272 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Venezuela (San Esteban; Caracas; Cunianacoa, Bermudez), 

 Colombia (Bogota; Remedios, Antioqiiia), and eastern Panama 

 (Lion Hill and Frijole stations; Panama). 



Xiphorhynchns lafresnayanus (not Dendrocolaptes lafresnayaniis D'Orbigny) Law- 

 rence, Ann. Lye. N. Y., vii, 18G2, 292 (Lion Hill, Panamd). 



Xiphorhynchus irochilirostris (not Dendrocolaptes trochilirostris Lichtenstein) 

 ScLATER and Salvin, Proc. ZooL Soc. Lond., 1879, 524 (Remedios, Antio- 

 quia, Colombia; descr. nest and eggs). — Sclater, Cat. Birds Brit. Mus., xv, 

 1890, 159, part (Lion Hill, Panamd; Remedios and Bogotd, Colombia; San 

 Esteban and Caracas, Venezuela). — Salvin and Godman, Biol. Centr.-Am., 

 Aves, ii, 1891, 188, excl. syn. part (Lion Hill; Colombia; Venezuela). — 

 Bangs, Proc. New Engl. Zool. Club, ii, 1900, 26 (Loma del Le6n, Panama). 



[Xiphorhynchus] trochilirostris Sclater and Salvin, Nom. Av. Neotr., 1873, 69, 

 part.— Sharps, Hand-list, iii, 1901, 86, part. 



Xij)horhynchus venczuelensis 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 venczuelensis 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.; =i8abelline 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 O. 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 s|)ot-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- 



