2.60; tail, 2.35, or less; bill, .57 and .27; tarsus, .66; middle toe, .37. Hab. Eastern Province North America, south through Eastern Mexico to Guatemala … var. flaviventris.
Dull olive-gray above, pale, somewhat ochraceous, yellow beneath; wing-bands grayish-white; lining of wing strongly tinged with fulvous. Wing, 2.75; tail, 2.60 to 2.75. Hab. Western Province of North America, south, through Western Mexico, to Colima … var. difficilis.
E. fulvipectus.[93] Bill narrow, the width but little more than the depth, and the culmen considerably more than twice the breadth at base. Outer web of lateral tail-feather distinctly whitish, very different from the dusky of the inner web. Tail deeply emarginated. Colors of flaviventris var. difficilis, but wing-bands broad and buffy olive, and a deep shade of fulvous-olive across the breast. Wing, 3.00; tail, 2.90; bill, .61 and .22; tarsus, .60; middle toe, .37. Hab. City of Mexico.
b. Grayish or greenish olive above, whitish beneath.
¶. Tail deeply emarginated.
E. obscurus. Exact form and proportions of fulvipectus, but tarsus much longer proportionally. Ashy above, with a slight olive tinge; white beneath with no yellow tinge, and without distinct ashy shade across breast; sides of breast like the back. Orbital ring, wing-markings, and outer web of lateral tail-feather pale clear ashy. Wing, 3.00; tail, 2.80; bill, .64 and .24; tarsus, .77; middle toe, .42.
E. hammondi. Very similar, but bill much smaller and less elongated. Color of upper parts the same as in obscurus; but anterior lower parts nearly uniform ashy, the throat only indistinctly paler, and the posterior portions distinctly uniform pale sulphur-yellow. Outer web of lateral tail-feather less distinctly whitish. Wing, 2.85; tail, 2.55; bill, .50 and .20; tarsus, .64; middle toe, .34.
E. minimus. Very similar to hammondi, but bill much larger, broader, and the lateral outlines less straight. Outer web of lateral tail-feather not appreciably paler than the inner; whole throat distinctly whitish; wing-bands only about half as wide as in hammondi.
Wing, 2.70; tail, 2.60; bill, .57 and .27; tarsus, .66; middle toe, .35. Hab. Eastern Province of North America, and Eastern Mexico … var. minimus.
¶. Tail doubly rounded.