BIRDS OF NORTH AND MIDDLE AMERICA. 177 



habits). — Taczanowski, Proc. Zool. Soc. Lond., 1874, 529 (Ropaybamba 

 and Anquimarca, centr. Peru); 1879, 231 (Tambillo and Guajango, Peru); 

 1882, 26 (Chirimoto, Cococho, and Iluambo, Peru); Orn. du Perou, ii, 1884, 

 IGO. — Berlepscii and Taczanowski, Proc. Zool. Soc. Lond., 1883, 562 

 (Guayaquil, w. Ecuador; crit.). — Berlepsch, Jom-n. fiir Orn., 1884, 318 

 (Cauta, Colombia). — Taczanowski and Berlepsch, Proc. Zool. Soc. Lond., 

 1885, 97 (Macliay, Ecuador; crit.).— Sclater, Cat. Birds Brit. Mus., xv, 1890, 

 111, part (Costa Rica; Volcan do Chiriqui, Panama; Medellin, Santa Elena, 

 and Bogota, Colombia; Balzar Mountains and Sarayacu, Ecuador; Nautaand 

 Tambillo, Peru). — Salvin and Godman, Biol. Centr. -Am., Aves, ii, 1891, 

 165, part (Volcan de Chiriqui; Colombia). — Allen, Bull. Am. Mus. N. H., 

 xiii, 1900, 159 (Las Nubes, Santa Marta, Colombia). — Goodfellow, Ibis, 

 1902, 61 (Baeza, e. Ecuador).— Ferry, Pub. 146, Field Mus. N. H., orn. ser. 

 i, no. 6, 1910, 270 (Guayabo, Costa Rica). 



[Xenops] rutilus Sclater and Salvin, Nom. Av. Neotr., 1873, 66, part. — Sharpe, 

 Hand-list, iii, 1901, 71, part (Costa Rica; Panama; Colombia; Peru). 



X[enops] heterurus Cabanis and Heine, Mus. Hein., ii, Aug., 1859, 33 (Colombia; 

 coll. Heine Mus.). 



Xenops heterurus Sclater, Cat. Am. Birds, 1862, 159 (Bogota). — Sclater and 

 Salvin, Proc. Zool. Soc. Lond., 1866, 566 (Rio L^cayali, e. Peru). — Salvin, 

 Ibis, 1869, 319 (Costa Rica); Proc. Zool. Soc. Lond., 1870, 192 (Volcan de 

 Chiriqui; crit.). — Salvadori and Festa, Boll. Mus. Zool., etc., Torino, xv, 

 1899, no. 362, 23 (Vinces, w. Ecuador; crit.; synonymy). 



[Xenops] heterurus Sharpe, Hand-list, iii, 1901, 71 (Ecuad6r; Peru). 



Xenops rutilus heterurus Berlepsch and Stolzmann, Proc. Zool. Soc. Lond., 1896, 

 375 (La Gloria, Borgona, and Garita del Sol, centr. Peru); Ornis, 1906, 92 

 (Idma, Santa Ana, Peru).— Berlepsch, Novit. Zool., xv, 1908, 147 (Cayenne; 

 crit.). 



Genus MARGARORNIS Reichenbach. 



Margarornis Reichenbach, Handb. Spec. Orn., 1853, 119. (Type, Anabates 



squamigera Lafresnaye and D'Orbigny.) 

 Anahasitta Lafresnaye, Rev. et Mag. de Zool., Nov., 1853, 492. (Type, Anabates 



squamigera Lafresnaye and D'Orbigny.) 



Small scansorial Furnariida^i (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 hmdneck) uniform 

 bright cinnamon-rufous . 



Bill very much shorter than head, rather slender, moderately com- 

 pressed, its width at loral antiie 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) ter- 

 minally, without trace of notch; gonys nearly straight, scarcely if 

 at all ascending terminally, not prominent basally. Nostril exposed, 

 posteriorly in contact with loral feathermg, narrow, longitudinal, 

 81255°— Bull. 50—11 12 



