70 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Bill small and short (about as long as distance from nostril to mid- 

 dle of eye), its depth at frontal antise (where depth and width about 

 equal) more than half the distance from nostril to tip of maxilla; 

 exposed culmen about ecjual in length to inner toe without claw, 

 straight basally, then gradually decurved to tip ; gonys faintly convex, 

 ascendmg terminally, nearly as long as distance from nostril to tip of 

 maxilla, much longer than mandibular rami ; maxillary tomium faintly 

 concave, distinctly notched subterminally. Nostril very narrow, lon- 

 gitudinally comma-shaped, broadest anteriorly, overhung by a broad, 

 convex, membraneous operculum, its posterior end hidden by the harsh 

 and semi-erect feathering of frontal antiae. Rictal bristles well devel- 

 oped, especially those nearest nostril. Wing short, very concave 

 beneath, much rounded at tip; outermost (tenth) primary minute 

 (shorter than primary coverts), the ninth two-thirds as long as 

 eighth, or longer, about one-fourth as wide as long; eighth primary 

 shorter than first (about ec^ual to secondaries) ; seventh about equal 

 to third; the sixth, fifth, and fourth longest. Tail very short, but 

 little more than half as long as wing, not longer than combined 

 length of tarsus and ba^al phalanx of middle toe, slightly rounded, 

 the rectrices not more than ten,*^ pointed at tip, their webs lax or semi- 

 decomposed. Tarsus very long and slender^ nearly half as long as 

 wing, at least four-fifths as long as tail, the acrotarsium fused on both 

 sides; middle toe (without claw) three-fifths as long as tarsus, or 

 slightly less; lateral toes slightly unequal, the inner (without claw) 

 reaching to subterminal articulation of middle toe, the outer slightlv 

 beyond; hallux ecjual to inner toe, or very slightly longer, much 

 stouter; basal phalanx of middle toe adherent for half its length, or 

 very slightly more, to outer toe, for less than half to inner toe ; claws 

 normal, that of hallux shorter than its digit. 



Coloration. — Pileum orange-rufous, the remainmg upper parts plam 

 olive or olive-green; under parts plain slate color or slate-gray, becom- 

 ing olive or olive-green on flanks and under tail-coverts. Sexes alike. 



Nidifi cation. — (Unknown. ) 



Range. — Sunmiits of high volcanoes of Costa Rica and Panama. 

 (Monotypic.) 



The relationships of this remarkable genus are somewhat doubtfid, 

 but I feel confident it is not far removed from (kitliarus, of which 

 (except in the character of the nostril, which is very difierent) it seems 

 to be an exaggeration. It is certainly an Oscine and not a Tracheo- 

 phone, as at first supposed. ^ 



o Of the two specimens examined one (the type of Z. coronata) has ten rectrices, the 

 other only eight, but possibly the tail may be imperfect in the latter. 



b The syrinx and wing-muscles has been studied by Mr. W. P. Pycraft, who found 

 them typically Oscinine. (See Bull. Brit. Orn. Club, xi, no. Ixxiv, 1900, 12.) 



[Since the above was written another article, by Mr. Pycraft, entitled "On the 

 Systematic Position of Zeledonia coronata, with some Observations on the Position of 

 the Turdidse," has appeared in Ibis, Jan., 1905, 1-24, pis. 1, 2.] 



