364 NORTH AMEBIC AN BIRDS. 



2.60 ; tail, 2.35, or less ; bill, .57 and .27 : tarsus, .66 ; middle toe, 

 .37. Hah. Eastern Province North America, south through East- 

 ern Mexico to Guatemala ..... \?iv. flaviv entris . 



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. Hah. Western Province 

 of North America, south, through Western Mexico, to Colima. 



var. difficilis . 

 E. fulvipectus.* 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 

 o^ flaviventris var. difficilis, but wing-bands broad and bufify 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. Hah. City of Mexico. 

 6. Grayish or greenish olive above, whitish beneath. 



IF. Tail deeply emarginated. 



C obscurus. Exact form and proportions of fulvipedus, 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 ohscuriis ; 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. Hah Eastern Province of North America, and Eastern 

 Mexico ......... var. minimus. 



IT, Tail doubly rounded. 



Wing, 2.35 ; tail, 2.20 ; bill, .54 and .25 ; tarsus, .62 ; middle toe, 

 .33. Colors of minimus, but wing-markings whiter. Hah. 

 Panama {\q,v.1) pectoralis.^ 



1 Empidonax fulvipectus, Lawr. Ann. N. Y. Lye. Feb. 1871, 11. (Type examined.) A very 

 distinct species, most nearly related to obscurus, from which it differs totally in color and in 

 much shorter tarsus. 



2 Empidonax minimus, var. pectoralis. Empidonax pectoralis, Lawr. It seems but reason- 

 able to consider this bird as the southern race of minimus, as the differences — i. e. smaller size 

 and whiter wing-bands — are just what we find in several other species of the same region, 

 compared with allied and probably co-specific northern types, — as griseigularis and acadicus, 

 southern specimens of trailli var. j^usillus in which the wing-bands are much whiter than in 

 northern specimens of the same bird. 



