point and equal to less than one-half to decidedly more than one- half the distance from nostril to tip of maxilla; culmen slightly to distinctly ridged, nearly straight for most of its length, strongly decurved terminally, the tip of maxilla distinctly (sometimes strongly) uncinate; maxillary tomium straight, slightly but distinctly notched subterminally; mandibular tomium straight, slightly but distinctly notched and toothed subterminally, the tip of the mandible forming a small but distinct recurved point; gonys moderately convex (more strongly so basally), recurved terminally. Nostril exposed (but posteriorly in contact with feathering of the latero-frontal antiæ), oval or roundish, without operculum, with the interior tubercle slightly visible in posterior portion. Rictal bristles present but minute (practically obsolete); feathers of chin, malar and frontal antiæ, and lores, with distinct terminal setæ. Wing moderate or rather large, with longest primaries decidedly longer than secondaries; fourth, fifth, and sixth, or fifth, sixth, and seventh primaries longest and equal (or the fifth slightly longer than fourth, the latter equal to sixth), the tenth (outermost) about three-fifths as long as the longest, the ninth equal to or shorter than secondaries. Tail four-fifths to more than five- sixths as long as wing, much rounded (graduation less than length of middle toe without claw), the rectrices (12) moderately broad or rather narrow, rounded terminally. Tarsus longer (sometimes much longer) than exposed culmen, one-third as long as wing or a little less, distiactly scutellate, the plantar scutella in two longitudinal 