Mr. R. Ridgway on the Genus Empidonax. 467 



across breast and aloug sides with 

 olive-g-reeii ; edge of wing clear 

 sulphur-yellow. Wing 2-50-2-90 

 (2-75) inches, tail 2-15-2-6o 

 (2-44), culmen 0-60-0-63 (0-61), 

 width of bill at base 0-28-0'30 

 (0-20), tarsus 0-68-0-72 (0-70).— 

 Hah. Highlands of Guatemala . . E. salvini. 

 i^. Above bright greenish olive (vary- 

 ing to tawny olive), the wing- 

 bands more ochraceous ; lower 

 parts bright sulphur-yellow, 

 faintly shaded across breast with 

 tawny olive ; edge of wing vary- 

 ing from light saftron-yellow to 

 deep ochraceous buff. "Wing 2-25- 

 2-70 (2-48) inches, tail 2-05-2-40 

 (2-22), culmen 0-53-0-61 (0-59), 

 width of bill at base 0-29-0-32 

 (0-30), tarsus 0-63-0-70 (0-65).— 

 Hob. Costa Rica, Veragua, and 



Chiriqui E.Jlavescem. 



'. Width of bill at nostrils less than half the length of 



the exposed culmen. 

 6'. Outer web of outer tail-feather not abruptly paler 

 than inner web : culmen 0'55 inch or less ; tarsus 

 less than 0'70. 

 Above olive, usually more greyish anteriorly, espe- 

 cially on hind neck ; wing-bands dull light 

 olive-greyish; lower parts varying from dull 

 greyish white, faintly tinged posteriorly wdth 

 sulphur-yellow, to decided olive-yellowish, the 

 breast always strongly shaded with olive or olive- 

 greyish, the throat never distinctly whitish. 

 Male : Wing 2-60-2-80 (2-72) inches, tail 2-30- 

 2-50 (2-38), culmen Ov'JS-O-SO (0-56), width of 

 bill at base 0-22-0-24 (0'23), tarsus 0-60-0-68 

 (0-63). Female: Wing 2-45-2-75 (2-61), tail 

 2-15-2-40 (2-25).—Jlab. Western North Ame- 

 rica, north to Lesser Slave Lake, south, in 



winter, to Southern Mexico E, hammondi. 



b^. Outer web of outer tail-feather abruptly paler than 

 the inner weh (usually distinctly dull whitish) : 

 culmen 58 inch or more ; tarsus usually more 

 than 0-70. 



