790 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Pacific slope of Costa Rica (Pirris; Pozo Aziil de Pirris; Pigres) 

 and western Panama ( Pedregal) . 



Carpodectes antonise ' 'Zeledon, MS." Ridgway, Ibis, 5th ser., ii, Jan., 1884, 27, 28, 

 pi. 2 (Pirris, s. w. Costa Rica; coll. U. S. Nat. Mus.); Proc. U. S. Nat. Mus., vi, 

 1883, 410; x, 1887, 20 (descr. adult female); Condor, vii, 1905, 155, in text 

 (Pigres, s. w. Costa Rica). — Sclater, Cat. Birds Brit. Mus., xiv, 1888, 389. — 

 Salvin and Godman, Biol. Centr.-Am., Aves, ii, 1891, 141. — Bangs, Proc. 

 New Engl. Zool. Club, iii, 1902, 41 (Pedregal, Chiriqui, Panama). 



[Carpodectes] antonise Sharpe, Hand-list, iii, 1901, 175. 



Genus MICROTRICCUS Ridgway. 



Microtriccus a Ridgway, Proc. Biol. Soc. Wash., xviii, Sept. 2, 1905, 210. (Type, 

 Tyrannulus semiflavns Sclater. ) 



Very small Cotingidae (wing less than 50 mm.) with tail much 

 less than one-third (but little more than one-half) as long as wing, 

 tarsal envelope essentially pycnaspidean, bill very small and stout 

 (less than half as long as head), its depth at frontal antise equal to its 

 width at same point. 



Bill small and stout, as deep as broad at frontal anti^, less than 

 half as long as head ; exposed culmen shorter than middle toe without 

 claw, sharply ridged, strongly curved almost from base, the tip of 

 maxilla very minutely uncinate; gonys longer than mandibular rami, 

 nearly straight, ascending terminally, its base somewhat prominent; 

 maxillary tomium very faintly sinuated, minutely notched subter- 

 minally. Nostril exposed, very small, circular, or broadly oval, near 

 center of nasal fossae, entirely surrounded by membrane. Rictal 

 bristles obvious on close examination, but very small; feathers of 

 chin and frontal antite wit]j small bristly tips. Wing moderate, 

 rather pointed, the longest primaries exceeding secondaries by about 

 length of exposed culmen; seventh, eighth, and ninth primaries 

 longest and about equal, the tenth (outermost) equal to or slightly 

 longer than fifth. Tail between one-half and two-thirds as long as 

 wing, slightly double-rounded or emarginate (the lateral rectrices 

 decidedly longer than middle pair), the rectrices rather broad, with 

 rounded tip. Tarsus less than one-third as long as wing, rather 

 stout, its scutellation essentially pycnaspidean, the acrotarsium extend- 

 ing only about halfway across outer side of tarsus, the planta tarsi 

 for the most part nonscutellate, but on its lower portion showing nu- 

 merous small but indistinct scutella; middle toe, without claw, be- 

 tween one-half and two-thirds as long as tarsus, its basal phalanx 

 entirel}^ united to outer toe, almost wholly united to inner toe; outer 

 toe, without claw, reaching to or slightly beyond middle of subter- 

 minal phalanx of middle toe, the inner toe slightly but decidedly 

 shorter; hallux about as long as inner toe, much stouter, its claw 



cMiKpoi, small; rpiKKoi, a small bird. 



