758 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Costa Rica (Angostura; Rio Frio; Tucurrique; Juiz; Volcan de 

 Miravalles; La Palma; San Carlos), Nicaragua (Greytown; Los 

 Sabolos), and southern Honduras (Segovia River). 



Basileuterus uropygialis (not of Sclater) Lawrence, Ann. Lye. N. Y., viii, 1866, 

 180 (Greytown, Nicaragua) ; ix, 1868, 95 (Angostura and .Juiz, Costa Eica).— 

 Salvin, Ibis, 1872, 313 (Nicaragua).— Bougaed, Proc. Zool. Soc. Lond., 1878, 

 52 (San Carlos, Costa Rica). 



Basileuterus leucopygius Sclater and Salvin, Nom. Av. Neotr., 1873, 156 (Costa 

 Rica; coll. P. L. Sclater). — Salvin and Godman, Biol. Centr.-Am., Aves, i, 

 1881, 172, part (Greytown, Nicaragua; Tucurrique, Angostura, and Juiz, 

 Costa Rica).— Nutting, Proc. U. S. Nat. Mus., vi, 1884, 399 (Los Siibalos, 

 Nicaragua; habits). — Sharpe, Cat. Birds Brit. Mus., x, 1885, 402. — Zeledon, 

 Proc. U. S. Nat. Mus., viii, 1885, 105 (Costa Rica); Anal. Mus. Nac. Costa 

 Rica, i, 1887, 107 (Angostura and Juiz, Costa Rica). — Richmond, Proc. 

 U. S. Nat. Mus., xvi, 1893, 485 (Rio Frio, Costa Rica; habits; song).— 

 Underwood, Ibis, 1896, 434 (Volcan de Miravalles, Costa Rica). 



IBcmleutenis} leucopygius Sclater and Salvin, Nom. Av. Neotr., 1873, 10. 



Basileuterus semicervinus leucopygius Ridgway [and Nutting], Proc. U. S. Nat. 

 Mus., V, Sept. 5, 1882, 390 (La Palma, Costa Rica; habits). 



Genus ERGATICUS Baird. 



Ergaticus Baird, Review Am. Birds, Apr., 1865, 237, 264. (Type, Setophaga 

 rubra Swainson. ) 



Small "fly -catching" Mniotiltidse with the bill very small and nar- 

 row (narrower than deep at gonydeal angle and with maxilla from 

 nostril not longer than hallux, without claw) ; ninth primary shorter 

 than fourth; color mostly red. 



Bill very small (length of maxilla from nostril not more than length 

 of hallux without claw), narrow (width at gonydeal angle decidedly 

 less than depth at same point); culmen nearly straight for basal half 

 or more, then gently decurvcd; maxillary tomium nearly straight for 

 terminal half, the basal half gently deflexed to the rictus, the sub- 

 terminal notch indistinct; gonys straight or very faintly convex. 

 Nostril longitudinal, narrowly oval, elliptical, or nearly linear, over- 

 hung by broad membranous operculum. Rictal bristles well devel- 

 oped, more than half as long as bill. Wing rather long, rounded 

 (seventh, sixth, and fifth primaries longest, eighth longer than fourth, 

 ninth shorter than third) ; wing-tip longer than commissure, but much 

 shorter than tarsus. Tail nearly as long as wing, rounded, the rec- 

 trices rather narrow, with rounded tips. Tarsus a little less than one- 

 third as long as wing, slender, its scutella distinct or obvious only on 

 lower portion; middle toe, with claw, much shorter than tarsus; basal 

 phalanx of middle toe united for most of its length to outer toe, for 

 about half its length (or a little less) to inner toe. 



Coloration. — Prevailing color red (sexes alike). 



Nidification. — Unknown. 



^aMj?(?.— Highlands of Mexico and Guatemala. (Two species.) 



