742 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



/. Auricular region with only the upper half chestnut, the lower half 

 whitish. 

 g. Hindneck and sides of neck gray; posterior under parts sometimes 

 partly whitish. (Southern Vera Cruz to Guatemala.) 



Basilexiterus rufifrons flavigaster, adults (p. 748) 

 gg. Hindneck and sides of neck olive-green, like back; under parts 

 without any whitish. (Highlands of Guatemala. ) 



Basilenterus rnfifrons salvini, adults (p. 749) 

 ff. Auricular region entirely chestnut. 



g. Darker; sides and flanks more strongly tinged with olive-green. 

 (Nicaragua and Costa Rica.) 



Basilenterus rufifrons delattrii, adults (p. 749) 

 gg. Lighter; sides and flanks less strongly tinged with olive-green. 

 (Colombia, north to Chiriqui. ) 



Basilenterus rnfifrons mesochrysns, adults (p. 750) 

 cc. Auricular region without any chestnut. 



d. A white superciliary stripe; crown chestnut, bordered laterally with black; 

 median under parts whitish. (Highlands of Costa Rica and Chiriqui.) 



Basilenterns melanogenys, adults (p. 751) 

 dd. No white superciliary stripe; crown not chestnut. 



e. Spot in front of eye, postocular streak, and part of auricular region black; 

 superciliary stripe and median crown-stripe pale drab; under parts pale 

 olive-yellowish. (Highlands of Costa Rica, Chiriqui, and Veragua. ) 



Basilenterns melanotis, adults (p. 752) 

 ee. No black on side of head; superciliary region olive; median crown-stripe 

 more or less yellow, sometimes partly orange-rufous or tawny; under 

 parts bright yellow. {Basileuterus culicivrynxs.) 

 /. Back, etc., grayish, more or less tinged with yellowish olive. 



g. Back, etc., darker and grayer. (Vera Cruz and Puebla, Mexico, to 



Costa Rica.) Basilenterus culicivorus culicivorns, adults (p. 753) 



gg. Back, etc., lighter, more tinged with yellowish olive. 



/(. Lateral crown-stripes broader, deeper black; median crown-stripe 

 clear lemon yellow, without olive tips to feathers. (States of 

 Guerrero and Jalisco, southwestern Mexico. ) 



Basilenterus culicivorns fiavescens, adults (p. 755) 

 hh. Lateral crown-stripes narrower, duller black; median crown-stripe 

 obscured by grayish olive tips to feathers. (States of Tamaii- 

 lipas and San Luis Potosi, northwestern Mexico.) 



Basilenterns cnlicivorus brasherii, adults (p. 755) 

 ff. Back, etc., greenish olive. (Chiriqui and Veragua.) 



Basilenterns cnlicivorus godmani, adults (p. 756) 

 hh. Pileuni concolor with back. Two narrow wing-bands of buff. (Young). 

 c. Back, etc., light brown or olive; chest buff or light olive. 

 d. A distinct supra-auricular streak of whitish; under parts more or less huffy, 

 e. Back olive; under parts pale buffy brownish, becoming nearly white on 



abdomen Basilenterns rufifrons rnfifrons, young (p. 746) 



ee. Back grayish brown; under parts entirely deep buff. 



Basilenterus rufifrons dugesi, young (p. 747) 

 dd. No whitish supra-auricular streak; under parts pale olive, the abdomen 

 pale sulphur yellowish... Basilenterus rnfifrons delattrii, young (p. 747) 

 cc. Back, etc., olive-brown or sooty; chest grayish brown or light sooty. 



Basilenterus melanogenys, young (p. 752) 

 an. Rump, tail-coverts, and at least basal half of tail buff. [BasHeuterm semiceninui.) 



