FAMILY TYRANNIDAE 



423 



Two very slightly dififerent subspecies are included in these migrant 

 visitors from the north, one averaging faintly darker. The differences 

 are evident in the extreme examples but with intergradation through 

 which allocation of numerous individuals is difficult. All may be 

 identified only from comparison of specimens in hand. 



They range through the lowlands, except that few are found in the 



Figure 38. — Great crested flycatcher, cabezota de paso, Myiarchus crinitus. 



savanna areas toward the sea on the Pacific slope. On the Azuero 

 Peninsula they are found mainly on the western side and the southern 

 end, more rarely on the eastern side where I recorded single birds in 

 gallery forest on the Rio Escota near Santa Maria, Herrera, on March 

 8 and 9, 1948, and one near Pese, Herrera, on March 24 following. 

 In fall flight the early records are September 11, 1965 (Eisen- 

 mann and Willis) and September 20, 1961 (Willis), with the birds 

 common through October and November. While many appear to 



