FAMILY TYRANNIDAE 567 



Ecuador, dififers in the male in being lighter gray, with the white 

 markings on the wing more extensive. The female has the breast, 

 sides, and abdomen paler yellow. Size in the two races is similar, as 

 indicated by measurements of two males and a female paramhae in 

 the Academy of Natural Sciences in Philadelphia from the Rio 

 Jurubida. Choco, Colombia, and the type male, in the American 

 Museum of Natural History from Paramba, Esmeraldas, Ecuador. 



Males, wing 54.8-55.4 (55.1). tail 45.0-46.4 (45.8), culmen from 

 base 9.5-10.0 (9.7), tarsus 14.5-15.6 (15.0) mm. 



Female, wing 54.2, tail 44.9, culmen from base 10.0, tarsus 15.8 mm. 



CAMPTOSTOMA OBSOLETUM (Temminck) : Southern 

 Beardless Flycatcher, Monona Lampina 



Muscicapa obsoleta Temminck, Nouv. Rec. Planch. Col. Ois., livr. 46, May 

 1824, pi. 275, fig. 1. (Curitiba, Parana, Brazil.) 



Very small ; grayish green above ; pale yellow below, with two, 

 white wing bars ; bill small ; often active like a small wood warbler. 



Description. — Length 85 to 95 mm. Adult (sexes alike), above 

 rather dull grayish green, with a faintly darker crown ; a narrow white 

 eye-ring, and an indistinct white line from lores back above eyes ; 

 cheeks lined indistinctly with white ; wings dusky, with the middle 

 and greater coverts tipped with white to pale yellowish white, to form 

 two distinct wing bars ; in some, light tips on the lesser coverts form 

 a third bar ; tertials tipped with yellowish white ; secondaries and 

 primaries edged narrowly with yellowish white ; tail fuscous to dusky, 

 tipped with dull bufify white ; throat and upper f oreneck rather dull 

 white ; rest of under surface light yellow to very pale yellow, duller 

 and grayer on upper breast and sides ; axillars, under wing coverts, 

 and edge of wing light yellow. 



Juvenile, slightly duller, browner, above, with rump and upper tail 

 coverts buffy brown ; wing bands dull cinnamon-buff ; under surface 

 very pale buffy white, with a narrow indistinct band of buff across 

 the breast. In their mainland range in Panama they are fairly uniform 

 in coloration. In addition, two slightly marked island races have 

 been described. 



The species as a whole is found from Costa Rica and Panama 

 through tropical South America to northern Argentina and southern 

 Brazil. 



While these flycatchers are common locally, they may be overlooked 

 because of their tiny size, as any leaf is sufficient cover to conceal 

 them. 



