1. T. mustelinus. Beneath nearly pure white, with rounded blackish spots over the whole breast, sides, and upper part of abdomen; wing, 4.25; tail, 3.05; culmen, .80; tarsus, 1.26. Hab. Eastern Province United States, south to Guatemala and Honduras. Cuba and Bermuda of West Indies.
2. Spots beneath triangular, on breast only.
B. Entirely uniform in color above,—olivaceous, varying to reddish or greenish with the species. Beneath whitish, with a wash of brownish across the breast and along sides. Spots triangular, and confined to the breast. Nest on trees or bushes; eggs blue spotted with brownish; except in T. fuscescens, which nests on the ground, and lays plain blue eggs.
a. No conspicuous light orbital ring.
2. T. fuscescens. Yellowish-rufous or olive-fulvous above; a strong wash of pale fulvous across the throat and jugulum, where are very indistinct cuneate spots of same shade as the back. Wing, 4.10; tail, 3.00; culmen, .70; tarsus, 1.15. Hab. Eastern Province of North America. North to Nova Scotia and Fort Garry. West to Great Salt Lake. South (in winter) to Panama and Brazil. Cuba.
3.
T. aliciæ. Grayish clove-brown above; breast almost white, with broad, blackish spots; whole side of head uniform grayish. Wing, 4.20; tail, 3.20; culmen, .77; tarsus, 1.15. Hab. Eastern Province North America from shore of Arctic Ocean, Fort Yukon, and Kodiak to Costa Rica. West to Missouri River. Cuba.
b. A conspicuous orbital ring of buff.
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.