TYRANNID^ — THE FLYCATCHERS. 305 



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

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

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

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



IT. Tail square, or sliijhthj rounded ; feathers acute at tips. 

 E. pusUlus. Brownish-olive 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 whitisli-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 ....... var pusillu s . 



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

 tail, 2.50 : bill, .64 and .27 ; tarsus, .60 ; middle toe, .38. Hab. 

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



§. Yoking with upper plumage transversely mottled. Wing-bauds icith 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 . . . . . . . . . . \'!)X. acadic u s. 



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

 .33. Wing-bands whiter. Hab. Panama . var. gr i seigul a r is .^ 



a 



In Empidonax, as well as Contopns, autumnal liirds liave 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 Conto2n'.s (C. hahamensis and C. punmsis). 



' Empidonax griseipcdus. Lawk. May possibly be another seasonal plumage of the same 

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



^ Empidonax acadicus, var. griscigularis. Emjndonax griscigularis, Lawr. Differing from 

 aaidicus only in smaller size anil whiter wing-bands. 



The remaining described American species of Empidomix, wliich we have not seen, are the 

 following : — 



Empidonax macfnirostrls, Gould, Voy. Beagle, pi. 8. — Gr.\t, Hand List. 



Empidonax albigularis, Sclatep, & Sai.vix, Ibis, 18.59, p. 122 (Orizaba). — ScLATEK, Catal. 

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



