478 BIRDS OF THE REPUBLIC OF PANAMA — PART 3 



Others of this form, all males, from northern Colombia, include 

 one from Punto Muchimbo, on the lower Rio San Juan, Valle, 

 January 11, 1951, two from Regeneracion, Bolivar, February 10, 

 1948, and one from Nazaret, eastern Guajira, April 29, 1941. 



EMPIDONAX TRAILLII ADASTUS Oberholser 



Empidonax traillii adastus Oberholser, Sci. Publ. Cleveland Mus. Nat. Hist., 

 vol. 4, no. 1, September 19, 1932, p. 3. (Hart Mountain, northern end of 

 Warner Valley, 20 miles northeast Adel, Oregon.) 



Definitely grayer than brewsteri, slightly darker throughout than 

 extimus. 



Measurements. — Males (8 from Oregon, Idaho, Montana, and 

 Utah), wing 67.7-72.0 (69.9), tail 54.8-60.0 (57.4), culmen from base 

 14.5-17.9 (15.8), tarsus 16.4-16.9 (16.5) mm. 



Females (8 from Oregon, Idaho, and Utah), wing 65.2-69.0 (67.3), 

 tail 53.9-58.6 (55.9), culmen from base 14.2-16.1 (15.2), tarsus 

 16.0-16.7 (16.4) mm. 



Migrant from the north ; fairly common as a winter resident in the 

 lowlands ; one record at 600 meters elevation on Cerro Pirre. 



This form, recorded from September to April throughout the low- 

 lands of Panama, is fairly common through the winter season. I have 

 found it in undergrowth, usually near streams. One from Cerro 

 Pirre, Darien, is a female taken by E. A. Goldman in second growth 

 jungle, March 23, 1912. 



The Carriker collections from northwestern Colombia include two 

 females from Rio Viejo, February 20 and 23, and male and female 

 from Norosi March 10 and 13, 1947, all in the Department of 

 Bolivar ; and a female from Pueblo Nuevo, Cordoba, January 22, 

 1949. 



EMPIDONAX TRAILLII EXTIMUS Phillips 



Empidonax traillii extimus Phillips, Auk, vol. 65, no. 4, October 22, 1948, p. 512. 

 (Feldman, lower San Pedro River, Arizona.) 



Definitely close in hue to adastus but paler ; lightest in dorsal color 

 of the races. 



Measurements. — Male (1 from New Mexico), wing 70.4, tail 62.6, 

 culmen from base 15.5, tarsus 16.5 mm. 



Females (6 from Arizona and New Mexico), wing 63.6-69.2 

 (67.1), tail 53.1-58.3 (56.3), culmen from base 14.6-16.0 (15.5), 

 tarsus 16.1-17.0 (16.4) mm. 



