FAMILY TYRANNIDAE 473 



there appear to be two forms in Mexico, with one of them ranging 

 south to Guatemala. A third subspecies is found from Honduras to 

 Panama. Under present understanding these three subspecies may 

 be recognized as follows : 



Empidonax albigularis albigularis Sclater and Salvin. 



Empidonax albigularis Sclater and Salvin, Ibis, vol. 1, no. 2, April 1859, 



p. 122. (Dueiias, Guatemala.) 

 Empidonax axillaris Ridgway, in Baird, Brew^er, and Ridgway, History of 



North American Birds, Land Birds, vol. 2, January 1874, p. 363 (in Key). 



(Orizaba, Mexico.) 



Somewhat browner above, and in the breast band ; averaging paler 

 throughout. 



Measurements. — Males (1 from Guatemala, 6 from Orizaba, 

 Mexico), wing 59.2-63.4 (61.2), tail 52.9-57.2 (54.8), culmen from 

 base 13.6-14.8 (14.1), tarsus 15.5-16.8 (16.0) mm. 



Females (2 from Orizaba, Mexico), wing 57.5, 58.9; tail 51.3, 

 53.7; culmen from base 14.2, 14.3; tarsus 16.2, 16.5 mm. 



Eastern Mexico to Guatemala. 



Empidonax albigularis timidus Nelson 



Empidonax timidus Nelson, Auk, vol. 17, no. 3, July 1900, p. 263. (El Salto, 



Durango, Mexico.) 



Brown like E. a. albigularis, but paler. 



Measurements, male (type), wing 61.7, tail 54.7, culmen from 

 base 13.3, tarsus 16.5 mm. 



Northwest Mexico. 



Empidonax albigularis australis Miller and Griscom 



Empidonax albigularis australis Miller and Griscom, Amer. Mus. Nov. no. 159, 



February 16, 1925, p. 5. (San Rafael del Norte, Nicaragua.) 



Somewhat darker, more olive in general coloration ; dorsal surface 

 darker ; breast band slightly more olive. 



Honduras through Nicaragua and Costa Rica to the highlands of 

 Chiriqui ; accidental in the Canal Zone. 



For measurements, see above. 



EMPIDONAX ALNORUM Brewster: Alder Flycatcher, 

 Moscareta Verdusca 



Empidonax traillii alnorum Brewster, Auk, vol. 12, April 1895, p. 161. (Upton, 



Maine.) 



Small ; throat white ; a slightly indicated dark band across the 

 breast ; larger than the Least Flycatcher, Empidonax minimus, with 

 white eye-ring narrower, less evident. 



