FAMILY TYRANNIDAE 433 



Females ( 10 from Code, Province of Panama, Canal Zone, eastern 

 Colon, Darien. and San Bias), wing 73.3-76.1 (74.5), tail 65.6-71.4 

 (67.7), culmen from base 18.1-20.3 (19.1), tarsus 18.^19.9 

 (19.1) mm. 



Resident. Common and widely distributed through the Tropical 

 Zone, on the Pacific slope from the western sector of the Province of 

 Panama east through Darien ; on the Caribbean side from the valley 

 of the Rio Indio in the western sector of the Province of Colon and 

 northern Code east through the Canal Zone and the Comarca de 

 San Bias to the Colombian boundary ; to above 900 meters on Cerro 

 Campana, 875 meters on Cerro Azul, 600 meters on the base of Cerro 

 Tacarcuna and above Cana on Cerro Pirre. 



Nesting appears to begin in March and April. On April 9, 1946, 

 at Jaque, Darien I found a pair in breeding condition. The following 

 year, farther inland on the upper Rio Jaque in the same week, one at 

 our camp gathered stray feathers for nest lining. March 9, 1950, on 

 Cerro Chucanti, eastern Province of Panama, one carried nesting 

 material. At the old village site on the upper Rio Tacarcuna, March 

 17, 1964, one gathered feathers from the playon in front of our 

 camp and carried them to a tree cavity 10 meters above the ground. 

 On March 21 following, at El Real, Darien, one brought nest material 

 to a hole in a stub. 



Stomachs of this race that I have examined have contained frag- 

 ments of cicadas, several kinds of hemiptera, bits of an adult lepidop- 

 teron, ants and other hymenoptera, mixed usually with seeds from 

 small berries. 



As already stated, while not overly belligerent as a rule, once in 

 eastern Darien I found several in high open tree tops being violently 

 antagonistic to the many migrant Bay-breasted Warblers that moved 

 with wings and tails flitting through the trees. Whenever these 

 warblers appeared, the flycatchers drove at them, but in contrast paid 

 no attention to numerous small native birds resting quietly near them 

 in the same trees. 



SIRYSTES SIBILATOR ALBOGRISEUS (Lawrence): Sirystes, 

 Papamoscas Copeton 



Figure 39 



Lipaugus albogriscus Lawrence, Ann. Lye. Nat. Hist. New York, vol. 8, May 

 1866, p. 9. (Lion Hill, Canal Zone, Panama.) 



Medium size ; black crown, wings and tail ; rump and under surface 

 grayish white. 



