BIRDS OF NOETH AND MIDDLE AMERICA. 465 



of base of qiiddle claw; hallux about as long as lateral toes but much 

 stouter, its claw shorter than the digit. 



Coloration. — Plain olive-green, except pileum and hindneck, which 

 are either partly rufous-chestnut, wholly uniform black, or marked 

 with two broad black lateral stripes and a median gray or olive- 

 yellowish stripe; sides of head black, with or without a gray or white 

 supra-auricular stripe; under parts white, the sides and flanks gray or 

 brown, the chest with or without a black collar. 



Range. — Southern Mexico to Peru, Bolivia, and Venezuela. 



KEY TO THE SPECIES OP BUAHRKMON. 



a. Pileum rufous-chestnut posteriorly; a black band across chest. (Southern Mexico 



to Peru.) - Buarremon brunneinuclius (p. 465) 



aa. Pileum without any chestnut, but marked with two broad lateral stripes of black 

 and a median stripe of gray or olive-yellowish; no black band across chest. 

 6. Median crown-stripe and superciliary stripe olive-yellowish. (Southern portion. 



of Mexican plateau. ) Bnarremon virenticeps (p. 467) 



hh. Median crown-stripe and superciliary stripe gray. (Costa Eica to Peru and 

 Venezuela. ) Buarremon assimilis (p. 468) 



BUARREMON BRUNNEINUCHUS (Lafresnaye). 

 OHESTUTTT-OAPPED BUARREMON. 



Adults {sexes alike). — Foi-ehead, loi-es, orbital i-egion, and auricular 

 region black, the first with a median and two lateral streaks of white; 

 rest of pileum chestnut or rusty chestnut, usually more or less ochra- 

 ceous along lateral margins; rest of upper parts plain olive-green, the 

 remiges and rectrices more dusky brownish; edge of wing light yellow; 

 malar region, chin, throat, and median portion of breast and abdomen 

 white; a black band across chest; sides slate-grayish anteriorly, passing 

 into olive-green on flanks; under tail-coverts light olive-greenish; bill 

 black; iris brown; legs and feet dark brown. 



Young. — Pileum dark brown, becoming lighter and more cinnamo- 

 meous laterally (above auricular region); loral, orbital, and auricular' 

 regions dusky; rest of upper parts olive-green, more or less stained or 

 tinged with deep brown; under parts sepia brown, the throat streaked 

 with yellowish white, the breast and abdomen streaked with pale 

 yellowish. 



Adult ma^e.— Length (skins), 177.80-209.55 (189.74); wing, 79.25- 

 96.01 (85.09); tail, 79.25-97.28 (87.63); exposed culmen, 14.48-18.03 

 (15.49); depth of bill at base, 7.37-8.38 (7.87); tarsus, 27.94r-31.75 (29.72); 

 middle toe, 18.54-22.10 (20.07).' 



Adult female.— IjQiigth (skins), 172.72-190.50 (181.36); wing, 73.15- 

 86.60 (78.74); tail, 71.63-87.63 (82.04); exposed culmen, 14.73-15.75 



^Thirteen specimens (nine from southern Mexico, four from Costa Eica). 

 17024—01 30 



