TYEANNID^ — THE FLYCATCHERS. 365 



E. griseipectus.' Colors of hammondi, but wing-bands whiter and 

 narrower, very sharply defined; sides tinged with clear greenish; 

 jugulum and sides of throat clear ashy. Wing, 2.40 ; tail, 2.40 ; bill, 

 .56 and .27 ; tarsus, .60 ; middle toe, .35. Hab. Guayaquil, Ecuador. 



1". Tail square, or slightly rounded ; feathers acute at tips. 

 E. pusillus. Brownish-oUve or olive-gray above, wing-bands olive 

 or gray ; beneath whitish, with a grayish shade across the breast, and 

 a sulphur-yellow tinge posteriorly. 



Olive-grayish above, wing-bands much lighter, or whitish-gray. 

 Wing, 2.90 ; tail, 2.70 ; bill, .69 and .26 ; tarsus, .67 ; middle toe, 

 .40. Hab. Western Province of North America, and Middle 



and Western Mexico y&v pusillus. 



Brownish-olive above, wing-bands but little lighter. Wing, 2.90 ; 

 tail, 2.50 ; bill, .64 and .27 ; tarsus, .66 ; middle toe, .38. Hah. 

 Eastern Province of North America, and Eastern Mexico . var. trailli. 



§. Young with upper plumage transversely mottled. Wing-bands with a 



pale buff tinge ; upper mandible brown. 

 E. acadicus. Grayish-green above, greenish-white beneath ; throat 

 purer white. Wing, 3.10; tail, 2.80; bill, .67 and .30; tarsus, .60; 

 middle toe, .34. Hab. Eastern Province of United States, and Eastern 

 Mexico .......... va,T. a cadicus. 



Wing, 2.65 ; tail, 2.50 ; bill, .66 and .30 ; tarsus, .62 ; middle toe, 

 .33. Wing-bands whiter. Hab. Panama . var. griseig ul arts .^ 



In Umpidonax, as well as Contopus, aittnmnal birds have the plumage 

 softer and the colors brighter than in spring ; the brilliancy of the yellow 

 shades is especially enhanced. The young of the year resemble the parents, 

 but there is a greater tendency to light bands on the wings, which with the 

 other markings of this region show an ochraceous tinge. The lower mandi- 

 ble is also usually tinged with dusky. In the young of E. acadica, alone, 

 there are light transverse bars over upper surface, as in the young of some 

 species of Contopus (C. bahamensis and C. punensis). 



1 Empidonax griseipectus, Lawr. May possibly be another seasonal plumage of the same 

 species as pedoralis, but differs in some seemingly important respects. 



2 Empidonax acadicus, var. griseigularis. Emiiidonax griscigularis, Lawr. Differing from 

 acadicus only in smaller size and whiter wing-bands. 



The remaining described American species of Empidoimx, which we have not seen, are the 

 following : — 



Empidonax inagnirostris, Gould, Voy. Beagle, pi. 8. — Gray, Hand List. 



Empidonax albigularis, Sclater & Salvin, Ibis, 1859, p. 122 (Orizaba). — Sclater, Catal. 

 Am. B. 1862, 229. This may possibly be the species described above as E. axillaris. 



