792 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Southern Mexico, in States of Vera Cruz (Pasa Nueva; Buena 

 Vista; Santa Lucrecia), Tabasco (Teapa), and Chiapas (Palenque) ; 

 highlands of Guatemahx (Choctum, Vera Paz) ; Nicaragua (San Juan ; 

 Greytown; Rio Escondido) ; Costa Rica (Pozo Azul). 



Tyrannulus semifiavus Sclater and Salvin, Proc. Zool. Soc. Lond., 1860, 300 

 (Choctum, Vera Paz, Guatemala; coll. Salvin and Godman); Ibis, 18G0, 400 

 (Choctum).— Sclater, Cat. Am. Birds, 1862, 215 (Vera Paz); Cat. Birds Brit. 

 Mus., xiv, 1888, 129.— Lawrence, Ann. Lye. N. Y., viii, 1867, 182 (Grey- 

 town, Nicaragua). — Salvin, Ibis, 1872, 313 (Nicaragua). — Salvin and God- 

 man, Biol. Centr.-Am., Aves, ii, 1888, 32, pi. 36, fig. 1 (Teapa, Tabasco, s. 

 Mexico, etc.). — Richmond, Proc. U. S. Nat. Mus., xvi, 1893, 505 (Rio Escon- 

 dido, Nicaragua). 



[Tyrannulus] sevdjlavus Sclater and Salvin, Nom. Av. Neotr., 1873, 48. — Sharpe, 

 Hand-list, iiii 1901, 12;. 



[Elainin] semiflava (not Elainea semiflava Lawrence, 1865) Gray, Hand-list, i, 

 1869, 356, no. 5409. 



Microtriccus semijlavus Ridgway, Proc. Biol. Soc. Wash., xviii, Sept. 2, 1905, 210. 



Ornithion snniflavum. Berlepsch, Proc. Fourth Internat. Orn. Cong., Feb., 

 1907,492. 



MICROTRICCUS BRUNNEICAPILLUS (Lawrence). 

 BROWN-CAPPED TYRANNULET. 



Similar to M. semijlavus, but pileum sooty brown instead of slate 

 color, white superciliary stripe shorter (extending scarcely beyond 

 middle of auricula'r region) and auricular region lighter olive-greenish. 



Adults (sexes alike). — Pileum uniform sooty brown (between sepia 

 and clove brown) ; rest of upper parts plain olive-green, the rectrices, 

 remiges, and greater wing-coverts dusky grayish brown edged with 

 olive-green (very narrowly on primaries) ; a narrow superciliary 

 stripe of white, extending to a little beyond eye or to about middle 

 of auricular region; lores dusky grayish; auricidar region and sides 

 of neck olive-green or greenish olive, the former slightly but indis- 

 tinctly darker along upper margin and next to posterior angle of 

 eye; under parts canary yellow, tinged laterally with olive-green, 

 the chest also tinged or obsoletely streaked with the same; axillars 

 and under wing-coverts paler (sulphur or primrose) yellow; inner 

 webs of remiges edged with dull yellowish white; bill brownish black 

 or blackish horn color, the mandible more grayish basally; legs and 

 feet dusky grayish in dried skins (bluish gray in life?). 



Young. — Similar to adults, but pileum lighter brown (deep hair 

 brown), back, etc., lighter and duller olive-green, and yellow of under 

 parts paler (nearly primrose). 



Adult male. — Length (skins), 77.5; wing, 44-44.5 (44.3); tail, 25.5- 

 26.5 (26); exposed culmen, 8-9 (8.5); tarsus, 12.5-13.5 (13); middle 

 toe, 7.5-8 (7.8).« 



o Two specimens. 



