272 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
Venezuela (San Esteban; Caracas; Cumanacoa, Bermudez), 
Colombia (Bogoté; Remédios, Antioquia), and eastern Panama 
(Lion Hill and Frijole stations; Panama). 
Xiphorhynchus lafresnayanus (not Dendrocolaptes lafresnayanus D’Orbigny) Law- 
RENCE, Ann. Lyc. N. Y., vii, 1862, 292 (Lion Hill, Panama). 
Xiphorhynchus trochilirostris (not Dendrocolaptes trochilirostris Lichtenstein) 
Sctater and Satvin, Proc. Zool. Soc. Lond., 1879, 524 (Remédios, Antio- 
quia, Colombia; descr. nest and eggs).—Sciarer, Cat. Birds Brit. Mus., xv, 
1890, 159, part (Lion Hill, Panam4; Remédios and Bogoté, Colombia; San 
Esteban and Cardcas, Venezuela).—Satvin and Gopman, Biol. Centr.-Am., 
Aves, ii, 1891, 188, excl. syn. part (Lion Hill; Colombia; Venezuela).— 
Banas, Proc. New Engl. Zool. Club, ii, 1900, 26 (Loma del Leén, Panamé4). 
[Xiphorhynchus] trochilirostris ScLaTER and Savin, Nom. Av. Neotr., 1873, 69, 
part.—Suarpe, Hand-list, iii, 1901, 86, part. 
Xiphorhynchus venezuelensis CHAPMAN, Bull. Am. Mus. N. H., ii, no. 3, July, 1889, 
156 (Venezuela?; type in coll. Bost. Soc. N. H.; ex Lafresnaye, MS., Gray, 
Hand-list, i, 1869, 178, no. 2423, and Giebel, Thes. Orn., 1877, 766=nomen 
nudum). 
Xiphornis venezuelensis OBERHOLSER, Smithsonian Misc. Coll., xlviii, no. 1579, 
May 13, 1905, 64. 
Xiphorhynchus isabella “Verr.,’”? Gray, Hand-list, i, 1869, 178, no. 2429 (nomen 
nudum; ex Verreaux, MS.; =isabelline or semi-albinistic variety; see Chap- 
man, Bull. Am. Mus. N. H., ii, no. 3, 1889, 157). 
CAMPYLORHAMPHUS BOREALIS (Carriker). 
COSTA RICAN SICKLE BILL. 
Similar to (. venezuelensis, but coloration much darker, under parts 
much more olivaceous with streaks much narrower, and bill horn 
color instead of light reddish brown. 
Adults (sexes alike).—Pileum dark sooty brown to sooty black, each 
feather with a narrow (usually guttate) streak of buff, the hindneck 
similar but with the ground color slightly less dark; back and 
scapulars deep brown (between raw-umber and mummy brown), with 
very narrow mesial streaks or shaft-streaks of light buff, at least on 
upper back; rump cinnamon-rufous, passing into rufous-chestnut on 
upper tail-coverts, the tail and remiges deep chestnut; wing-coverts 
similar in color to remiges but duller (tinged with color of back); 
sides of head and neck streaked with sooty brown or blackish and 
buff, the markings on malar region broader, more spot-like; chin and 
throat deep buff, the feathers of the latter edged (sometimes termi- 
nally margined also) with sooty brown or blackish, the streaks thus 
produced increasing in width posteriorly; rest of under parts deep 
raw-umber brown, slightly paler (sometimes slightly rufescent) 
posteriorly, the foreneck, chest, and breast with narrow mesial 
streaks of buff, the under tail-coverts (sometimes abdomen also) with 
much narrower and more indistinct streaks; under wing-coverts 
ochraceous or tawny-ochraceous, the inner webs of remiges light 
cinnamon-rufous, passing into dull grayish brown terminally (exten- 
