FAMILY TYRANNIDAE 481 



Like the small resident Wood Pewees of the lowlands, the tail often 

 is shivered as the birds return to a perch. 



Eisenmann describes their calls as "a piping pip-pip-pip-pip vary- 

 ing in the number of notes, and occasionally uttered at a faster pace." 

 He remarks that the notes suggest those of the much larger Dark 

 Pewee, but are higher in pitch. 



Skutch (Publ. Nuttall Orn. Club, no. 7, 1967, pp. 86-90) in an 

 account of this race in Costa Rica (where in addition to its mountain 

 range it occurs at lower elevations in humid forest) found nests 

 built in pendant loops of vines, often adjacent to growths of ferns, 

 mosses, and other epiphytes. The exterior of the shallow nest cup 

 was formed of mosses gathered from nearby branches. The lining 

 was of branching lichens. In building, the female worked alone, with 

 the male resting and calling nearby. The eggs, seen by means of a 

 mirror attached to a slender stick, "were two, dull white, with a 

 conspicuous wreath of brownish white around the thicker end." The 

 male occasionally brought an insect and fed his mate, but did not 

 assist otherwise during incubation. The female on the nest kept sharp 

 watch for insects, and when one passed near, often flew directly 

 from her position on the eggs to seize it, usually returning immedi- 

 ately to her post. As the nest was inaccessible, no measurements of 

 the eggs were made. They were taken by some predator before 

 hatching. 



MITREPHANES PHAEOCERCUS VIVIDUS Griscom 



Mitrephanes aurantiiventris vividus Griscom, Amer. Mus. Nov., no. 280, Sep- 

 tember 10, 1927, p. 11. (Chitra, 1220 meters, Veraguas, Panama.) 



Characters. — Foreneck and breast slightly paler, ranging from a 

 color almost identical with that of M. p. aurantiiventris from Veraguas 

 and Code, to one definitely paler in Darien ; abdomen distinctly 

 yellowish bufif to yellow ; dorsal surface lighter green ; tarsus slightly 

 shorter. 



The markings of the lower surface show a cline from darker in 

 Veraguas and Code to paler eastward on Cerro Tacarcuna. 



A male collected on Cerro Mali, Darien, March 1, 1964, had the 

 iris dark brown ; maxilla black ; mandible honey yellow ; tarsus and 

 toes fuscous-black ; claws black ; gape and inside of the mouth, in- 

 cluding the tongue, honey yellow. 



A female from this locality, taken on March 16, was similar. 

 Another female from the head of the Rio Guabal, Code, March 3, 



