FAMILY TYRANNID^E 



d. White concealed crown patch with feathers 

 each side erectile, forming a pointed 

 double crest; characteristic common call 



of lisping whistles 



Genus Elcenia, (see description) 



dd. No concealed crown patch or elongated 



double crest 



Genus Empidonax, (see description) 



cc. Darker and more brownish above; two darker 

 and less distinct wing bars; no whitish eye 

 ring .... Genus Myiochanes, (see description) 



bb. Very small, length not over 98 mm. (3.80 in.); 

 greenish olive or light olive green above. 



c. Very minute; bill long and flat; head light olive 



green; two yellowish wing bars 



Atalotficcus pilaris -wilcoxi 



cc. Of stouter build; bill short and stout; crown 

 dark gray; wings with yellow margins, but 

 no bars Tyranniscus vilissimus parvus 



VI. Throat and breast gray; abdomen pale yellow. 

 a. Large, length not under 187 mm. (7.40 in.). 



b. Stout; bill heavy; gray with olive tinge above, a 

 dusky band through sides of head; throat 

 whitish Tyrannus melancholicus chloronotus 



bb. Bill narrower; olive above; throat gray like breast. 



c. Inner webs of tail feathers and outer margins 



of longest wing quills chestnut 



Myiarchus crinitus 



cc. No rufous on wings or tail ; no conspicuous wing 

 bars Myiarchus ferox panamensis 



aa. Smaller or very small. 



b. Length about 145 mm. (5.70 in.); whole top of 



head sooty black 



Myiarchus tuberculifer brunneiceps 



bb. Smaller, top of head not sooty black. 

 c. Length about 135 mm. (5.30 in.). 



d. Olive green above; crown grayish brown with 

 a large concealed yellow patch; sides of 

 head streaked. . Myiopagis viridicata pattens 



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