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Rh habits). —, Proc. Zool. Soc. Lond., 1874, 529 (Ropaybamba and Anqiiimarca, centr. Peru); 1879, 231 (Tambillo and Guajango, Peru); 1882, 26 (Chirimoto, Cococho, and Iluambo, Peru); Orn. du Pérou, ii, 1884, 160. — and, Proc. Zool. Soc. Lond., 1883, 562 (Guayaquíl, w. Ecuadór; crit.). — , Journ. für. Orn., 1884, 318 (Cauta, Colombia). —  and , Proc. Zool. Soc. Lond., 1885, 97 (Macháy, Ecuadór; crit.). — , Cat. Birds Brit. Mus., xv, 1890, 111, part (Costa Rica; Volcan de Chiriquí, Panamá; Medellín, Santa Elena, and Bogotá, Colombia; Balzár Mountains and Sarayacu, Ecuadór; Nauta and Tambillo, Peru). —  and , Biol. Centr. -Am., Aves, ii, 1891, 165, part (Volcan de Chiriquí; Colombia). — , Bull. Am. Mus. N. H., xiii, 1900, 159 (Las Nubes, Santa Marta, Colombia). — , Ibis, 1902, 61 (Baeza, e. Ecuadór). — , Pub. 146, Field Mus. N. H., orn. ser. i, no. 6, 1910, 270 (Guayabo, Costa Rica).
 * [Xenops] rutilus and, Nom. Av. Neotr., 1873, 66, part. — , Hand-list, iii, 1901, 71, part (Costa Rica; Panamá; Colombia; Peru).
 * X[enops] heterurus and, Mus. Hein., ii, Aug., 1859, 33 (Colombia; coll. Heine Mus.).
 * Xenops hetenirus, Cat. Am. Birds, 1862, 159 (Bogotá). — and , Proc. Zool. Soc. Lond., 1866, 566 (Rio Ucayali, e. Peru). — , Ibis, 1869, 319 (Costa Rica); Proc. Zool. Soc. Lond., 1870, 192 (Volcan de Chiriquí; crit.). —  and , Boll. Mus. Zool., etc., Torino, xv, 1899, no. 362, 23 (Vinces, w. Ecuadór; crit.; synonymy).
 * [Xenops] heterurus, Hand-list, iii, 1901, 71 (Ecuadór; Peru).
 * Xenops rutilus heterurus and, Proc. Zool. Soc. Lond., 1896, 375 (La Gloria, Borgoña, and Garita del Sol, centr. Peru); Ornis, 1906, 92 (Idma, Santa Ana, Peru). — , Novit. Zool., xv, 1908, 147 (Cayenne; crit.).

 Genus MARGARORNIS Reiehenbach.


 * Margarornis, Handb. Spec. Orn., 1853, 119. (Type, Anabates squamigera Lafresnaye and D'Orbigny.)
 * Anabasitta, Rev. et Mag. de Zool., Nov., 1853, 492. (Type, Anabates squamigera Lafresnaye and D'Orbigny.)

Small scansorial Furnariidæ (length about 130-150 mm.) with small bill (much shorter than head), long spine-tipped tail, very long hallux, middle toe united to outer toe by whole of its first phalanx (sometimes a small part of its second phalanx also), and color of upper parts (except, sometimes, pileum and hindneck) uniform bright cinnamon-rufous.

Bill very much shorter than head, rather slender, moderately compressed, its width at loral antidæ about equal to its depth at same point and equal to about half the distance from nostril to tip of maxilla; culmen rather sharply ridged, gradually but decidedly decurved from base; maxillary tomium nearly straight or slightly decurved (concave) terminally, without trace of subterminal notch; mandibular tomium slightly but decidedly decurved (convex) terminally, without trace of notch; gonys nearly straight, scarcely if at all ascending terminally, not prominent basally. Nostril exposed, posteriorly in contact with loral feathering, narrow, longitudinal, 81255° — Bull. 50—11——12