74'2 BULLETIN oO, UNITED STATES NATIONAL MUSEUM. 



/. Auricular U'iiioii witli ouly tlic ujiin'r half chestnut, the lower half 

 whitinh. 

 g. Ilindneck and sides of neck gray; posterior under jiarts sometimes 

 partly whitish. (Southern Vera Cruz to (iuatemala.) 



Basileuterus rufifrons flavigaster, adults (p. 748) 

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

 without any whitish. ( Highlands of Guatemala. ) 



Basileuterus rufifrons salvini, adults (p. 749) 

 ff. Auricular region entirely chentinit. 



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

 (Nicaragua and Costa Rica.) 



Basileuterus rufifrons delattrii, adults (p. 749) 

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

 (Colombia, north to C'hiriqui. ) 



Basileuterus rufifrons mesochrysus, 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. ) 



Basileuterus melanogenys, adults (p. 751) 

 (Id. 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 dral); undei' parts pale 

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



Basileuterus 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 yello\V. ( BasilcKlems culidvorus. ) 

 f. Back, etc., grayish, more or less tinge<l with yellowish olive. 



g. Back, etc., darker and grayer. ( Vera Cruz and Puel)la, Mexico, to 



Costa Rica.) Basileuterus culicivorus culicivorus, adults (p. 758) 



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.) 



Basileuterus culicivorus flavescens, adults (p. 755) 

 /(/(. Lateral crown-stripes narrower, chiller 1)lack; median crown-stripe 

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

 lipas and San Luis Potosi, northwestern .Mexico.) 



Basileuterus culicivorus brasherii, adults (}). 755) 

 ff. Back, etc., greenish olive. (('hiri(|ui and \'eragua.) 



Basileuterus culicivorus godmani, adults (p. 75t)) 

 hli. I'ileum concoior with back. Two narnnv wing-bands of buff. (Young). 

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



(/. A distinct supra-auricular streak of whitish; under parts more or less buffy. 

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



abdomen Basileuterus rufifrons rufifrons, young {]>. 7-JG) 



ee. Back grayish brown; under ))arts entirely deep l>uff. 



Basileuterus rufifrons dugesi, young (p. 747) 

 (Id. No whitish sujira-auricular streak; under parts pale olive, the abdomen 



pale sulphur yellowish Basileuterus rufifrons delattrii, young (p. 747) 



cc. Back, etc., olive-brown or sooty; clu'st grayish brown or light sooty. 



Basileuterus melanogenys, j^oung (p. 752) 

 au. Rump, tail-coverts, and at least l)asal half of tail buff. (Ba.sikitlerus semicervmus.) 



