86 
NORTH AMERICAN BIRDS. 
North America, and south, along the Rocky Mountains, through Mexico, 
to Costa Rica. ( Olive-sided Flycatcher.') 
b. Rictal bristles strong (one half, or more, the length of the bill). Cottony 
patch imperfectly developed, concealed; lower parts not distinctly white 
medially. 
2. C. pertinax. Above grayish-olive ; beneath similar, but somewhat 
lighter, and paler on the throat and abdomen. Wing, 4.45 ; tail, 3.90 ; 
culmen, .92 ; tarsus, .70. Hab. Mexico generally, north into southern 
borders of United States (Fort Whipple, Arizona, Coues). (Cones' s 
Flycatcher). 
B. Wing less than 3.50 long. 
3. C. virens. Above grayish-olive, the wings and tail darker ; beneath 
grayish- white. Wing, about 3.40; tail, 2.65 to 2.90; culmen, .65 to 
.70 ; tarsus, .54 to .56. .L, 
Whitish of the medial lb^er parts not interrupted across the breast. 
Hab.- Eastern Province ©f North America. ( Wood Pewee.) var. virens. 
Whitish of the medial lower parts interrupted by a grayish wash 
across the breast. (Richardson's Pewee.) . , var. ricliar dsoni. 
Genus EMPIDONAX, Cabanis. (Page 83.) 
A. Tail even, or slightly rounded. : 
a. Young with the upper parts transversely mottled with paler. 
1. E. acadicus. Grayish-green above ; wing-bands pale buff (in the | 
adult!); upper mandible brown. Wing, 3.10; tail, 2.50; culmen, .67; i 
breadth of bill, .30 ; tarsus, .60 ; middle toe, .34. Hab. Eastern Prov- 
ince of United States, and Eastern Mexico. (Green-crested Fly- 
catcher.) 
b. Young not mottled above. 
2. E. pusillus. Olive-gray, or brownish-olive above ; wing-bands 
olive or gray (buff in the young) ; upper mandible black. v 
Olive-gray above, the wing-bands much lighter, or whitish-gray. I 
Wing, 2.90; tail, 2.70; culmen, .69; breadth of bill, .26; tarsus, 
.67 ; middle toe, .40. Hab. Western Province of North America, 
and Western Mexico. (Little Flycatcher.) . . var .pusillus. \ 
Brownish-olive above, the wing-bands scarcely paler. Wing, | 
2.90; tail, 2.50; culmen, .64; breadth of bill, .27 ; tarsus, .66; middle 
toe, .38. Hab. Eastern Province of North America, and Eastern 
Mexico. (Traill's Flycatcher.) var. trailli. \i 
B. Tail more or less emarginated. 1 
b. Olive-green above, yellowish beneath. 
3. E. flaviventris. 
Clear olive-green above, sulphur-yellow beneath; wing-bands 
greenish-yellow. Tail nearly even. Wing, 2.60 ; tail, 2.35, or less; 
culmen, .57 ; breadth of bill, .27 ; tarsus, .66; middle toe, .37. Hab. ? . 
Eastern Province of North America, south to Guatemala. (Yelloiu- 
bellied Flycatcher.) var. flaviv entris. 
Dull olive above, ochraceous-yellow beneath ; wing-bands grayish- 
white. Tail deeply emarginated. Wing, 2.75 ; tail, 2.60 to 2.75. 
Hab. Western Province of United States, and Western Mexico. 
( Western Flycatcher.) var. d iff i c Hi s. 
b. Olive-gray, or grayish-olive, above, whitish beneath. | 
