4. T. swainsoni.

Greenish-olive above, breast and sides of head strongly

tinged with buff. Spots on breast broad, distinct, nearly

black. Length, 7.00; wing, 3.90; tail, 2.90; culmen, .65;

tarsus, 1.10. _Hab._ Eastern and Middle Provinces of North

America. North to Slave Lake, south to Ecuador, west to

East Humboldt Mountains … var. _swainsoni_.

Brownish-olive above, somewhat more rufescent on wing;

breast and head strongly washed with dilute rufous. Spots

on breast narrow, scarcely darker than back. Wing, 3.85;

tail, 3.00; culmen, .70; tarsus, 1.10. _Hab._ Pacific

Province of United States. Guatemala … var. _ustulatus_.

C. Above olivaceous, becoming abruptly more reddish on upper

tail-coverts and tail. Spots as in _swainsoni_, but larger and

less transverse,—more sharply defined. An orbital ring of pale

buff. Nest on ground; eggs blue, probably unspotted.

A History of North American Birds; Land Birds; Vol. 1 of 3 · 第 41 / 438 题