532 BIRDS OF THE REPUBLIC OF PANAMA PART 3 



singly through the forests. The only nest that he found was attended 

 by one adult. From other observations it was his impression that males, 

 keeping to a limited daily range, attracted the females by their calling, 

 but that the birds did not form permanent pairs that remained in 

 company during nesting. The nest, suspended from a twig about 

 3^ meters above the ground, was a rounded ball with the opening 

 guarded by a small projection above. It was made of "fine light- 

 colored bast fibers, which in the bottom of the cozy rounded structure 

 formed a very thick cushion." The nest was attached to the support- 

 ing twig by a broad band more than 50 mm in width, while a thin 

 streamer dangled below. The two young were attended by one 

 parent that he believed was the female. 



Schonwetter (Handb. Ool., pt. 15, 1968, pp. 83, 111) describes 

 eggs from Peru and Ecuador (listed under the nominate race L.p. 

 pileatus) as somewhat pointed miniatures of those of the Royal Fly- 

 catcher. Some have a bright to dark reddish gray ground color, 

 thickly marked with carmine in scrawling lines which form a wreath 

 or band that obscures the ground color. Others have elongated 

 carmine spots mixed with dark lines. The similarity is such as to indi- 

 cate a possible relationship between the two genera. In size six eggs 

 of the Lophotriccus measured 17.4—18x12.8-13.5 mm. 



Close similarity in size in birds from western and eastern Panama 

 is shown by comparison of the following measurements of males 

 from eastern Panama with those listed above from the western end 

 of the Republic. 



Males (10 from eastern Province of Panama and Darien), wing 

 47.1-51.8 (49.6), tail 34.7-38.7 (36.2), culmen from base 11.0-12.5 

 (11.6), tarsus 15.2-16.1 (15.8) mm. 



The range of the species as a whole extends from Costa Rica south 

 to South America through Colombia and western Venezuela to Ecua- 

 dor and Peru, where additional races have been recognized. 



ATALOTRICCUS PILARIS WILCOXI Griscom: Light-eyed 

 Pygmy-tyrant, Moscareta Pigmea Ojiblanca 



Atalotriccus pilaris zvilcoxi Griscom, Amer. Mus. Nov. no. 141, October 31, 1924, 

 p. 1. (La Colorada, near Santiago, Veraguas.) 



Very small ; pale grayish green above ; light grayish white under- 

 neath, faintly streaked with darker gray ; tail long, narrow ; eye 

 light-colored. 



Description. — Length 82-95 mm ; four outer primaries shortened, 

 narrowed, and pointed. Adult male, with the four outermost primaries 



