BIRDS OF NORTH AND MIDDLE AMERICA. 857 



Proc. U. S. Nat. Miis., xvi, 1891^ 50() (Rio Escondidw, Nicaragua). — 



Underwood, Ibis, 189G, 438 (Volcan de Miravalles, Costa Rica). — Bangs, 



Proc. Biol. Soc. Wash., xii, 1898, 137 (Santa Marta); Proc. New Engl. Zool. 



CI., ii, 1900, 22 (Lion Hill, Panama).— Allen, Bnll. Am. Mus. N. H., xiii, 



1900, 145 (Bonda, etc., Santa Marta, Colombia). 

 [Miiseirora] inexicana Gray, Hand-list, i, 1869, 358, no. 5444, part. — Sclatek and 



Salvin, Nom. Av. Neotr., 1873, 50, part. 

 Onychorhynchus mericanus Oberholser, Auk, xviii, April, 1901, 191, ]xvrt. — 



Bangs, Proc. New Engl. Zool. Clul), iii, 1902, 37 (Bogaba, Panama). 

 [Onychorhynchus] mcxirayina Sharpe, Hand-list, iii, 1901, 130, part. 

 Onychorhynchua mcxicannn vicxicamis Bangs, Proc. New Engl. Zool. Clul>, iii. 



Mar. 31, 1902, 87, part (Bogaba and Lonia del Leon, Panama). — TuAYEii 



and Bangs, Bull. Mus. Comp. Zool., xlvi, 190(i, 219 (Sabana de Panama). 

 Onychorhynchus mericanus fraterculiis Bangs, Pi'oc. New Engl. Zool. Club, iii. 



Mar. 31, 1902, 86 (Sanfa Marta, Col()nd)ia; coll. E. A. and O. Bangs). 



Genus ONCOSTOMA Sclater. 



Oncosloma Sclatek, Il)is, iv, Jan., 1862, 12; Cal. Am. i'.irds, .Tan. 24, 1862, 208. 

 (Type, Todiroslrum cinrreigulare Sclater.) 



V^eiy small TyrannidiTp (wing about 42-.").'^ mm.) with bill rather 

 strongly decurved, with conspicuously arched cidmen. 



Bill more than half as long as head, strongly decurved, with culmen 

 distinctly arched, its width at frontal antise less than twice its depth 

 at same point; exposed cidmen about as long as middle toe with claw, 

 strongly and uniforndy convex from base to tip, sharply ridged; 

 gonys straight or very fainth\ convex, about as long as mandibular 

 rami; maxillary tomium regularl}^ concave throughout, distinctly 

 notched subterminally. Nostril wholly exposed, longitudinally 

 elliptical, with broad membrane above and behind. Ilictal bristles 

 conspicuously develoj^ed, and feathers of frontal antia^ with very dis- 

 tinct long bristly points, those of chin with very indistinct seta-. 

 Wing moderate, excessively roimded; fifth and sixth primaries long- 

 est, seventh intermediate between fourth and fifth, eighth about equal 

 to second, ninth shorter than iirst, tenth (outermost) much shorter 

 than secondaries; longest primaries exceeding secondaries by not 

 more than distance from nostril to tij) of maxilla. Tail about foiu- 

 fifths as long as wing, strongly roimded, the rectrices rather narrow. 

 Tarsus less than one-third as long as wing, slender, the acrotarsium 

 fused, or with transverse divisions barely discernible; middle toe, 

 with claw, about equal to exposed culmen, without claw about half as 

 long as tarsus, its basal phalanx wholly united to outer toe, more than 

 half united to inner toe; outer toe, without claw, reaching nearly to 

 terminal joint of middle toe, the inner toe nuich shoi'ter, barely reach- 

 ing middle of subterminal j)halanx of middle toe; hallux about as long 

 as inner toe, not consjiicuously stouter, its claw shoi'ter than the digit; 

 all the claws moderately curved, very sharp and compressed. 



