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BIRDS OF THE REPUBLIC OF PANAMA PART 4 



The song is varied and clear, with final phrases like the loud trilling 

 of a domestic canary. Skutch (Pac. Coast Avif., no. 31, 1954, p. 348) 

 found that the female sings a rich warble in response to the song of the 

 male. This species sings more or less throughout the year, but most 

 during the nesting season; the song is usually delivered from the ground 

 or a rock or log in a stream. Eisenmann describes the song as explo- 

 sive, emphatic, and loud (usually increasing toward the end), with 

 notes in rapid succession often given from a perch, 5-3 m above the 

 ground, above or near a stream. On April 12 and 16, 1959, he wrote 

 songs as chewy, chewy, chee-chee-chee-chee-chee-chee- , choo, choo, 

 choo, choo-choo-choo-choo , tyoo, tyoo. The song lasted 4-6 seconds; 

 the numbers of chee and other notes varied, and the tyoo notes might be 

 omitted. The call is a loud, sharp note or a series of such notes. 



The stomach of 1 collected by E. A. Goldman at Cana, Darien, con- 

 tained bits of two dragonflies 20%, fragments of an ant 10%, an 

 ichneumon 5%, dipteran remains finely ground 54%, fragments of a 

 cerambycid 5%, bits of two other beetles 6%. 



BASILEUTERUS FULVICAUDA LEUCOPYGIUS Sclater and Salvin 



Basileuterus leucopygius P.L. Sclater and Salvin, 1873, Nomen. Av. »Neotrop., 



pp. 10, 156. (Costa Rica.) 

 Basileuterus [leucopygius subsp. a] veraguensis Sharpe, 1885, Cat. Birds. Brit. 



Mus., 10, p. 403. (Paraiso Station, Panama.) 

 Basileuterus fulvicauda gaffneyi Griscom, 1927, Amer. Mus. Novit., no. 280, p. 14. 



(Guaval. Rio Calovevora, . . . Veraguas, Caribbean slope, western Panama.) 

 Basileuterus fulvicauda toddi Griscom, 1927, Amer. Mus. Novit., no. 280, p. 14. 



(Boqueron, Chiriqm, western Panama.) 



Characters. — Undersurface mottled and smudged with dark olive; 

 upper surface and cheeks darker; superciliary obscure; dark areas of 

 tail, particularly the outer rectrix, more extensive. 



A male collected at Puerto Armuelles, Chiriqui, March 8, 1966, had 

 the iris dark brown; base of mandible very dull dark brown; rest of bill 

 black; inside of mouth pale bluish gray; tarsus and toes brown; claws 

 dull slate. 



Measurements. — Males (10 from western Panama), wing 61.0-66.9 

 (64.4), tail 50.0-55.7 (52.4), culmen from base 12.7-14.9 (14.1), tarsus 

 21.3-22.9 (22.2) mm. 



Eemales ( 10 from western Panama and Costa Rica) , wing 60.4-65.5 

 (62.7), tail 47.1-54.6 (51.2), culmen from base 12.8-14.5 (13.8), tar- 

 sus 19.0-22.6 (21.3) mm. 



Resident. Uncommon to fairly common along streams and rivers 



