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 Huambo, Peru); Orn. du Pérou, ii, 1884, 
160.—BrriepscH and TaczanowskI, Proc. Zool. Soc. Lond., 1883, 562 
(Guayaquil, w. Ecuadér; crit.)—Brrizrscn, Journ. fiir Orn., 1884, 318 
(Cauta, Colombia).—TaczanowskI and BEererscu, Proc. Zool. Soc. Lond., 
1885, 97 (Mach4y, Ecuadér; crit.).—SciatEr, Cat. Birds Brit. Mus., xv, 1890, 
111, part (Costa Rica; Volcan de Chiriqui, Panam4; Medellin, Santa Elena, 
and Bogoté, Colombia; Balzér Mountains and Sarayacu, Ecuadér; Nauta and 
Tambillo, Peru).—Satvin and Gopman, Biol. Centr.-Am., Aves, ii, 1891, 
165, part (Volcan de Chiriqui; Colombia).—AtLen, Bull. Am. Mus. N. H., 
xiii, 1900, 159 (Las Nubes, Santa Marta, Colombia).—Goopre.tow, Ibis, 
1902, 61 (Baeza, e. Ecuadér).—FeErry, Pub. 146, Field Mus. N. H., orn. ser. 
i, no. 6, 1910, 270 (Guayabo, Costa Rica). 
[Xenops] rutilus Sctater and Satvin, Nom. Av. Neotr., 1873, 66, part—SHarre, 
Hand-list, iii, 1901, 71, part (Costa Rica; Panam4; Colombia; Peru). 
X[enops] heterurus CaBanis and Herne, Mus. Hein., ii, Aug., 1859, 33 (Colombia; 
coll. Heine Mus.). 
Xenops heterurus ScuateR, Cat. Am. Birds, 1862, 159 (Bogoté).—Sctarer and 
Satvin, Proc. Zool. Soc. Lond., 1866, 566 (Rio Ucayali, e. Peru).—Satvin, 
Ibis, 1869, 319 (Costa Rica); Proc. Zool. Soc. Lond., 1870, 192 (Volcan de 
Chiriquf; crit.) —Satvapori and Festa, Boll. Mus. Zool., etc., Torino, xv, 
1899, no. 362, 23 (Vinces, w. Ecuadér; crit.; synonymy). 
[Xenops] heterurus SHarpPe, Hand-list, iii, 1901, 71 (Ecuadér; Peru). 
Xenops rutilus heterurus BERLEPscH and StotzManNn, Proc. Zool. Soc. Lond., 1896, 
375 (La Gloria, Borgofia, and Garita del Sol, centr. Peru); Ornis, 1906, 92 
(Idma, Santa Ana, Peru).—Beruepscu, Novit. Zool., xv, 1908, 147 (Cayenne; 
crit.). 
Genus MARGARORNIS Reichenbach. 
Margarornis ReicuenBacn, Handb. Spec. Orn., 1853, 119. (Type, Anabates 
squamigera Lafresnaye and D’Orbigny.) 
Anabasitta LAFRESNAYE, Rev. et Mag. de Zool., Nov., 1858, 492. (Type, Anabates 
squamigera Lafresnaye and D’Orbigny.) 
Small scansorial Furnariide (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 com- 
pressed, its width at loral antie 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 feathering, narrow, longitudinal, 
81255°—Bull. 50—11——12 
