270 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
ee. Remiges and rectrices chestnut; under parts deeper, more olive, brown. 
(Venezuela to eastern Panam4.) 
Campylorhamphus venezuelensis (p. 271). 
dd. Streaks on pileum, hindneck, and chest much narrower. 
e. Pileum, hindneck, back, and under parts more cinnamomeous or russet 
brown; throat mostly unstreaked; streaks on pileum, chest, etc., more 
distinct. (Eastern Brazil.) 
Campylorhamphus procurvus? (extralimital),¢ 
ee. Pileum, hindneck, back, and under parts darker and more olive-brown; 
throat mostly streaked; streaks on pileum, chest, etc., less distinct. 
(Guianas.).......-...- Campylorhamphus procurvoides (extralimital).b 
aa. Bill horn brown or dusky. 
b. Throat buff, streaked with dusky brown; pileum sooty (more or less dark) streaked 
with brownish buff; rump rufescent, like upper tail-coverts; bill paler horn 
brown. 
c. Coloration darker, the pileum blackish brown, remiges and rectrices dark 
chestnut; streaks on pileum, hindneck, and under parts narrower. 
d. Paler, with under parts less olivaceous and less extensively streaked, the 
back unstreaked. (Central Colombia.) 
Campylorhamphus pusillus (extralimital).¢ 
dd. Darker, with under parts more olivaceous and more extensively streaked, 
and back narrowly streaked. (Western Panamé4; Costa Rica.) 
Campylorhamphus borealis (p. 272). 
cc. Coloration lighter, the pileum sepia brown, remiges and rectrices clear chest- 
nut; streaks on pileum, hindneck, and under partssbroader. (Range 
WHKTOWD: net nieaeercecnens Campylorhamphus chapmani (extralimital).¢@ 
bb. Throat immaculate dull white; pileum and hindneck black, streaked with 
brownish white or pale brownish buff;.rump olive-brown, like back; bill 
darker brown. (Brazil.)....- Campylorhamphus falcularius (extralimital).¢ 
Norsz.—Until a much greater amount of material than has been available in the 
preparation of this key can be examined, it would be quite useless to more than 
guess at which of the above-defined forms are specifically and which only subspecif- 
ically distinct. 
@(?) Dendrocolaptes procurvus Temminck, Pl. Col., iv, livr. 5, Aug., 1820, text to pl. 
28 (Brazil). 
All specimens of this form that I have seen are from Bahia. 
b Xiphorhynchus procurvoides Lafresnaye, Rev. et Mag. de Zool., 1850, 376 (Cayenne); 
Chapman, Bull. Am. Mus, N. H., ii, 1889, 158 (monogr.).—Xiphorhynchus trochili- 
rostris (not Dendrocolaptes trochilirostris Lafresnaye) Sclater, Cat. Birds Brit. Mus., 
xv, 1890, 159, part.—Xtphorhynchus subprocurvus Reichenbach, Handb. Spec. Orn., 
1853, 183.—Xiphornis subprocurvus Oberholser, Smithson. Misc. Coll., xlviii, no. 
1579, May 13, 1905, 64. 
¢ Xiphorhynchus pusillus Sclater, Proc. Zool. Soc. Lond., 1860, 278 (Colombia; coll. 
P. L. Sclater); Cat. Birds Brit. Mus., xv, 1890, 160, part (Bogot&é and Concordia, 
Colombia; Ecuadér?); Hartert, Novit. Zool., ix, 1902, 616 (Ventana, n. w. Ecuad6r; 
crit.). 
@Campylorhamphus chapmani Ridgway, Proc. Biol. Soc. Wash., xxii, April 17, 
1909, 74 (‘‘unknown locality in South America;” coll. Am. Mus. Nat. Hist.). 
€ Dendrocopus falcularius Vieillot, Tabl. Enc. Méth., 1822, 626 (Brazil).—X[ipho- 
rhynchus] falcularius Gray, Gen. Birds, i, Feb., 1847, 140.—Xtphorhynchus falcularius 
Chapman, Bull. Am. Mus. N. H., ii, 1889, 161 (monogr.); Menegaux and Hellmayr, 
Mém. Soc. Hist. Nat. d’Autun, xix, 1906, 115 (crit.; synonymy).—Xiphornis falcula- 
rius Oberholser, Smithson. Misc. Coll., xlviii, no. 1579, May 18, 1905, 64. 
